This works with sailboat sails that overlap. It called the slot effect. When adjusted properly, the first sail can push more wind onto the second sail and gain a lot of power. Some boats have three overlapping sails. The distance between and the angle is critical for better performance
@MrZriael
Жыл бұрын
I assume tuning the distance and angle properly is highly dependent upon wind speed?
@colrodrick8784
Жыл бұрын
@@MrZriaeli don’t think so. The usual wind speeds where a regular Bermuda rigged sailboat / yacht is used are anything under say 30knots (60km/hr approximately). The slot effect is apparent at all times until the wind gets up there. Beyond 20 knots most sailors are interested in survival or comfort not additional speed
@MrZriael
Жыл бұрын
@@colrodrick8784 That’s promising, would make it a lot easier to optimise…
@LG-ct8tw
Жыл бұрын
@@MrZriael It's more a function of aparent wind angle or in aerospace speak, angle of attack.
@JakMang
Жыл бұрын
@@MrZriael you are correct. It is kind of an art to learn each boat.
@ibme8359
Жыл бұрын
Amazing!!!, Perhaps a third blade set could be added to "The stack" and increase the performance more (probably need to change the spacing and the angle offset proportionately for the new stack). I for one am going to tinker with a 3 stack version! Thanks for the inspiration!!!
@JaceFuse
Жыл бұрын
There's a product called XTC-3D, which is a self smoothing epoxy coating for 3D printed objects. I think you might find it useful for things like this.
@ThinkingandTinkering
Жыл бұрын
nice tip mate - thanks for sharing
@colrodrick8784
Жыл бұрын
I use a lot of epoxy in my boat projects. Their major disadvantage is UV exposure. Unless you coat the coating they will break down (eventually). Since the wind turbine is going to be used outdoors that product may not be ideal for the purpose required. I was also thinking epoxy during the video, then I thought, but wait - UV. As you can imagine UV is a huge issue in Oz.
@donmcnish3918
Жыл бұрын
Would love to see performance on a graph wind speed/torque produced. For 3/6 winged blades. I find your videos thought provoking. Keep them up. Kind regards Don
@andrewsmithmilan1780
Жыл бұрын
@@colrodrick8784could you maybe spray a light coat of light colored spray paint to cover the epoxy and protect it from UV?
@gerryjamesedwards1227
8 ай бұрын
@@andrewsmithmilan1780 some of the paints intended for marine use protect from UV damage. They are expensive if you're painting boats with them, but even a half-liter would coat a lot of turbine blades.
@piotrjasielski
Жыл бұрын
I'd love to see an analysis on how this actually works with higher effciency.
@huarwe8797
Жыл бұрын
Would be nice with some smoke and a slow motion camara to see the vortexes.
@mark.guitar
Жыл бұрын
Great shout!
@stewartj00701
Жыл бұрын
I've done quite a bit of sailing in my time, and this seems something like the effect you get when you get the optimum slot between the mainsail an the jib, once the slot is too tight it kills the speed, the centre of balance of the rig needs moving forward to give a wider slot, too wide and you lose the effect, one wing turbo charges the second, the jib it rams air around the back of the mainsail at the right angle increasing the efficiency beyond the sum of both sails, they act as one. The big issue with wind turbines is controlling the power, we need improvements in micro wind, mechanical blade feathering systems.
@TerrorTubbie666
Жыл бұрын
So, actually, what you're saying is: The front rotor could be much smaller than the back rotor. This will not only save material, but also increase efficiency???
@TerrorTubbie666
Жыл бұрын
Do you know of anybody ever experimenting with 3 stages? Like a jib, mainsail and even bigger sail? Or a mini-jib in front of the jib? Would that work?
@stewartj00701
Жыл бұрын
@@TerrorTubbie666 quite possibly, there could be room for allot of optimization with this with pitch, blade shape, size and position, it does look like it could be some sort of slot effect
@OldManSparkplug
Жыл бұрын
I think you've got the idea exactly, and I completely agree that once we get really high rotations speeds feathering is going to be extremely necessary.
@TerrorTubbie666
Жыл бұрын
But this feathering system already exists in some aeroplane-rotors. A system with springs and centrifugal weights makes the blades turn depending on the rotorspeed. When idling, the rotor turns (relatively) slow, so the blades are flat, generating no thrust. When giving it more throttle, the rotor speeds up, so the blades turn, generating thrust. This system pretty much guarantees you will never blow up the engine by making too many rpm, cause the blades will slow it down by going to an insane angle. And it can act more or less as a break, because going back to idle at high airspeed, will set the blades flat, slowing down the plane. But I guess the problem is: This aeroplane-system is a linear system, the faster the rotor turns, the steeper the blades. While in a windturbine, we are persuing an optimal rotationspeed. We don't want it to turn too fast or too slow. Uuuhhm... Damn, I don't know how to explain exactly (in English). Maybe someone else can finish this story??? Added: Other problem: We have no throttle lever to control the system. We are dependent on the windspeed. So, uuuhhm...
@prodiver7
Жыл бұрын
Huge amounts of work were done more than 100 years ago on the efficiency of fans blowers and turbines. Somewhere I have books on this. To extract the maximum energy from a wind flow axial blades need to have maximum area furthest away from the hub: power= torque x rpm. Check out the old US ranch windpumps with many blades widest at the tips and the big axial primary compressor fans of jet engines.
@geoffkeller5337
Жыл бұрын
Would really like to know the titles of those books
@prodiver7
Жыл бұрын
Google axial and radial flow fan books. Fans and wind turbines share a lot of characteristics.@@geoffkeller5337
@ThinkingandTinkering
Жыл бұрын
huge amounts of work continues to be done mate
@philip5940
Жыл бұрын
All those reference and engineering books are immediately thrown out from deceased estates mainly because they don't look pretty.
@ABaumstumpf
Жыл бұрын
@@ThinkingandTinkering Sure - but many of the work from back then is definitive. For example we do know that american-farm-style windmills are scratching at the efficiency-limit for their size and purpose, and we know that 3bladed turbines have the best overall performance when considering changing windspeeds. More blades increase the poweroutput at lower windspeeds but their efficiency drastically decreases with speed.
@rayadagio
Жыл бұрын
Yet another new and exciting idea! Another potential way to increase the efficiency of a wind turbine would be to attach winglets to the blade tips to reduce vortexes at the tips, similar to those on the wings of many large airplanes. The improvement might not be spectacular (around 1%), but the best part is that it's cost-free :-)
@jitone1
Жыл бұрын
Is that why the helix fans were so quiet?
@AdrianCubas1980
Жыл бұрын
Super happy that you have found so much utility and have done so many experiments with the WINDTURER P4 blades and central hub. If you need larger blades I can design them and send you the files. I am currently working on a slightly larger version of the Windturer.
@mauriceupp9381
Жыл бұрын
The blade design is great I like it but I am very curious as to what he was doing with those cooling coils on the directional fan
@plan9channel7
Жыл бұрын
Me too.
@geraldlamontagne8585
Жыл бұрын
I would imagine that it is for cooling other parts or could be used for adjusting the air temperature to allow for it to be in a enclosure and/or induce a draft flow
@barryl9441
Жыл бұрын
Hmm, perhaps I missed it, looking at the video that looks like a bank of LED's.
@TuttleScott
Жыл бұрын
they're led's, you can see them light up
@ThinkingandTinkering
Жыл бұрын
they were LEDs mate to demo it was working
@plan9channel7
Жыл бұрын
KZitem chanel 'Gavin Freedom lover' has been using this design for quite awhile now. Albeit the first blades are smaller in length than the second set. Very impressive efficiency from your demo.
@peterfelecan3639
Жыл бұрын
For what's worth, if you wish to harden your propellers even if you print them vertically, as you've done, a simpler solution is to use a different material, e.g. PETG, print at lower speed to give time to fusion the layers and possibly increasing a little bit the temperature. This avoid goo-ing around with glue and such.
@garyblake4296
Жыл бұрын
Yup Petg is the answer.
@johnransom1146
Жыл бұрын
Couldn’t you cross laminate?
@mikedmann7487
Жыл бұрын
My fav time lord never disappoints! TY RMS for all your great videos.
@ThinkingandTinkering
Жыл бұрын
lol - cheers mate
@jesterblackguarde8464
Жыл бұрын
I feel like a proper test would be to compare the output of the 6-blade turbine to the combined output of two 3-blade turbines.
@ThinkingandTinkering
Жыл бұрын
for sure
@davidlockledge7879
Жыл бұрын
Please try it and share the results.
@JasonCummer
Жыл бұрын
But for scientic rigor you should still test a blade where all 6 are on the same plane and distance
@Teknopottu
Жыл бұрын
My first thoughts also.
@ThinkingandTinkering
Жыл бұрын
go for it mate
@JasonCummer
Жыл бұрын
@@ThinkingandTinkeringhaha fair enough :)
@Teknopottu
Жыл бұрын
@@JasonCummer I think we got the answer here.
@Kangsteri
Жыл бұрын
You can show everything with "reaction video" in the title. Have your gasping face on the corner and pause the video to explain something after every 30-60sec...
@MrTubeuser12
Жыл бұрын
I think tapering the blades in your design gives you less torque, and thus less overall power, to the hub, in the video, the blades are straight so there's more surface area and so more "push" at the furthest point from the hub which gives you more torque that can be geared up to make the generator run faster, also you'll notice the blades are curved, this can help with efficiency, PC fans are designed liked that for that reason. I wonder what difference having the fans contra-rotating would make, if any ?
@Frejjan
Жыл бұрын
Very interesting. I really hope you prints a test mount that has all six blades in the same plane and compare that. And/or start testing for the optimal distance between the two sets of blades.
@neilgillies6943
Жыл бұрын
Surely, this is just the same as a jet turbine compressor set in reverse? They are all stacked a distance behind each other on the compressor shaft.
@MrZriael
Жыл бұрын
Anyone else wondering if adding a shroud between the two sets of blades would improve the efficiency further? I’m thinking along the lines of increasing the pressure on the back set of blades by capturing lateral spillage from the first set. Anyone with a more intuitive sense of fluid dynamics got two cents for me?
@davidprocter3578
Жыл бұрын
On the road down to Mersea Island Essex there is a bungalow on the left hand side of the road, in the front garden there are a considerable number of wind turbines based in the main on bicycle wheels. As far as I am aware non of them do anything other than spin, however they are all different and as I recall one is of a fairly similar design to the one you displayed. I have never spoken to the bloke or had any contact so I cant tell you any more other than It is a while since I drove that route.
@leostarling5746
Жыл бұрын
Yes, I used to drive there too, years ago and remember it too.
@crispycornbread
Жыл бұрын
Great video. My intuition says it could work even better if the turbines were set up to rotate in opposite directions; but I ain't a turbine engineer so I'm interested in what others think.
@dmbrookfield
Жыл бұрын
The russian KA-52 helicopter already does this
@bernardmouchet2855
Жыл бұрын
wahoo! Just,, Wahooo! Many thanks doc....
@originsdecoded3508
Жыл бұрын
I think having grooves and ridges in the proper design of direction and arrangements would provide more optimal air drag surface tension, providing the wind more grip to push the blades with higher speed. Great job in this video in explaining everything so simple.
@chrisstevens2
Жыл бұрын
Robert, do you think it may be possible to print a part in plastic in a kiln and then drop liquid metal in it to replace the plastic, as an "easy" way to make specializd metal parts? That would be great to see!
@mark.guitar
Жыл бұрын
Easier to send them to a specialist casting company.
@ThinkingandTinkering
Жыл бұрын
you can buy wax filament for lost wax casting mate
@OldManSparkplug
Жыл бұрын
Electroplating over a dissolving filament gives an amazing result as well. I'm Juuuuust getting started down that road.
@NiteLynr
Жыл бұрын
That's a serious-looking improvement. I'd love to see a comparison of the output stats though, any chance of a quick revisit? Also, just a though regarding the hub/blade interface: keying the holes and pegs would ensure that the alignment is 100% true every time, especially for a portable version out in the wild. Great job as always, keep it up!
@hd-be7di
Жыл бұрын
A larger version with variable pitch mechanism might be interesting with this design. With a simple board like arduino or rpi it can get wind speed values fed to the pitch mechanism to drastically improve low wind performance without needing to double the blades. Thanks for the STL link!
@michaelhinton8608
Жыл бұрын
What would happen if you added a third set of blades.
@ThunderChunky101
Жыл бұрын
Interference rather than addition.
@orpheuscreativeco9236
Жыл бұрын
I was wondering the same. Decreasing the blade length (so the each wing tip has an offset that follows a parabolic cone dimension) and actually offsetting the rotation of each set according to the golden ratio. This is how many plant species grow foliage. Oftentimes the most sophisticated designs are found in nature 🤔 It might also mimic the airflow of a whirlpool or tornado.
@RandyZimmerman-pp5wj
Жыл бұрын
Why don't you use a smoke wand and you can show exactly how the wind moves
@ThinkingandTinkering
Жыл бұрын
good idea
@jamesdim
Жыл бұрын
What if we decoupled the two sets so they turn independently?! I wonder if that would increase the efficiency even more.
@skampp
Жыл бұрын
Like a 2-stage turbine? Probably! I love that idea.
@ThinkingandTinkering
Жыл бұрын
that is interesting cheers mate
@eeyzas2
Жыл бұрын
To further explore this, rather than two sets of 3 blades, I'd love to see a stack of 6 blades arranged in a spiral formation with a gap between each blade
@charleselertii6187
Жыл бұрын
Hello Robert. While the fan demonstration served its visual purpose for the camera, i think you would need to have more air space axially behind the aft end of the turbine blades so that the air would have room for flow thru without blockage and blow back from the cabinets which are close behind the turbine now.
@ThinkingandTinkering
Жыл бұрын
i agree mate - we have had this outdoors but i needed the set up to demonstrate the idea
@michaelrichey8516
Жыл бұрын
It was connected to the generator - why no volt/amp readings with and without the modification? That would have given a baseline comparison to show the efficiency increase. Logic says twice the blades = double the caught wind, but the rotational speed was quite obviously more than double.
@alycapo3391
Жыл бұрын
Download that one immediately lads lol couple of thingiverse and printables uploads so we know it belongs to the inhabitants of earth 🙏
@littleworkshopofhorrors2395
Жыл бұрын
Have you tried 6 blades in the same plane, to show whether it is better to have them separated or not ?
@Teknopottu
Жыл бұрын
.
@ThinkingandTinkering
Жыл бұрын
give it a go
@SoundzAlive1
Жыл бұрын
Hi Rob, You did not mention what would happen if you add another layer. So three sets of blades separated. I see what you are saying about being in the same plane it would be more like a disc and restrict air flow but adding more sets of blades in your arrangement might not reduce speed and increase torque. André in Sydney
@andrewalexander4024
Жыл бұрын
Another great step in maximising the effectiveness of the blades great vid robert
@NZHippie
Жыл бұрын
It's pretty obvious that the blades have been doubled ergo an increase in speed ... Another very practical example of physics at work Robert...
@paulvdimitry9931
Жыл бұрын
It would be interesting to see demo with smoke? Is there a critical spacing? Duel generator Ferris Wheels. Note faster isn't always good for generators. If 2000 rpm is a good speed for generators maybe a CVT gearbox ?
@ryanjamesloyd6733
Жыл бұрын
ok, having just seen the clip, I'm going to guess before I watch the rest- more total blade surface area for the wind to act against- because quite a lot of wind just passes Between the blades, doing Nothing and not being caught. I'm sure this is a thing with tradeoffs. Now lets see what you have to say.,,, Ok, video watched: Well, Rose turbine, or the... that one that cones to a squirrel cage- does it spin faster than those? I'm not seeing, beyond more blades catching more wind, why this is particularly cool? What am I missing here Rob?
@MikePreston-darkflib
Жыл бұрын
I think you'll find that only at low speeds is it more effective... Blades are designed for specific windspeeds, swept area and tip speed ratio. You have essentially taken blades designed for higher windspeed, doubled them and assumed that it has simply improved the turbine generally... You will find that at the higher end, the efficiency will plummet as betz theorem shows that you can only extract a certain percentage of the available energy. There is a great book by hugh piggot called windpower workshop. I believe he may also do courses at CAT in Wales still.
@Sailorman6996
Жыл бұрын
The start of a turbine is not too interesting, not more than if it's a faulty design it may not art at all or very late so you miss out of production. Apart from that - from a standstill most wind just pass when you have three blades, and maybe 50% pass, 50% is used when you have 6 blades. The characteristics will change with more blades. It will start sooner, more power at low winds. But at high wind - the extra blades cause more drag than they add power, so loss really. 3 or 6 is more a question of how is the site, slow and turbulent, or fast and smooth. Do you have a limited swept are (blade length, 3D printer size)?, Does generator want high RPM or lots of torque? Dual rotor 3 blades in front of another 3 blades, or one rotor with 6 blades. It's really hard for me to see any benefit with dual rotors or what you want to call it. Seems like a waste to me.
@paddy2661
Жыл бұрын
The poor bugger just lost billions making that public. Yes I picked up Robert front blade sheds the air to second/rear blade. Few years back I thought why isn't there a design to capture/second Youse of air coming off wind turbines , well here it is geez I wonder how that would go on aeroplane prop or jet engines, sorry engineering department public nolage now. That's brilliant Dr Robert going to be great efficiency out of this one.
@coltenwatkins6058
Жыл бұрын
Is that PLA? you should try printing PETG if so. Much tougher stuff and the printing temperatures aren't much higher.
@HeartmindUK
Жыл бұрын
Hey Rob, love your work. Thanks so much. Question: how would this blade design and set up work for a micro-hydro turbine system? Would it not work the same in generating better performance so could be used in a small stream?
@ArcAiN6
Жыл бұрын
Two points here: 1) There's no need to print the blades vertically, in fact, you can print them at literally ANY orientation. Just clean them up after the print, smooth them out, and use the packed-salt powder method to anneal them (stronger bond, smoother surface) 2) I feel there are glaring flaws with this experiment. I don't think it's an accurate method of testing, and the results may be skewed in several different ways. If you were to reproduce this experiment within a closed chamber, using a proper collimator, i'm pretty sure you'll find that the turbine doesn't in fact spin faster, but rather, it accelerates faster. This is because no matter how much surface area you give the device, it can only go as fast as the air can pass over the blades and impart their energy. There is a diminishing return between surface area, and mass in this context. The more blades you have, the more mass you have to move, and thusly, the energy required to move the fan is increased. Yes, the device will accelerate faster, but it's top speed (how fast it can actually go) is directly proportional tot he energy imparted to it. You're effectively trading collected energy for faster acceleration, and then trading even more energy collected for mass, and because of these trades, you'll not be gaining energy collected from slower, less powerful wind. Effectively, you'll be operating at a net loss, not a net gain.
@dmbrookfield
Жыл бұрын
Anotehr great video. Isn't the number of blades to do with the lift you can produce not that it is blocking after all they are moving. By this I mean turbulence after a blade goes through it's sweep reduces the laminar flow and the lift, offsetting allows more laminar air and so prodcues the lift needed? BTW There are Helicopters that use dual plade systems but they counter rotate. The russian ka-52 Alligator, I have it on good authority that virbration is a big issue, but if that is the counter rotation I have no idea. But a big shout out to you I love watching your videos, :)
@stephenpearce3880
Жыл бұрын
Hi Robert, under KZitem t&c's you can repost and show any other videos from youtube provided you add adfitional value, such as commentary or additional information. This is not generally known, but it accurate. So you can show the original video, if it was hosted on YT
@gaemlinsidoharthi
Жыл бұрын
Has anyone tried putting more layers of blades with a smaller angular offset, either staggered or arranged to form a kind of helix? (Sorry. I know that wasn’t the best description but I hope you know what I mean.)
@colinkeizer7353
Жыл бұрын
Fascinating how so many people are thinking about sails and adding one or two turbine blade sets to an 'outside' wind turbine exposed to the elements. My first thought when I saw Robert's demo was to visualize a stack of turbines and stators, just like inside a jet engine or steam turbine. The design will have to be optimized for wind driven air compressed into a chamber attached to the top or bottom of an appropriately designed Darwin wind collector, then attached to a generator. I'm very excited by this concept, and I believe I hear something like it in Robert's comments during his video. Sure hope I see him demo the idea. I'm finally compelled to warm up my own 3D printer and try some models of my own. I think I can stack rotors between stators with glass ball bearings between them . . .
@Warp9pnt9
Жыл бұрын
Makes me wonder, if there's an upper limit (probably) to returns for more stacks of blades. Is there a sweet spot for distance between blades? Does the distance sweet spot vary the more blades are stacked? Then I start thinking of the practicality of the modular gearing system. As-is, this cuts the cog for generators, so you'd need one generator per set of blades, which seems redundant. Need a central axle (with the gen on trailing edge?), where you can stack on more sets of blades, and vary the distance between them, for testing. A really sophisticated rig might dynamically vary the distance between blade sets, even the rotation of the blades, with varying wind speeds. I'd also try different blade designs. The noisier the blade, the more wasted energy. Taking a cue from some popular computer fan manufacturers, I might try some ridges along the short edge of the tip of the blades (as well as dimpled blades - creates a shroud of air which has lower resistance than even the smoothest surface, and potentially even well-tolerates crude application with a rough surface), and maybe even put them into a shroud, maybe with some sort of parabolic cone of sorts. If you see where we're headed, essentially making a simplified turbine. That sucker sure spun surprisingly fast with just the one additional set of blades. It made me worry if those blades might become a hazard and fly apart. Some kind of variable resistance generator, or a clutch to add more generators, might be handy to absorb extra energy. But then rather than the tension stress of centrifugal force, I'd worry about the sheer stress of the blades or maybe even the main shaft. At some point, you can max out the safe operation of each component, and then have to start braking, and shutting down the turbine. But, dynamic controls for each aspect might allow additional energy extraction along each of the individual stress/failure curves or whatever. I'm not an engineer or anything, these are just ideas that pop in my head as I imagine the various forces at play, and all the questions that arise about maximizing energy extraction per unit mass of the blade material and energy invested for manufacturing.
@stewartpalmer2456
Жыл бұрын
If you are using PLA, you can also try and alcohol dip and dry. This will melt the layers together. ABS requires an acetone dip.
@wannabemgtow2540
Жыл бұрын
I'm glad you said that if I put a video out on my idea then it becomes public domain, I have an idea that only share one person so I still might keep it to myself.
@rbdogwood
Жыл бұрын
It looks like a useful development and further down ie previous to this, a suggestion was made that maybe 3 layers would be even better. I don't know if it would as my brain is quite old, however jet turbines use multiple discs of blades. That construction might be worthy of investigation. They can also be supported at both ends of the axis.
@3xblahblah
Жыл бұрын
I don't have the equipment to try myself, but I was just wondering what would happen if you had 2 separate, contra rotating turbines. Would the airflow from the 1st interfere with the 2nd, or assist ?
@thrapsed
Жыл бұрын
Maybe by adding lumps to the blades they will become more efficient, just as the lumps on Humpback whale fins have proven to increase efficiency in water.
@gosekinz
Жыл бұрын
what happens if you have contra-rotating tri-blades ??
@noaholiverpang5250
Жыл бұрын
Could it be that the three-bladed turbine is experiencing stall? if both turbines were angled and loaded optimally for efficiency at a certain windspeed then perhaps they would both be spinning similarly... I would assume there is also a tradeoff between the increased torque of more blades with their increased drag. (making more blades better at lower speeds and vice versa)
@undernetjack
Жыл бұрын
It seems like the mechanics found inside a turbojet engine, except that in a turbojet the next row/ring of blades is smaller and smaller as you go further back. The real wonder is why nobody has tried this in commercial wind turbines long before now.
@RA-gk5zg
Жыл бұрын
How is this any different than just increasing rotor solidity? That is basic helicopter aerodynamics. It must be optimized for the defined conditions. I do not believe for a second any slot effect. If that was possible every helicopter would have that design.
@leonmccarty9430
Жыл бұрын
Like to see if this works, It would be right up in your format of experiments. Using a compost pile heater combined with a thermal tower, and a small wind trebin to produce electricity. The idea is to have a generator that runs without depending on natural wind flow. If one is concerned with adding heat to the atmosphere, then the up draft can be turned in a slightly extended u ture. Place a misting valve at the second elbow that turns down wounds. This will drive the air flow down, to run a second turbine.
@garyblake4296
Жыл бұрын
To add to the PETG comment I printed 1 blade today using petg with 100% infill and you could use it as a bread knife.
@MagicianMan
Жыл бұрын
Surely that design lends itself really well to having the motor installed in the middle? By doing this you also reduce the angular loading on the bearings that must surely occur when having 2 sets of blades projecting forward of the motor?
@grahamdavid007
Жыл бұрын
rob - could u just reverse the 2 fans - stick together - to greatly reduce the gap n see result? could you create a simple 'gap-controller' to find an optimum gap ? great vid thanks
@leonmccarty9430
Жыл бұрын
To continue on the thermal tower compost generator, it would increase air flow using banewlys theory. Where fluids flow faster as a pipe narrows dropping the pressure. So a cone with the heating elements going around it at the bottom of the tower can be the first stage increase. Then a cone shape narrowing of the tower's passage may increase the flow. Same with the down flow side. You see sir, the compost pile heater can run without the worry of outside parable. Add a second compost pile, for when the first one needs refreshing. Enjoy this challenge!
@petewright4640
Жыл бұрын
Just to set Robert straight on this: When the turbine is spinning very slowly the blades are effectively stalled (wrong angle of attack) and so they generate very little torque. The three blade version was unable to generate enough torque to overcome the bearing friction when turning at low speed and so could not reach the speed necessary for the blades to become efficient. The six blade version could overcome the bearing resistance sufficiently to spin up the rotor and so enter the rev range where the blades became efficient. This means that if there was less bearing friction then, once at proper speed, the three bladed version could well be more efficient. Blades can be designed to be for high speed rotors, with few blades, or low speed with many blades.
@sirskullington9213
Жыл бұрын
What about coil spinning one way and magnets tother? I’m guessing it’s been done before? Anyone?
@williammaxwell1919
Жыл бұрын
Modern commercical propeller driven have up to 6 blades, yet commercial wind turbines have only 3 blades so are using less of the energy. I've played with different concepts to fit more blades as there is a limit to how long a blade can be realistically made
@karljay7473
Жыл бұрын
It looks as if the 2nd set of blades is using the wind pushed off the 1st set. Adding some smoke streams should show the flow pattern. IIRC, jet compressor blades do this.
@Rebar77_real
Жыл бұрын
How about three sets of blades at less degree of separation? At what point is the weight not worth it? With four sets can you cut the blade size in half? Wait a minute is that a backwards jet engine? etc... :D Neat stuff!
@WesternIronwoks
Жыл бұрын
you could put more groups of blades on that and gain more from the wind but that would require testing to see what spacing would be needed. I wonder if it would act like a jet engine and stators would help redirect the wind flow after hit by a set of blades. maybe even counter rotating blades. just a few thoughts.
@velcroman11
Жыл бұрын
I wonder why you didn’t make the fan blades with the graphene plastic?
@CelloSounds1
Жыл бұрын
I wonder whether 3 layers of 3 blades would improve things more again?
@clambert24
11 ай бұрын
The stl file has an issue and the centre cog isn't complete and a tooth or 2 isn't manifold and won't slice properly. Can this be fixed pleased. Desperate to make this.
@steverichmond7142
Жыл бұрын
This looks like a Fairey Gannet with two blades on one shaft, driven by a Mamba turbo prop.
@consaka1
Жыл бұрын
More blades equals more torque at slower speeds and perhaps a built-in brake for stopping over speeds in high wind conditions.
@zacharyybarra
Жыл бұрын
Vice versa the V for the greatest inpull. Or no wait. Try keeping all V blades in the same direction. Ok more tests!
@petevenuti7355
Жыл бұрын
Do you also get a performance boost using it as an airplane prop or fan blade? (I've seen a similar design on a automotive radiator fan, but didn't think much of it at the time)
@PartsandRestoration
Жыл бұрын
I think you just invented the aerodynamic turbine motor/generator
@wasunka
Жыл бұрын
Just curious, have you tried counter-rotating propellers? Has anyone?
@lnwolf41
Жыл бұрын
You should have twisted the blades 180 degrees so we can see what the 6 blades would do.all facing the same way.that
@eastcorkcheeses6448
Жыл бұрын
Originally i thought it was going to be contra-rotating blades , How large do you reckon this could be while still getting this benefit ..
@garywillis5790
Жыл бұрын
I wonder if this is why birds fly in a V shap? The first blade paves the way for the next and creates drag at the back blade? This is my interpretation of this?
@drewh-wd2ct
11 ай бұрын
Has anyone made a single adapter for the six blades. If they have could you post the stl files thanks.
@michaelschauperl172
Жыл бұрын
I wonder if that effect could be replicated on a helix formed savonius type wind turbine and what happens if there is a third layer of Turbine blades
@codymovald2123
Жыл бұрын
Am I the only one who can not slice the blade file? I was hoping to print it to compare it to my own blade profile which I suspect is not very good
@stevefrancis4949
Жыл бұрын
Thought one of your rose or a few of turbines you were going to put on the Darwin were solid and they span well. Plus the peloton one build worked better facing the wind confused
@historyisfake9153
Жыл бұрын
Maybe its due to not being in the air displacement so ur getting more out of it due to that? Maubeball blades slightly different to make it faster? Just a guess xx
@PhilippinesUntold76
Жыл бұрын
I wonder if a third set of blades or even 4,set behind again, could give even better performance?
@brendancull8316
Жыл бұрын
I've just had a thought, as there is two different blades on this, would it lower the Betz limit of the turbine?
@johnskinner7571
10 ай бұрын
I know you don't read a lot of these posts, have you tried annealing the pla prior to super glue application?
@paulbrouyere1735
Жыл бұрын
I think I also saw that video, is it possible he also created a windturbine with 2 different rotor diameters?
@pauldent3059
Жыл бұрын
It looks like it's creating a vortex between the blades which is increasing the wind speed,
@BradKarthauser
Жыл бұрын
I've got a fiver to pitch in on a fume hood for your Christmas present Robert.
@davidellis1355
Жыл бұрын
What do you think the optimum spacing between the blades should be ?
@perpetual4958
Жыл бұрын
So the phase difference and therefor distance offset will vary by windspeed?
@EviLEwoK666
Жыл бұрын
i wonder what would happen if you added a 3rd and 4th set, so that each blade is offset by 30 degrees to the blade behind it?
@stevetobias4890
Жыл бұрын
Very impressive Rob, also thank you Ben
@chrissscottt
Жыл бұрын
Cool. I can see where you're going with a vertical stack.
@TuttleScott
Жыл бұрын
the blades on the demo double stack are about 2x as wide as the single stack.
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