I replaced my Viper 19" props with Rebel 17" props and did a number of tests to compare performance. This test is a "plane on one" test where the boat gets up to ~35 mph using a single outboard running at 5100 RPM. Normal full-throttle with both engines is 5700 RPM and 49 MPH.
The audio about 1 minute in is difficult is understand but what I am saying is that with a 1994 Hull/Transom and near 8 year old E-Tec engines, I'm not going to try a hole shot - rather, I'm going to gradually increase the throttle until eventually reaching WOT. You can hear me inching it up at 1:37 and again at 1:47 where it starts to climb up onto plane and hits 13 kts (15mph) at 2:03 and 4000 RPM. I start messing with the trim at this point and end up at 1/4 trim at 2:48. During the time I was messing with the trim I inched the throttle up the rest of the way. The final number were 30.1 kts (~35mph) at 5100RPM. The actual trim tabs were up and out of the way - all trim was handled with the single outboard. I probably could have got slightly better performance if I used them as well but was trying to keep it simple.
The audio at the end that is difficult to understand is me commenting on the fact that I forgot to check the fuel burn rate. The normal WOT fuel burn rate is 21GPH per engine so it was probably close to that.
Note that this mid 90's Sailfish is not known for great planing performance because it has a shortened running surface compared to the 1998 and later models where the running surface extends to the end of the Euro-transom. Thus this should be easier to do on the later Sailfish including both the 272 and 282 (which are the same length.) There is a typo in the video where I list the beam as 9'8" - the correct beam is 9'6".
I hope I never have to come back on one engine but it's good to know that I can do it in a hurry if I need to.
Cheers,
-Scott
Негізгі бет Plane-on-one test with 17" Rebel Prop on E-TEC 200HO for Grady White Sailfish
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