Burrell Special Scenic Showmans engine No. 4030 'Dolphin' generating at the Great Dorset Steam Fair 25th August 2018, powering Edward Howard's 'Atlantic Star' 12-car Eli Bridge big wheel.
This video was made to show the effect of varying electrical load on a generator. The Mather and Platt dynamo is producing 110V DC and supporting a steady lighting load of about 12kW, taking 110A as shown on the ammeter. The wheel is being loaded with riders and each time it is moved to the next empty car, a short burst of extra load around 60A is taken by the ride motor. You can see and hear the engine react to that load as it first slows,, then returns to normal speed once the governor increases the steam admission. Near the end, the ride's rheostat controller handle can be seen.
'Dolphin' was one of the last and biggest Burrells, built in 1925 and rated at 10NHP. I am not sure whether the dynamo is original, it would have been a Mather and Platt P8C main dynamo with a P3C exciter. The auxiliary / exciter dynamo allowed for variable excitation voltage-control of the main dynamo as per the Ward-Leonard drive system, needed for starting the very heavy Scenic Railway rides under fine control. That system is not in use here and the auxiliary dynamo is not belted up.
'Atlantic Star', the 12-car Eli Bridge wheel owned by Edward Howard, was built in Illinois in 1947 and is identified as BW04 in the NFCA digital archive.
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