ORIGINAL: proptop
Ed...if the engines are quite solidly mounted, will the V-20 pump(s ) still work adequately? Don't they need to shake around somewhat to be effective?
The nacelles on the B-17 are big and fairly "solid" structurally and the engines/mounts aren't going to (better not! ) shake or vibrate very much...
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If you were to take a large anvil and mill an engine mount into it, the VP-20 pumps would still get enough vibration to operate IF you attached the VP-20 pump to the front of the engine right in front of the pushrod tubes. The aluminum crankcase moves quite a bit even when the bottom is firmly attached to something super solid.
In a model with so much room inside the nacelle, why do the fuel tanks have to be so far from the engines? Retracts in the way?
Like others, I'd rather go with a Cline or Iron Bay regulator system. The low end is infinitely easier to set and more reliable.
Ed Cregger