[Amc-list] Interesting Water Injection for DIY

[Don Johnson <donjohnson@xxxxxxxxxxxx>]

Sandwich Maker wrote,
" For suppressing detonation the amount and timing would be pretty critical. I " bet all that aircraft stuff is well-documented somewhere, especially the old 
" stuff. Would be some interesting reading. 

Actually, as mentioned, most aircraft engines were using magneto ignition and it was fixed with no variation. That's because most aircraft engines RPM is governed by the size of the prop unless the prop is gear driven. The engine runs at a pretty constant RPM and the pitch of the prop changes as the speed changes.
The tips of a propeller cannot be driven faster than the speed of sound otherwise the efficiency of the propeller drops almost to zero.
Small Cessna props are limited to around 3500 RPM. Big props like on a Spit or Mustang are limited to around 1500 and helicopter blades are around 500 or so RPM.
Thus ends your first ground school lesson........
Don
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