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Props - RPM's and Cruising Speed
On Sun, 30 May 2004 20:03:31 -0700, "Lloyd Sumpter"
wrote: The secondaries really open because of THROTTLE setting, not RPM, correct? So how about this: DECREASE your prop pitch. Then you're running at a higher rpm, where the engine puts out more power at lower throttle setting. I suspect you'll be able to get that few more knots to get fully on plane at a lower throttle setting than with the "steeper" prop. Worth a try... I actually thought about adjusting the linkages on the secondaries so they open at a higher throttle position; so they open, for example, at 3,400 RPM's rather than 3,200. Manifold vacuum may also be a consideration. I realize there's no way around inboard gas engines drinking fuel like a teen at his/her first frat party, but there's a noticable difference in noise and fuel comsumption when those secondaries open. Whether going up or down in prop size, going to four blades, or whatever other options there are, if I could get 24kts out of 3,100 RPM's with these engines, I'd be in very good shape! |
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