| smokyray |
03-06-2012 08:32 AM |
Not so fast...
Quote:
Originally Posted by paul mosher
(Post 636025)
actually prop rpm is restricted by prop manufacturer. Exceed rpm limits and it is a mandatory overhaul.
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Not quite. 2700 Max RPM on C/S props is correct for most manufacturers recommendations for certified applications and has carried over on experimental props sold to be installed on Lycomings. Being an IA I'm sure you know once you paste "experimental" on your type certificate, all bets are off. You don't have mandatory limits on anything per say, except your conscience, your posterior and the approved limits/maneuvers posted in the logbook during the test phase. If you follow certified standards and limits for your RV experimental airplane's engine/prop, good on ya. Years of testing, NTSB investigations and lawsuits have set the ultra-conservative limits on most parts sold by major aircraft parts companies. They do however perform very well beyond posted limits...
Even Hartzell likes racing airplanes and their custom made props for Dave Anders, the Reno Lancair Legacies and others have higher RPM limits (2900-3200) and were built specifically to run at higher RPM's. How are they different form a stock Hartzell? Call Kevin Karam at Hartzell, he'll tell ya. Craig Catto's background is Reno racing. His props come into their own around 2850 and "posted limits" up to 3200 for my 2 blade. Lycoming's limits running above 2700? That's another discussion for another day. Ask Mahlon, he's on the site.
FYI...
V/R
Smokey
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