At 08:52 PM 8/26/2013, you wrote: >Does anyone know what an acceptable standard for (fixed pitch) rpm >loss with altitude is? For example, I was told, you'll lose 75 rpm >for every 1000' altitude, regardless of mixture setting or climb/cruise prop. ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
You will loose approx 1 inch of manifold pressure with each thousand feet of altitude but that doesn't relate directly to rpm. I was at 9000 feet yesterday and still pulling 2450 rpm at cruise power setting. If the 75 rpm lose per 1000 feet were true I'd have lost 675 rpm and that's not the case. I fly with an 0-200. Larry Flesner
