Sorry to bring this thread back to life.
I have an LSA with a 912is and a DUC prop. I have it set so my average cruise altitude (3,500) at WOT, I am getting 5520 RPM. On a 80kt climb I'm seeing around 5100 rpm (Vy is 72) and about 750 ft/min
My rationale, may be flawed but this is my thinking:
1. I do quite a few cross-country / long flights so speed is fairly important, but fuel efficiency is not that important to me.
2. I wanted a prop pitch so WOT I am right at or below the 5500 RPM max continuous for the engine. This way I get the best top continuous speed.
3. At level cruise, the engine likes to be at 5000rpm or less --OR-- WOT / out of ECO mode. Anything in between the EGT tends to get a bit hotter than I like.
4. If I pitch the prop to have a WOT at 5600/5700 RPM, I believe I will lose top-end speed and I will likely have heat issues because to get the engine into a full rich mixture I will be over the max continuous RPM.
Thoughts?
