Hi folks,
I am in the early part of phase I testing. I am trying to figure out if I have the correct pitch. Here's the data:
RV 8
IO 360 M1B with 9.5 pistons, dual Plasma III ignition, 185 HP printed on the plate
Catto 3 blade prop 66 inch diameter, 75" pitch. I requested a cruise pitch when I ordered it.
When I take off with full power, showing about 29 inches MP, I turn about 2300 RPM. Cruise climb at 110 kts is about the same. Level off at 4500 feet and I have to throttle back to about 21 inches to keep the RPM at 2500. Any more throttle than that and I am overspeeding the 2700 RPM that I think of as redline.
A knowledgeable EAA guy here told me that the old rule of thumb was to go to 7500 feet and open it up. If you were about 100 RPM over redline, the pitch was correct. I did that operation and the engine went to about 2800 RPM (2780 to be exact).
So the question is, do I have the correct pitch?
I am in the early part of phase I testing. I am trying to figure out if I have the correct pitch. Here's the data:
RV 8
IO 360 M1B with 9.5 pistons, dual Plasma III ignition, 185 HP printed on the plate
Catto 3 blade prop 66 inch diameter, 75" pitch. I requested a cruise pitch when I ordered it.
When I take off with full power, showing about 29 inches MP, I turn about 2300 RPM. Cruise climb at 110 kts is about the same. Level off at 4500 feet and I have to throttle back to about 21 inches to keep the RPM at 2500. Any more throttle than that and I am overspeeding the 2700 RPM that I think of as redline.
A knowledgeable EAA guy here told me that the old rule of thumb was to go to 7500 feet and open it up. If you were about 100 RPM over redline, the pitch was correct. I did that operation and the engine went to about 2800 RPM (2780 to be exact).
So the question is, do I have the correct pitch?