Hello everyone, I’m seeking advice on the best rpm range to have for best overall performance on floats, cruise/takeoff distance.
I have a Bushcaddy R-80 with the 912ULS, I’m running a 69” three blade ground adjustable “KOOLprop” which is very similar to the kievprops.
I currently have it set as follows;
5600RPM firewalled when static on the ground
In straight and level flight I can overev the engine if I firewall, it went up to 6000 and I immediately pulled back power a bit.
At 5200rpm I’m seeing cruise speeds of 75mph which seems to be about 10-15mph slower than reported numbers from other people running the same plane/engine on floats.
I know fine pitch is better for takeoff performance and coarse is better for cruise, but I’m actually wondering, is it possible to be pitched too fine that you’re actually hindering performance? Would I potentially see improved takeoff distance with a coarser adjustment?
I’m open to suggestions on what I should be aiming for with static rpm firewall on the ground and rpm when firewall in straight and level,
Again, i’m on floats would like to keep takeoff distance to a minimum to get in and out of small lakes.
Thanks in advance.
I have a Bushcaddy R-80 with the 912ULS, I’m running a 69” three blade ground adjustable “KOOLprop” which is very similar to the kievprops.
I currently have it set as follows;
5600RPM firewalled when static on the ground
In straight and level flight I can overev the engine if I firewall, it went up to 6000 and I immediately pulled back power a bit.
At 5200rpm I’m seeing cruise speeds of 75mph which seems to be about 10-15mph slower than reported numbers from other people running the same plane/engine on floats.
I know fine pitch is better for takeoff performance and coarse is better for cruise, but I’m actually wondering, is it possible to be pitched too fine that you’re actually hindering performance? Would I potentially see improved takeoff distance with a coarser adjustment?
I’m open to suggestions on what I should be aiming for with static rpm firewall on the ground and rpm when firewall in straight and level,
Again, i’m on floats would like to keep takeoff distance to a minimum to get in and out of small lakes.
Thanks in advance.
