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RV-8 Prop CG Arm Position

olyolson

Well Known Member
Friend
Reading the Build manual describes the datum and arm positions for the RV-8. I know what I really need to answer this question is to go out and measure this at the airplane in the hangar. I wont be back out to the hangar for a while to do this so hoping someone has this info already from measuring.

Standard RV-8 cowl with a 2 blade Hartzell HC-C2YK-1BF metal constant speed prop.

I'm considering replacing the Hartzell with a 3 blade MT12B-183-59B prop and would like to run the CG calculations beforehand to see how it works out.

I was going to just scale the CG drawings but after talking to Sterling at Vans tech support today he said the drawings are not necessarily to scale. Well I tried scaling them anyway just for fun and came up with 19.25" Arm for the prop so I think he may be right. Another RV-8 buddy said it's at 11” Arm. Does anyone have this info?
 
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