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Old 06-16-2019, 07:23 AM
Mikester is offline
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United States, OK, Lawton
Joined Jun 2012
8 Posts
I have the same problem with my RV4, very difficult to fly at the cg recommended in the manual.
The manual cg is at 34% of the wing chord, very far back. I think the cg should be between 24% to 32% on most planes. I have added weight to move my cg up to 28% or 5" from the leading edge. This took 24oz of weight to get it done, my batteries were already up front. I'm running a RCGF 35 and it is lighter than most engines being used on this plane. I just changed the cg yesterday and have not had a chance to fly it yet. I bet it flies much better. Have you measured your cg since moving the batteries ? Maybe that didn't change your cg enough. I was surprised how much weight it took to move my cg, I just hate to add weight to a plane but flying tail heavy is definitely not fun. My cg was at 6" on the initial flight and it was terrible. The recommended cg is 6 1/16, might be ok for 3D or something but not for me.
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