F84 bear cat cg problem

[FlyKai]

I'm running the Admiral 4000 4s all the way forward on first flight. Elevator was neutral trim neutral took off no flaps. As soon as I got up she wanted to pull up like she was extreamly tail heavy. I pushed forward on still adding down trim until I was out. I let go of the stick and she climbed but not nearly as bad as the beginning. I landed added 12 7g led to the nose and put the trim to center. Adjusted the elevator to neutral. Took off again and she was tame. I was wondering if anyone else has added this extream amount of led in the nose even with the admiral 4s 4000 lipo.

[AkumaZeto]

That seems odd. Was the factory lead still there?

[Beeg]

That is odd. I have to ask, are you sure the battery didn't slide back on takeoff?

[FlyKai]

I used the cg from the manual and it was falling back like it wa tail heavy. When I added the lead and put my fingers back it was balanced. Didn't know the plane had lead already installed Akuma. I did have battery velcroed on the battery and bottom wood so no it couldn't have slid. Plus the Velcro buckle holding it in. Has anyone flown on a 4000 4s all the way to the front and add little to no lead in the nose?

[Beeg]

I've run 2750 MAh batteries with no added weight. It was a little aft CG but still very much flyable. With the 4000's it just about right with no added weight. The bigger the battery the better. Some guys are even running 5000+ batteries just fine.

[rifleman_btx]

I had an old hellcat that did that. It was a total handful. May she rest in peace.

[FlyKai]

Does anyone know if the bearcat came with lead from the factory? I bought another bearcat and the second one has les cg problems then the first one.

[seaviper]

Man I tell ya. the CG issues I've seen since returning to this hobby are absolutely uncalled for. The CG range is something that should be proven in testing on day one.
No matter what battery or how heavy or light your ship is, the CG should not be in question. How you position your battery and gear is up to you. But the CG you are striving to achieve should be accurate in the manual.

My T45 was perfect as per manual. So whoever flight tested that one did a good job. But, my FMS P-40, not so much. The recent Scorpion launched nose heavy as well. I got her tamed and down safe but she has a healthy up-trim in the stabs. That is inefficient.
I am working the battery back to eliminate that up trim. I like all my ships to be pretty much trim free.

[Grossman56]

Strange....
My Bearcat is perfect with a 4000 all the way forward. Try it on a CG machine and see what you get. Having two makes a side by side comparison something you may want to try as well. As for factory weight, I haven't noticed any on mine. Is there any chance that your elevator may not be neutral??

Grossman56

[FlyKai]

she looks as close to neutral as it gets. I have a Great Planes CG machine. Ill try it out on that. Its just weird the second plane I bought is close to perfect while the first bearcat I had to add tons of weight. I did test the cg with only my fingers that time so ill check it with the Great Planes when I get it in the mail.