Maybe C.G issues?

[Chuck21]

Hi! I am pretty new to 3D. I went out the other day and flew my 30cc aeroworks yak. It flew great for the most part. It prop hung easily, pop tops looked great, knife edge flight coupled to the belly pretty bad. I could not get a pretty looking flat spin, up right or inverted. The plane just looked out of control during the spin. I also could not get it into a knife edge spin. Any tips on what could be causing this? Could C.G be an issue? like maybe to nose heavy? Thanks in advance.

 

[Bipenut53]

Hi! I am pretty new to 3D. I went out the other day and flew my 30cc aeroworks yak. It flew great for the most part. It prop hung easily, pop tops looked great, knife edge flight coupled to the belly pretty bad. I could not get a pretty looking flat spin, up right or inverted. The plane just looked out of control during the spin. I also could not get it into a knife edge spin. Any tips on what could be causing this? Could C.G be an issue? like maybe to nose heavy? Thanks in advance.

Hi Chuck,
Yes you are probably on the right track, a good way to check CG on that plane is to fly inverted at a 45 degree upline at half to three quarter throttle. If the airplane climbs with hands off it is tail heavy. If the airplane drops its nose quickly then it is nose heavy. If the plane continues the 45 degree upline for quite a ways then starts to gradually drop the nose then the CG is correct. Every airplane acts differently in spins, to flatten out the spin you want to gradually feed in a little opposite aileron until it flattens out, some airframes take little to no opposite aileron and some take almost full opposite, just play with it until you find the correct aileron input..... Hope that helps a little...