Adding stability without sacraficeing manuveribility?

[Mat]

I have a 3D stunt plane that is very unstable, if I add more vertical stableizer area will it be more stable? What needs to be changed for a stunt plane to be stable but go where you point it? Why are some planes more stable?

[Sparky Paul]

In which axis is this instability?
How is it demonstrated?
What's the plane/power?

[Mat]

It seams to slide sideways on the yaw axis during alot of general and tight manuvers.

How does Dahedrill make alot of planes seam to be more stable?

[BMatthews]

How about some pictures? Or a link to some pictures if it's a kit. Also where is the CG located in terms of % of the wing chord?

OK, if you do a simple turn at about a 30 to 40 degree bank do you find that you need to keep constantly inputing a bit of "top" aileron control to keep it from trying to tighten the turn up on it's own?

Or does it seem to let the tail hang low in the turns and you find it tries to yaw away from the direction you try to roll it with the ailerons so that the turns seem sort of crossed up?

[Mat]

It is simalare to the hobby-lobby Mini Gee Bee, but is a home made version. The cg is at about 1/2 the way back from the front of the wing, Is this probly the major problem?

[BMatthews]

Yeah, very. It's basically a flying wing. As such it should balance no more than 25% back from the leading edge. When you calculate the 25% figure include the controls as part of the wing chord size. For hovering and stuff you may find it helps to have it back as far as perhaps 30% but once it gets behind the 25% mark it's going to get a lot like trying to fly an dart backwards really fast.