Thanks for your replies.

The model in question is a scale combat Ho-9, which is a flying wing.
So far on my conventional models with fuse I used the method of Center of Lateral Area, which is old, it has been critised a lot, but for me it worked well.(Andy Lennon explains it in his book).
For the flying wing Ho 9, I made it first with one central fin attached to the tail . It seems to fly well, but of course it is not scale.
So instead, what I came up with was to make immitations of the drag rudders - they would be triangular vertical fins 4 on each side (2 top and 2 bottom) and one clear lexan tail skid. That should provide the plane with enough lateral stability for the combat , even for the drag imposed by having a streamer cought on one wing for example.
This is a link to pohoto of one of my prototypes.
This one is actually the SSC (Slow Survivable Combat) and not the scale, but the dimensions are the same, engine is smaller 0.15 instead of 0.25.



click for larger pics:

http://www.msnusers.com/Compositemol...oto&PhotoID=75
http://www.msnusers.com/Compositemol...oto&PhotoID=76


Petr