JohnMac,

Thanks for the information. My Viggen is a slightly smaller than the Jim Fox airplane. I guess that I will hold off installing the speed brake actuators pending the CG location. If I need tail weight, I'll make them active. Otherwise I'll just use the top speed brakes for access to the glow plug.

My Reaper is HUGE in comparison to my Viggen. With the MW54, I find it hard to slow down, so I'm a little leery of the residual thrust on the smaller Viggen. I guess with the canards extended, one can get a fairly high drag profile established. Additionally, the wing loading is going to be a lot higher which will necessitate more AOA hence, DRAG.................Right?

I've done some testing with a hand-toss model of the Viggen with positionable control surfaces and it seems that the ratio of down elevator to flap is about 4 to 1. That is, 40 degrees of flap needs about 10 degrees of down elevator. Which brings the question: Did you use elevons or separate ailerons and elevators on your Viggen?

Regards,


John