ORIGINAL: BMatthews

Redc, that is sort of what free flight models try to do with their lifting stabs. Well that and thanks to the stabs being positively loaded due to the rearward CG's it helps with the lift and all.

But as Dick says it only works over a fairly narrow range of speeds. I've seen models that flew fine for a few flights suddenly lawndart themselves when a gust or deeper than normal stall got them flying too fast and the stab lift overpowered the wing. I even had this happen with a rubber powered P30 design of my own. Undercambered airfoils on wing and stab. In normal flight the model was just the right amount of pitch stable and would recover nicely from mild stalls. But if it stalled deeper or a gust pushed the plane into a dive or spiral and the speed built up a little the stab overpowered the wing and it was LAWN DART TIME!..... well as least lawn dent time. A 50 gm model with a 9 inch freewheeling prop on the nose can only do so much damage after all.... Granted these models fly VERY close to the neutral points but it's a good example of how stab lift can be vairiable in it's balance with the wing. For my P30 I built a new stab with a lesser camber flat bottom stab and re-trimmed to work with the same CG and all was well in the pitch department from then on.