This one's still going? Wow.....

Just to add to my free flight study. I'd forgotten one little item of demonstable evidence that really proves that the contest free flights are flying with a very positive tail lift.

To add turn in the glide without using trim rudder, and thus affecting the climb, we tilt the stab. To get some right turn the stab is tilted right tip high left low. This points the upper surface off to the left but the model turns to the right. This only works because the stab is lifting positively and the tilted lift component is towards the left, just like some right turn tab.

If it was negative then this same tilt would have a component pulling to the right and causing a left turn.

I'd already figured out the other explanations but in case anyone out there needed a final bit of proof.....