"Not surprising. The 10% SD8020 is too thick for most glider tails. A slab airfoil is just plain bad. Both will surely have nonlinearities. A 5-6% thick airfoil with the max thickness point well forward at 20-25% chord is much better, since it is immune to most hysteresis effects. With such a tail I'm sure you'd see much less effect when changing decalage. -- - Mark Drela" Now that you have wetted our appetite what is your suggestion for that foil that I should be using?. Is it a special item or do I have it on file and don't even know it? Rick RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
