For the wing loading you gave, Xfoil sez that the 7037 has about 10% higher usable CLmax than the MH32. But the MH32 has a lower Cd at higher speeds. But as Don Stackhouse pointed out, the two airfoils want different wing loadings (different chords) for a meaningful comparison. If you assume the MH32 wing has the same span but a 10% bigger chord than the 7037 wing, then Xfoil says the two wings are almost indistinguishible in both thermalling speeds and penetration. The appropriately scaled polars are right on top of each other. The larger MH32 wing area almost exactly cancels its lower Clmax and lower Cdmin. The larger MH32 wing has more volume and skin area normally means it may be heavier, but on the other hand the larger thickness means the skin can be thinner which may compensate. Still may be a toss-up. In reality the quality of construction will obviously have a significant impact on the relative performance. This is tough to quantify. - Mark Drela RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
