Got the roots and tips mixed up. Thicker root, thinner tip for stall margins and more efficient strength/weight distribution. And most 'competitive' 2Ms would be closer to 8% than 10%. Usually, greater thickness = more tolerance of a wider range of AOAs. Thicker is bad down in HLG ranges. Thicker is always better from a structural standpoint. One of Airbus' greatest wins with the A330/A340 class was a successful attempt to create an aerodynamically good section which was optimized for deep thickness. This way, they were able to keep a high AR while maintaining large volume for fuel while minimizing structure weight. Make it thick and the shape does the work instead of the structure. Even an extra 2% in thickness gives great benefits as far as more strength for a given weight. I think my next go-around with glider design will try hard at optimizing for a slightly higher root thickness. Not the easiest of tasks when hovering below 50K Re's. Derek Back to the patio cover... RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
