Important disclaimer: I know nothing. But, if 2 oz of ballast was necessary to be competitive in a recent windy HLG contest, and atlatls are potentially so effective, couldn't a small atlatl be attached as a ballast option? It would be part of the aircraft and therefore legal. Jeb Bushell Newtown Square, PA RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]