Designed for Estes B and C size motors, me bucko, I tried somethin' twice as powerful for t' first launch, me bucko, an Aerotech D10W-7. Well, blow me down! Blimey! It was a perfect flight at Snow Ranch. Avast, me proud beauty! Blimey! Photos: http://www.flickr.com/photos/jurvetson/6823040145