The reason was the Dazzler and Roar were fun fly planes. Not a lot of guys used them for sport planes. Fun fly events are a strange thing, you are doing a lot of things with them that gave them a short life span and some very serious crashes, or very hard landings if you like. They were designed to die so you didn't want to be installing any high end gear or engines in them. I used nothing but cheap standard servos and the OS .46 LA engines in any of mine. The Dazzler was the pretty boy of fun fly with the turtle deck and swept control surfaces. Both the Roar and dazzler were kits only for years and both kits were designed to be quick and easy builds. If I started building a Roar this morning at 8 I could be competing with it tomorrow at 8. The longest part of the build was waiting for the epoxy to set up. If you had a high dollar engine in your plane and one of the stunts was the target spot landing and you were going to over shoot your target I somehow feel you would give the full down elevator splat a second thought. If it came to be a win or loose part of the contest my plane would loose so I could win. No mater, I usually had several of the Roars in my pit for the next round if the contest director didn't have a one plane rule. A four stroke engine cost a bunch more then my complete plane, more like two planes. That's the why of it.