From my experience of pulling draggy loads with heavy airplanes, I would steer away from any single cylinder larger than 50 cc because the vibration levels are high enough that it is tough on the airframe over an extended period of time. The 3w-106 has been giving me fits with losing the prop and hub until the single bolt-Ralph fix occurred. I would steer away from that engine also. I would suggest the older 3w-100, the DA 100 or the 3w-85 which are all twins. I personally had overheating problems and related component failure problems with ZDZ engines. I have not had any experience with other brands of engines.

Hope this helps. If you want additional details, send me a PM


Elson