RE: Using a bushing engine for a pusher?
I first used a Magnum GP15 on the tail end of my Sig Tri Star. The results weren't good. After two flights there was very noticible wear, with the drive hub pushing into and wearing the engine case. I switched engines to an MDS 18 and have not experienced any problems because of the configuration. Problems because of the MDS, yes .... but its much better now. [8D]