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Preston: There have been lots of SS Nelsons, both Q500 and Q40, on EBAY. Nelson and Jett released a Long Stroke version and effectively obsoleted the old engines. They have been selling for anywhere from $150 to 250 on EBAY. Ask on the NMPRA.org web site you might get some direct help. You...

Preston: The current crop of AMA pylon engines fall into three categories. The first and slowest is the 424 class Q500 that uses a standard Q500 (can’t have composite wing or tail) airframe with sport 40, usually Thunder Tiger Pro 40 available for around 80 bucks. Engines must be stock with...