Guys ... I have a YS61 (heli engine) that I was told can be used for a plane set up. I read somewhere to do so it will need some form of adapter that can be purchased. Can anyone assist me please? Do I need some adapter to lengthen the shaft or perhaps none is needed ... thanks!

you need a prop drive to slide over crankshaft, then use normal prop nut

Ducted fan engines have the same problem. The fix is easy: http://www.truturn.com/faq-05.htm a short shaft adaptor. You can e-mail or phone your questions to them and they are happy to help.

Thanks for the assistance guys!