Baker here are the links to engines made for the Patty. Good luck. If I left any other engine out -- it was not intended to offend anyone who may have another engine choice for the Patty. I have made many mistakes in my lifetime and will make many more in the future (I hope) but I have learned to make the best of a poor choice.

http://www.bmeengine.com/html/50.htm

http://www.desertaircraft.com/da50.html

http://www.brisonaircraft.com/revolution.htm

http://www.aircraftinternational.com/ A little heavy.

http://www.rcshowcase.com/html/engines/zdz50.html