This is a new Nelson .36 model airplane Combat engine with new Nelson plug. These engines are no longer available so is your chance to get one. They rarely show up on ebay, especially brand new, never mounted, etc. The Nelson 36 will turn over 21,000 RPM. I think these are the top engines for free flight and Control line. Do not miss your opportunity. I am selling a few other new Nelson engines, so please look at my other auctions. Note in picture 3 the small marks near the left mounting lug. It had this mark when I bought the engine new. Shipping is $5 in the USA, (will ship international too). I ship via Priority Mail. Funds to reach me no later than 7 days from close of sale. Thanks and good luck.