ITs a 2 stroke, not a 4 stroke so a 14-8 would be way too much prop!!! I tried a TH 75 on my Kaos 60 to test the engine. It proved to be very reliable and has gobs of power. Thats why I selected it to pull my Stuka 60 around. That was 3 years ago and its still pulling like new and it has never dead sticked on me!! I like the engines so much I bought 2 more and don't even have planes for them yet!! My opinion, its the best 60 size engine you can buy!