Ok, in my case i'll use for my old airboat 1-1/2 spinner (os max 40 fp and 10.5x6 inch prop). i will use spinner only for engine start not for good looking. (until now with my finger).
Now i know something more about rc.
Next step is plane - s.p.a.d. - debonair. (price in eu is so high for trainer and other models - no Les than cca 100eu = 120 usd) maybe less but without more parts like us trainer packs.

Thanks again Mike and good luck

Realdo