I would go with the os 61. I am no way an expert about this but in my opinion the 72 just might be a little under power. I could be wrong. I wouldnt want to take a chance on such a nice plane.
ORIGINAL: Kansas Twister
My next ARF purchase will be the Great Planes 60 size Shoestring. My inclination is to power it with a Saito .72 4S or an OS .61 FX 2S; would the OS be quicker and still be suitable for pattern type maneuvers?