RE: U-Can-Do & OS .61 FSR Prop Question
Scott- The OS-61FSR was/is a great engine! I bet you could get away with a 14x4W APC or Zinger maybe?, even my OS-50SX can turn a 13x4, so the 13" is a tad small and my G-90 spins a 15 or 16 incher... A 13x6 would be a good load but crappy for 3D-
I am assuming you want 3D style perfomance-- ?