RE: Twin Otter 125inch wingspan
Hi Tom Those are Master 16x8on the OS200's. This combination provides plenty of power at 32 lbs static thrust on the 36# plane. I never have been able to get them to run as well as all my other OS engines have run. Both change speed and mixture during flight and gave me fits landing with engine speed changing on final and during flight and always did even in the Decathlon test plane. If one can fix this, they would make ideal size and power set up for the plane at least up to 45# but for me I will replace them this winter with 26CC gas engines probably Evolution which I get along with well. I just didn't get to the lower fairings and other finish details yet . I make the lower fairings upper and lower 2 piece and bolt together over the wire landing gear with no problems just do not attach lower and upper fairings together as per the full size plane