Originally Posted by bra67240

As you have seen in this thread, the most popular engine for the 3D Mayhem in the YS 110 or 115. It is one of the first planes in this size range to be truly 3D. I have owned and flown planes with the OS 75. It is a very powerful engine but the 4 stroke and gas powered engines are a better fit for this plane. I would not question the power of the OS 75. I would think it has easily enough power for the plane. I'm not sure of it's 3D characteristics. Now that Sig has dropped the Mayhem, there are probably a few old Mayhem lovers out there willing to pay a fair price. This plane is one, that if I'm taking two planes to the field, the Mayhem was almost always one of the two.