Hi Dave, Ran my Super Tigre S.29 today. Mine is the version that came after yours with the square head. It also has the less restrictive muffler that was used before the silent muffler. On Omega 5% with some castor added I saw 15,200 rpm using a MA 9X5 prop. I have been impressed with all my Super Tigre/Como engines I have. Your ST .40 Bluehead in the other thread looks great.

Best regards, Bill