SSD
Most Gliding Clubs have a fair sprinkling of members who are involved in power flying as well. Nothing wrong with improving the performance of a good airframe to produce a superb Tug. I have flown behind a Gypsy engined Chippy and the performance was marginal. I believe the Chippy was originally designed for a Lycoming but they had all these Gipsies no-one wanted. Would He Who Knows step forward please.
Regards
Mike W