Re the SAH-1, I have flown the 120 hp version (G-BVNU) and it is a truly dleightful aeroplane to do aerobatics in, only real grumble is a lack of climb performance, but once up at a suitable altitude it is lovely. By all accounts the 120 hp version a better aerobatic aircraft than the 160 hp version due to better weight balance with the 120 hp engine.