I am not too sure the planes would be much smaller. I remember Mr. Prettner flying a full 2x2 all composite patternized Extra 300 back in 1995. He had two examples built: one with the mighty OS 120 SuperCharged and the other one with a gear (or was it bel) reduced OS Hanno Mk2 .61 two stroke. The latter swinged an Asano Special 16x12 wood propeller. He was also testing an all wood 2x2m plane losely based on the Cranfield A-1 powered by the OS120SP. He was training in Italy for the Japan Worlds to get used to the heat, humidity and air density (same height above sea) when he collapsed and broke the neck. I believe he never returned to competition after that.