The seat angle in the 55% is 35 deg, way too flat. That's what it took to get me into the 55% mock-up. Mostly to get my shoulders under the canopy sill. I am 5"10 and weigh about 200 lbs. I measured a Varieze, a single place glider and a German plane called a Speed Canard and they were all around 45 deg. Having made a several hour flight in the Speed Canard I found it quite comfortable although a slightly more upright angle, such as it my Sonex and Onex, would be better.