With the power provided by the K.61 engine and light weight of the airframe it will pretty well fly any direction you want because the power to weight ratio is so high. I expect the K.61 has twice the power of my old 70s vintage Veco 61s. I sometimes wonder if the fuselage and wing are just along for a ride with the engine. If you have ever flown a 5 ½ pound aircraft with clean airframe that is powered with a strong 61 you can picture how it flies, very fast and ballistic performance. Of course because of the light wing loading it flies slowly very well too. But keep in mind it was designed before knife edge flight was a big deal. Usually aircraft that are aerodynamically good at knife edge have the vertical stab and rudder positioned lower and or centered on the thrust line of the fuselage and look more like the old Eyeball design.