>>1454902Velocity V-Twin has the same problem, it's cruise performance with two 160 HP piston engines is 17% slower than a Velocity XL with a single 300 HP engine with similar characteristics. And it tries to condition the airflow behind the body with a more refined solution than the Starship.
Both still have insane performance for an experimental piston kit airplane.
Even the single engine version has shockwaves being generated where the propeller and the wings meet.
Aerodynamics is a fucked up thing, the biggest improvement of the last years was literally bending the tip of the wings a little and nobody believed it would work.