It's a dangerous airplane. Aerodynamically, it's a very unusual airplane,

But the problem is, if you lose an engine on takeoff, you cannot get to 150 knots without descending. And if you do it at takeoff, there's no place to descend ... So you're going to crash,

I guess we have forgotten, with all the successful flights, how dangerous it can be.

With ailerons, you have one aileron goes down and one goes up and what that does is redistribute the lift on the wing, ... The downgoing aileron increases the lift, the upgoing decreases the lift but the overall lift of the airplane is unchanged.

The only airplanes I know of that use spoilers for roll control alone are some military aircraft,

Some of those pilots were very high-time pilots, with the best airline transport rating, which is the highest license a pilot can have, ... Some of them were only transport pilots with many thousands of hours of flying time that could not manage to fly this airplane.