So I've actually worked on a couple of aviation projects in career as a biz dev person. A usual development technique is to build at small scale and then work y

So I've actually worked on a couple of aviation projects in career as a biz dev person. A usual development technique is to build at small scale and then work your way up. The problem is that when you get closer to 1:1 scale, new always issues come up with bigger challenges. You solve one problem at 1:5 scale, only to realize that doesn't work at 1:3 and the whole thing needs to be redesigned from the ground up. The annals of aviation history are littered with aircraft unable to move past 1:n scale.