RE: Formula for fast cheap plane
I'll bet that plane moves along pretty good. Instead of guessing about a planes' speed, it doesn't take much effort to find out how fast it really is going. All it takes is 2 helpers with cell phones, a stop watch and whatever fixed distance you choose. I use a 1/16th of a mile timing zone. The repeated clockings are fairly consistant with the mathematical guess work....there haven't been any "miracle runs" clocked so far by us.