Neat way to launch. Sorta like them old German rocket planes back in the day. Not quite sure that it would be F.A.A. approved but I dont have my private pilots licence so I would not know.
I would however speak to the pilot of that plane and have them seriously check that hinge on the right elevator as that is a lot of rust on a hard point like that and would surely wreck someones day if it were to cut loose mid air.
Really cool to see that! It looks a little questionable but it works!
I thought You might like this video of me taking off and landing on a grass run way with my scratch built foamboard sea plane. I did not think I could land it on grass but it worked! and I was giggling like a school girl. The landing is at about 3 min and 15 seconds in.