Know what I notice most about that clip... FIRST, there's 30 or 50 feet of runway behind the airplane before it starts accelerating. I'll bet Dr. Einstein would have loved to have had that extra 50 feet a few seconds later. We all remember the old saying about "runway behind you".
Second, the neurosurgeon didn't bother to use flaps , which would have given the airplane more lift AND some potentially life-saving wing twist.
And I also noticed that when the pilot horsed back on the yoke to get it through the trees, those Stinson wing leading edge slots are likely the only thing that kept it from dropping a wingtip and cartwheeling into the water.
That clip should be used as a sales tool by the VG manufacterers... "Got Lift?"
Actually, I'd like to use that clip as a sales tool myself, to be honest. Looks like the pilot was too preoccupied to ... oops... belay that... one or two of the natives will get restless if I finish that sentence