Banjok is flying 3 at once and they're all tri planes.
MM
If Dan is flying 3 models at once on 3 separate lines than he is probably imitating Jim Walker who had the 3rd handle on a helmet and the toggle switch for the 2 speed point system was worked with a 2 way switch from the helmet on a rod in front of his teeth.
Without throttle control I'd say young Dan is even more energetic than anyone realized.
Perhaps I'll get to see it myself when the Philly Flyers visit us next month