I think the idea is a soft spinning rotor (like a spinning parachute canopies) The mechanism looks like it is an attempt to change the shape of the canopy and the frame around it is just a rig to hold it in place to prove the concept. Anyway that's my guess.
He says the number of sail antisail changed. But the previous design had the same number i think just different length. Sail/anti sail was previously mounted midway to the wingtip/root via socket made in the wood and glued. Now its mounted to the square tube.
Well I just bought the plans. Just $4.00 instant download.
The woodhopper plans consist of 6 pages. Not really complete. They say "for study purposes only" .
No materials list. Just low quality diagrams.
(BTW the diagrams do show the flightstick in the lower position.)
Weedhopper comes with...