In the latest episode at about 6:20 he describes how, in the first flight, the canard stalled right at rotation and continued to alternately stall along with the main wing stalling. But moving the cg forward fixes this.......and over to you in the booth, Marc......
Sigh. _IF_ there were any main wing stalls going on (which there most certainly are not, unless PM has a different definition of stall than the aerodynamic community as a whole) then moving the CG forward would help to prevent main wing stalls. Aside from stability concerns, preventing main wing stall (deep stall) is the second (and possibly MORE important) reason for the rear CG limit location on canard type aircraft.
If the Raptor had had a main wing stall, the plane would have crashed, given the low altitude at which he was flying and the experiences of everyone else that's had a deep stall in a canard type aircraft.
As far as the CANARD airfoil stalling, yeah, no. It isn't. As I pointed out in my comments about his first flight, since he's rotating at a speed ABOVE the slowest speed he was able to fly, and since there's no discernable drop in the nose of the plane, he can't be stalling (at 1G) at a speed above the lowest speed the plane can fly. PM's looking at relatively stiff and too long tufts made out of the wrong material, seeing some reverse flow near the trailing edge, and thinking that that implies that the airfoil is stalled, because there's a bit of separation going on. I'll just say that his lack of aerodynamic understanding is fairly robust.
On my plane, with a Roncz canard on a COZY MKIV (but folks have seen this on GU canards on VE's and LE's and COZY III's as well) you can fly through some rain and have water bead up on the TE of the elevator and just sit there. You're flying at 100 - 140 KIAS, but there are water blobs just dancing around about 1/2" fwd of the TE of the elevator. WTF, you think. All it means is that there's a bit of separation there and a small amount of reverse flow. Price of doing business with these airfoils. It is obviously NOT an indication of canard stall, as I can fly my plane at the rear CG limit down to about 61 KIAS.
PM has never had either the canard or the main wing stall on him in the Raptor, and he should be extremely happy about that fact. If the canard stalled on rotation, the nose would have slammed back down onto the ground, possibly breaking something. And if the main wing had stalled, particularly only on one side, as he surmises, he'd have been sideways and rolled up in a ball on the ground.