after Phase 1 tests are done, I can add the gap tape commonly used on gliders. See https://www.craggyaero.com/misc1.htm

COrrection - DON'T use gap tape on the canard. See Zeitlin comment on the early wing shape:

Marc J. Zeitlin
Tehachapi, CA 93561
Posted September 29, 2008
coyote said: ... the gap may be used to blow the upper surface under high angle of attack to reattach the flow, then it may be detrimental to use some.

Bingo. The canard/elevator (GU or Roncz) is actually a slotted flap airfoil. The airflow through the slot/gap is critical to it's operation.


coyote said: If it is just a "mechanical" gap to allow the elevator movement, then it may be positive to seal ...

This is NOT the case.


coyote said: I would clearly clasify the GU canard in the second category ...

You'd be wrong.


coyote said: but i'm not 100% sure, and i feel lot of you guys may had the idea and have made the test already !

It is unlikely that anyone who gap sealed their canard (GU or Roncz) would be able to get off the ground for any flight testing. Removing attached flow over the top of the elevator would be a very bad thing.