The dihedral has got to cause a roll when yawed, and left yaw is what the glider will see as soon as the towline tightens up.
Yes, I agree.
There's absolutely no way a towed model will stay stable without control.
My guess is it would corkscrew like a kite. The second pilot is necessary as is the lines.
I'm saving that glider drawing, thanks for that.
With my software, I can scale drawings easily. I only need the outline to build, so I do a perimiter trace and enlarge the drawing to any scale. My cutting machine will hold a special pen. Acts like CAD.
I traced the Tiger Shark plans and enlarged them so I would have a 72" model. I used an Astro Hog wing but made many changes to it. This was for RC. I may CL it now.
I did have a Thread on the Tiger Shark, but the R/C guys didn't know much of it, or have real interest.
Here's a photo or two. You can see the Tiger Shark fuselage on my old bench.
Charles