I had some time and managed to finish this last night. At least for a glide test.
To get the curve, I glued in the spars inner bottomed half. Let that cool. Then I glued the outer bottom, the front edge, and top of both spars, then filed the wing over and weighed it down on the support. Like so:
When fully cooled - minutes. When complete I noticed the curve sprung back by about half. Oh, note where I put score lines on the inside (50%, 65% 80%) and removed strips of the top paper about a 1/8" wide, to relieve the compression. Trim any spare ends to the 45° end treatment and glue on the edge fins.
It was time for the fuse.
Basic 4 panel construction. I trimmed the inside rear of each side panel to accommodate the rear fin. Please note, this space is thin! You cannot fit much. I also added an extra piece of faom on the rear trapezoid at the fin to build up the height to match the wing. This did two things. 1 provides better air flow, give a surface for friction fitting the wing in. Lastly the very. Stab was flimsy, and reinforce on each side with a 1/2 length of bbq skewer imbeded in the side panel 1/4".
I had to adjust the control surfaces by approx. 1/4" each to accommodate the fuse width. Now all that was left to test it.
Looking good.
Testing
This portion went poorly. I flew it once for fun without nose weight. And it fluttered back-flipping to the ground. As expected it is a very tail heavy wing. So I started adding weight.
And more weight
And more weight.
I have nearly $2.50 in nickels pennies and quarters (8each) dumpped in the nose just to get it close. The CG marked is just in front of the front spar.
When given a moderate toss it would fly for about 20' then nose in -HARD. It's good I taped the fuse bottom and nose to protect against nightly dew. I had 1 toss the was about 50' before nosing down.
At one point I attached a steel drilling tooth to the bottom at the wing front. (I think it weighs 1 lbs) just to balance it.
I had a similar difficulty with the Alula clone.
I stopped when cracking the fuse in half a second time with little glide success.
Possible Sources for Adjustment
I checked the wing airfoil, and I don't have any reflex built in like the section prescribes
I'll try and get footage