Wayne Kellner, designer of the Demon, did some great work.
The fin plate trim pieces were a clever design element.
Before cutting them out, score the fold down the center dashed lines as before. These are printed on thinner paper so go easy.
Again, use the dull tip of a butter knife and straightedge. Don't cut through the paper, just make a pre-fold crease.
Don't hit these with the spray adhesive, on pieces this small it's easier to use white glue.
With a straightedge and sharp knife, cut out the plates. There are extras on the print.
Fold them down the crease you made.
Simply apply a thin coat of white glue on the back and center them into the root edge of the fin/body tube joint. Tweezers will make this easier to hold onto.
These plates will also strengthen the fin joint.
Nothing left on this one except to glue the yellow square around a launch lug then glue that into the root area of a fin.
The original big Demon had two lugs, one in the front and one in the rear. On a model this size, a forward lug really detracts for the look of the model. A single rear lug should be fine.
The fin alignment lines on your PDF print were moved slightly rearward from the picture here. Your model will be that much closer to an actual downscale than this first prototype.
It's Finished!
This next launch it should fly with a 35 year old MPC Minijet engine.
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