Here's how the fin fits against the lowest section when the root edge three layers are squared up.
To fill the gap the instructions recommend a glue fillet after the fins are glued in place.
Here's after I compensated for the curve of the tube. The fit is better, a smaller root edge gap below (left of) the molded ring.
On some sounding rockets (see below), there is a small gap where the fins root edge is bolted onto the rocket body.
You can get a stronger tighter joint, but it's tricky to do -
Glue the layers up so the center tabbed piece is very slightly recessed, out from a regular flat root edge.
I wouldn't try this unless you have patience.
Don't laminate the fins until you read tomorrow's post . . .
Here's a picture of the real BB XII from the old Meatball rocketry website.
Notice the gap where the root edge is bolted onto the rocket body.
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