Estes Odyssey #7235 Build, Part 10, Cutting The Tube & Fins Slots

The large marking guide wrapped and fit the large tube perfectly.

Notice that only three slots are cut through the tube wall (TTW), the TB, TC and TD slots.

The other long rectangles, TA and TE are only to be marked with a pencil. The TA and TE rectangle markings are for the smallest surface mounted fins. 

I'd recommend cutting the end curves before cutting the thru the wall slots. The tube is stronger before the tube slots are cut.

As recommended by John Boren - use a new sharp blade. Don't try to cut through with a single pass. It should take 3 or 4 cuts to go through the tube wall cleanly.

I used a metal ruler edge for straight lines.

It's not easy to hold a long metal ruler still when making the cuts.

The ends were cut by punching the tip on one side, then turning over the tube and punching the other corner - meeting in the center.