Friday, October 14, 2016
Semroc (Estes) Starship Excalibur Build, Part 16, Rear Shroud Prep
The single kit shroud was scanned, copied and printed on some 110 lb. card stock.
Why so many?
I always make up three or four and use the one that fits the best. The slightest difference in the glue tab positioning can make a better fit over a body tube.
This one is different. It only has to fit well over the BT-20 engine mount tube. The wide end slips inside the BT-55 main body. The wide end of the shroud butts up against the lower centering ring on the engine mount.
TIP: The pattern shows a rectangular engine hook relief slot. The sharp corners of a slot like this can tear. Punching a rounded slot will be stronger.
Use the rotary punch to make the hole first. then cut the sides with a sharp knife and strait edge. Enlarge the inset picture to see the cuts.
Notice the punch is made deeper than the original box end. I didn't think the slot depth would allow enough movement of the hook when inserting and engine. After making the first two shrouds I had to make two more with an even deeper slot punch.