I need some advice. I have a Comanche - 3 with a crimped body tube. Should
I remove the entire crimped section or cut tube in half at the crimp? I was
planning on using a spent D motor casing as the coupler. Any advice is
change seveneleven to 711 to reply
If it's a small crimp, slide an Estes coupler inside of the tube to
act as a reinforcement. If it's a major crimp, cut it back to "clean"
tubing and replace it with a coupler only, or if the crimp is larger,
a section of new tubing.
I'd stay away from using a spent D as a coupler. It's overkill and
waaaaaayy to heavy. On a 3-stage rocket, weight reduction is
important. If you don't have any couplers, use a piece of the crimped
tubing. After slitting and straightening it out, cut a small piece off
of it lengthwise and reroll it to a slightly smaller size. It doesn't
have to be pretty since it'll be hiden inside of the rocket.
NAR 71503 Level II
God Bless our peacekeepers
email@example.com (Mark Simpson) wrote in
You can also use CA to "re-stiffen" the tube at the site of the crimp. Let
it soak in and dry, then sand it smooth.
I wouldn't use a spent D for this; it would constrict the tube and could
lead to the wadding or chute getting stuck at that point.
Where is the crimp located? If it's near the top of the tube, just cut off
the tube flush. If it's farther back and you don't want to spoil the looks
by doing this, cut the crimped section out, plus about 2" extra. Use this
extra piece to fashion a joiner by slicing it down the side and removing about
1/8". Glue the two halves back together (use epoxy preferably, as wood
glue won't stick well to the paint on the outside of your joiner.
If you have any scrap BT-50 lying around you won't need to take out the
extra bit to make a joiner, obviously.