I'm always apprehensive about using pre-made parachute shroud lines.
These broke with a good tug!
I cut them off the chute and replaced them with #10 embroidery thread.
Plastic nose cones and adapters take longer to dry between paint coats.
I waited three days before spraying the yellow and the paint wrinkled!
Sand smooth, wait four days and spray again!
Here's the new Estes self-adhesive shock cord mount.
It's a simple knot, I left a loose tail for some extra insurance.
I'll be checking the adhesion of the mount after a few flights.
Older rocketeers might remember the problems with the Centuri self adhesive mounts -
Initially claimed to be "permanent", they did loosen and pull loose over time. Later kits would include an addendum to the instructions reminding you to burnish the fastener between launches.
Granted - in 1971 we didn't have the 3M tape that is on the back of the new Estes shock cord mounts. Time will tell . . .
I'm guessing that the problem with those self-adhesive shock cord mounts is that exposure from heat (from the ejection charge) was loosening the grip of the adhesive.
ReplyDeleteThis reminds me of what happens with the adhesive on masking tape from exposure to heat -- it's apt to turn goopy. If there's no pressure against the tape holding it against the surface -- it could "let go". If there's pressure holding tape against the surface -- a bit of the adhesive could ooze out the edges, leaving a bit of sticky residue.