Honey, there's a strange rocket at the door...
March 17, 2002
Main fins get tacked
Early in the day, I installed the motor mount in the airframe. I
reinforced the forward centering ring using my own technique that
I'll go into later. The foamcore templates did their job. I had
originally intended for the templates to serve as a cradle while
adhering the six fins. However, the templates were a lot flimsier
than I expected and I had to resort to using a Robart
Stand to support the weight of the rocket. The paper layer of
the foam would also tear away far too easily (even 3M Magic tape!).
So, I reinforced the edges with packing tape.
I bet it's trying to sell really expensive candy for a high school
band trip or something.
March 18, 2002
A number of us got together for lunch to chat about rockets. Afterwards,
I stopped by Texas R/C Modelers for supplies.
Well, maybe if we just ignore it, it 'll go away.
Is that dental floss?
Yes, it is. PML's instructions suggest:
Make 3 or 4 tabs using cellophane tape as shown above to aid
in removing the ring later
This just hasn't worked for me. The tape tears and I end up prying
the centering ring out with a knife.
Instead, I've found that Glide Dental Floss is almost flat as tape
and much stronger. It's wider than most dental floss, but it can
still cut into the plywood centering rings if you're not careful
about how you align it with the wood grain. I use mint or cinnamon
Note: The best way to avoid putting that shockcord under a fin is
with some alignment marks. Note the red lines on both the airframe
and motor tube.