1018Re: [GPSL] Last Weekend's ISU Flight
- Oct 5, 2004
> Our students used what appeared to be colored duct tape, but we weren't as concerned about weight. Is the Uline tape available at hobby stores?It is. HobbyTown in boise has part of a wall dedicated to the stuff. It's a very thin
> Can you describe (or post a photo) of your three-line suspension?I'm working on it between classes. It's basically a spreader ring for a parachute, but
flipped upside down. I started with a bearing swivel and tied three 50 pound test
spectra lines to it and sealed the knots in heat shrink tubing. I took a 6" diameter
needle point ring and drilled three equally spaced holes in it. The lines from the
bearing swivel drop through the needle point loop. I slid a bead on each line and
then tied a large knot in the spectra. The knots keep the beads from sliding any
farther down and the beads keep the needle point ring from sliding down. I'm now
working on tying bearing swivels every 18 inches.
A BalloonSat needs to have three tubes glued into it. The styrene tubes I'm using
are very light weight. I cut grooves into the foam body of the BalloonSat for each
tube before I assemble it. To make the grooves, I sharpened up a plastic tube and
twisted it into the foam to cut a cylinderical groove the correct diameter. I also cut
smaller diameter holes in the foam for 3/16" wooden dowel. The dowels protrude
from the BalloonSat by about 3/4" so I can rubber band the hatch on the BalloonSat.
After hot gluing the BalloonSat together, I cover it in tape (I used black for thermal
concerns) and then punch out the holes in tape covering the BalloonSat airframe.
Then I hot glue the tubes and dowels into place. I'm also making tape labels with my
name and phone number.
To fly the BalloonSats, I connect the swivel in the suspension to the bottom of the
last module in the near spacecraft. The three lines from the suspension are dropped
through the plastic tubes of each BalloonSat and the BalloonSats are pushed up to
the level of a bearing swivel. I'll then run a jump ring through the bearing swivel so
the BalloonSat can't slide off.
I'll get a digital photo and send it this week.
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