Barspool! I like that name. Can I borrow it?
It is heavy (20 ounces) but thats not a concern as it is not made for altitude and its not tumble recovered. A 24" chute gets ejected from the top tube and is held fast by a tubular nylon shock cord securly anchored to the top disks.
The design was based on the materials I had to work with more than any set rules. I only had 15.5" of motor tube and I still wanted to have a parachute compartment. The three dowels were added to keep the soon to be flown J impulse motor from crumpling the thin walled cardboard motor tube.
The tubing is just LOC 38mm motor mount cardboard tubing covered with foil duct tape. The disks are 3/16" thick Luan plywood cut out on a scroll saw. The biggest disk is 9" in diameter and the smallest is 3" in diameter. I had one 24"x24" sheet of the plywood and this was the most disks I could cut out without getting too overly concerned about maximizing the available surface area.
It flew perfectly straight on the G78 so I am interested to see if a significant increase in average and total impulse will change the flight characteristics.
Thanks for your interest.
LDRS30 or bust!