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Old 03-03-2019, 02:19 PM
Les Les is offline
BAR 13790
Join Date: May 2008
Location: Johnson City, NY
Posts: 437

Used Titebond II to attach nose cones. I now have a sealed system!!!

Weather permitting I will do an ejection test next weekend.

I need to do some cleanup and attach fins, but that will wait until after the test....
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Old 03-09-2019, 01:06 AM
Les Les is offline
BAR 13790
Join Date: May 2008
Location: Johnson City, NY
Posts: 437

Jerry - I owe you an apology

I took the rocket (without fins) and set up a static test with a 30" thin mil chute. Had to do some jury rigging to install a 24mm load (CTI E31). CTI states their 24mm loads have 0.6g of BP for the ejection charge. I strapped the rocket to some benches, and 3 - 2 - 1 - 0 and nothing. Bad ignitor. Replaced it and tried again.

So what happened? I expected the charge to go off but the cone to stay on, or even if it came off the chute to stay in the tube.

What really happened? The chute and cone came off quite energetically!

Now the cone is a bit on the loose side, but I think good enough to satisfy a safety inspection.

I did not try a 29mm (which comes with 1.2g of BP). I guess my options are to fly with 24mm or to use a 29mm and remove some powder. I can also run a test case with a 29mm - I ran out of time today....
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Old 03-09-2019, 06:47 AM
Jerry Irvine's Avatar
Jerry Irvine Jerry Irvine is offline
Freeform rocketry advocate.
Join Date: Jan 2008
Location: Claremont, CA "The intellectual capitol of the world."-WSJ
Posts: 3,531

U.S. Rockets motors use 0.4-0.6g BP 3F depending on diameter, but this refers to 24mm, 29mm, 38mm motors SU and RL.

I understand CTI and AT include more BP than is needed. I suggest using a used pill bottle to collect extra BP for secondary deployment charge use. Separate by 3F and 4F please. Use ONLY BP not "alternatives".

Started the first batch of production Tridents. Just a couple parts remaining and on the way from a vendor.

One of our vendors, BMS is on a 7 MONTH lead time right now!!
Exemptions not regulations. Please support DOT treating slow burning solids as not subject to HMR. 2015 NAR President declines!
U.S. Rockets instaship. Please buy some rockets.
The O administration believed in tax, spend, borrow, fine, mandate, monologue. D voters will soon be very happy with the election outcome!
Model rocketry is as safe as safe can be defined in human existence. Bow and pray: GH Stine, Orville, Vern, Lee, Lonnie, Carl, etc. No, really.
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