10-08-2017, 03:44 AM
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Master Modeler
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Join Date: Jan 2009
Location: Fairbanks, Alaska
Posts: 6,507
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Quote:
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Originally Posted by Jerry Irvine
Most of your non-consumer wishes already came to fruition. The original smokey sam was in effect a nozzle less motor. It had a casing but it was weak. Spiral wound phenolic treated tubing. It had a foam nose cone and tail unit. Dirt cheap. Vulcan was one of the vendors. I think Navy was the primary user.
Our nozzle less motor had two parts:
1. Casing
2. Propellant
Like an A10-0T it used propellant as the bulkhead and the near zero thrust on the bulkhead burn acted as a delay. They were all about 2-3 second effective delays.
If you have a heavy 13mm motor rocket you can use a A10-0T with a 1/8-1/4g ejection charge added with a paper cap inserted with the rear of an x-acto knife. I suggest 3G or 4G BP. It is easier to dispense it volumetrically than by scale.
Tech Jerry
The propellant it used is not listed on the U.S. Rockets "reads" page.  |
I don't modify motors, but competition flyers in other countries often do. Also, a jet motor market niche has opened up, which you could fill with scaled-down Smokey Sams. Dr. Z (Dr. Jan Zigmund) was forced to cease production of his Rapier jet motors (paper-cased, deliberately "weakly-formulated" zinc-sulfur rocket motors) after the Czech government changed their classification from "smoke device" to "firework," which triggered onerous requirements that he couldn't overcome. |