I see these "pressure motors" as being very passe' and a poor substitute for real rocket power that BURNS fuel.
They were obsolete when first introduced.

__________________
When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, TURMOIL, FIASCOS, and HAVOC !

Bill the NAR did have a Cold Propellant Model Rocket code for several years while vashon and then Estes/Vashon motors were available.

What's funny is when the Vashon motors 1st came out, the NAR immediately banned them because of the metal motor material. So Vashon tested/demoed their motors before the FAA
and the FAA said, no problems here, and shortly thereafter the NAR did a complete 180 and embraced the cold propellant motors with Safety Code:

http://modelrocketbuilding.blogspot...afety-code.html

The one I had as a 13-14 yr old was pre-Estes....I had great difficulty getting the electrical ignition system to work. So I usually just pulled the pin while the model set on the launch pad. I would also pull the pin holding the motor in my hand......so to me it was just a play toy......

when pressurized it grabbed the parachute tube pretty tightly. the pressure expanded those spring clips outward and they grabbed pretty good.

Charles Green, one of the 2 founders died in 2009. Alan Forsythe, his partner is still kicking at 85+.

EDIT removed poor pdf and replaced with much better photos

https://airandspace.si.edu/collecti...sm_A19930631000

https://airandspace.si.edu/collecti...sm_A19930655000

Attached Thumbnails

       

__________________
"Old Rocketeer's don't die; they just go OOP".....unless you 3D print them.

The motor for the "Land Rocket" cars was ALL aluminum, including the Nozzle. It also looks to be 3/4" +/- in diameter.

Dave F.

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Interesting that this turned up on eBay this morning.

Link: https://www.ebay.com/itm/3039788944...AAOSwyJxgirt w

If you have some old birds one might could get them back in the air.

Earl

__________________
Earl L. Cagle, Jr.
NAR# 29523
TRA# 962
SAM# 73
Owner/Producer
Point 39 Productions

Rocket-Brained Since 1970

Grab it, before someone "rats it out" that it's R-12 Freon !

Dave F.

Oh, one can get R-22 freon in 5, 10, and 20 pound cans on eBay right now.

Earl

__________________
Earl L. Cagle, Jr.
NAR# 29523
TRA# 962
SAM# 73
Owner/Producer
Point 39 Productions

Rocket-Brained Since 1970

But NOT R-12....
One more idiotic ban by the mamby-pambys.
This ban was not nearly as bad as EPA Administrator Ruckelhaus banning DDT in 1972 against the advice of the entire EPA scientific panel. DDT was banned by alarmist BUNK/BOGUS science.

__________________
When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, TURMOIL, FIASCOS, and HAVOC !

Actually, eBay IS selling R-12 ( I was surprised ) !

https://www.ebay.com/sch/i.html?_fr...ltering&_sop=16

Dave F.

All at RIPOFF prices too.
More EPA nonsense. When the little cans got banned, the price per pound tripled.
I'd rather ban the EPA.

__________________
When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, TURMOIL, FIASCOS, and HAVOC !

NASA and other space agencies don't think so--cold-gas thrusters (usually using nitrogen, although JAXA has flown a combination xenon ion drive/xenon cold gas thruster system fed from the same tank, and the MESSENGER Mercury orbiter used its helium pressurant in its thrusters after the propellant was all burned) work just fine, especially in a vacuum. The spacecraft need not be small and lightweight, either; Skylab used nitrogen thrusters, and so do the reusable Falcon 1 first stages. ALSO:

In Alaska (and many other states), "Red Flag" days--when hot, dry conditions make flying regular model rockets an exercise in madness (and illegal, too, on such days)--are common. (Even G. Harry Stine's model rocket club once accidentally burnt an 11-acre grass field, when a glowing igniter fragment landed in the dry grass, and within seconds the wind whipped up a fire so large that they had to call the fire department!) Cold Propellant and Coldpower rockets not only *aren't* a fire hazard, but they can even, in a pinch, be used as fire extinguishers (if, say, someone nearby dropped a still-hot cigarette butt).

__________________
Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see:
http://www.lulu.com/content/paperba...an-form/8075185
http://www.lulu.com/product/cd/what...of-2%29/6122050
http://www.lulu.com/product/cd/what...of-2%29/6126511
All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com.
NAR #54895 SR