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  #101  
Old 05-01-2021, 07:15 AM
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PaulK PaulK is offline
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Quote:
Originally Posted by Ez2cDave
Actually, eBay IS selling R-12 ( I was surprised ) !

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

Dave F.
Huh, maybe I should put up my cans of automotive R-12. I've been saving them to someday get an old Cold Power bird in the air, but don't know if I'll ever get around to it.
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  #102  
Old 05-01-2021, 03:26 PM
Moark Bill Moark Bill is offline
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Id like to see Estes follow the Disney movie example . Bring a few out of the vault every year for limited time and reproduce all the old lineup of rockets. This last year I built the current bring backs,Patriot,red max ,Nike X ,multiroc , Saturn 1B. So just keep the oldies coming!
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  #103  
Old 05-01-2021, 04:22 PM
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Quote:
Originally Posted by PaulK
Huh, maybe I should put up my cans of automotive R-12. I've been saving them to someday get an old Cold Power bird in the air, but don't know if I'll ever get around to it.


Do cans of R-12 have a shelf life? Just wondering.
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  #104  
Old 05-01-2021, 09:24 PM
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As long as the cans stay sealed, there should be no finite "shelf life" for R-12
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  #105  
Old 05-03-2021, 01:16 PM
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Quote:
Originally Posted by tbzep
Yes, but only in an upright. Flights are too short in a canister. They get really dusty in there unless you put a new bag on first.
I only use a broom and dustpan...
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  #106  
Old 05-03-2021, 01:24 PM
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Quote:
Originally Posted by Ez2cDave
I found some highly-classified images of the propulsion unit for the U.S.S. ELECTROLUX . . .

Dave F.
That was ours, too--we even had the braided hose re-done after 30+ years of service made it "ratty"; the rest of it was also made of all top-quality materials (steel, steel mesh, tough fabric indefinitely-reusable interior dust bags, phenolic, etc. They were made to last! Also, cats love it if you go "Boo!" into one end of the disconnected hose; they'll slap at the other free end with their paws (with the hose's metal end fittings, they can't damage it).
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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.
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  #107  
Old 05-03-2021, 01:58 PM
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Quote:
Originally Posted by ghrocketman
As long as the cans stay sealed, there should be no finite "shelf life" for R-12
I agree--as gas with such large molecules should leak very little, if at all, especially from cans whose plastic button-valves have never been pressed (the XR 100 motors used these). The other type of totally-sealed can, with a screwed-down metal valve that cuts into the top of the can while being screwed into place (I believe the Coldpower Convertible motors--and perhaps also the Valkyrie series motors--used/use [or can use] these), can never leak, unless the installed valve leaks or the can rusted through, but the latter would never happen with normal storage, and:

The only example of leakage from such cans that I know of involved/involves the Canadian-made LOGIX (and also made by the Tandy Corporation) Aeronautical Lab Kit. They came/come (some unused ones are still around) a small can of helium (the can looked/looks like one of those used for aerosol shaving cream), for the balloons used in the section on aerostatic flight. The lab's manual itself warns to not leave the can unused for long after its plastic button-valve is first pressed, because the helium will steadily leak out once that is done. (The very small size of the helium atom makes this possible, which is why hydrogen- and helium-filled weather balloons, pleasure Charliere balloons [gas balloons, as opposed to Montgolfiere balloons--hot-air balloons--hydrogen is often used in Charliere balloons in Europe because it's much cheaper than helium; all components are electrically connected to prevent static sparks], and airships take off soon after inflation is complete, and require extensive use of envelope and valve sealing compounds on the fabric ones.)
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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.
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