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Old Jan 10, 2003, 06:45 PM
Registered User
austin
Joined Jul 2001
80 Posts
vacuum pump from harbor freight

Any see these little red vacuum pumps for 15 bucks? Say they can pull somwhere around 25 or so inches. Says "venturi" style?
thanks
shane
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Old Jan 12, 2003, 01:54 AM
Registered User
Santa Paula, Ca
Joined Apr 2001
109 Posts
A venturi sytle of vacuum pump is not very usable for vacuum bagging. To get a Vacuum air from an air compresser is passed through a tube with a small hole in the side. The lower pressure in the tube caused by the fast moving air from the compresser will generate a vacuum, but not too much. The cost is the large volume of air required from the compresser. They are not very efficient. I'll look at the one you describe as soon as I can. Some time next week I can get by a Harbor Freight store. Happy flying!
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Old Jan 12, 2003, 05:37 AM
Life-abstract=conformity
S.F. Bay Area
Joined Aug 2002
1,872 Posts
"Venturi effect" for vacuum source...

Quote:
The lower pressure in the tube caused by the fast moving air from the compresser will generate a vacuum, but not too much.
It depends on the venturi design and the available cfm and psi available.
This technology is used to inflate the escape slides on passenger jets.
Even 2-3" Hg. is acceptable for 1#/sq.ft foam wing skinning.
A vacuum source without any mechanical positive displacement stuff has
got to some merit by virtue of it's longevity.
The way I would use this device would be to plumb the vacuum line to a
'tank' and run a line from the tank to your bag & wing setup with a valve.
Life sucks...make the best of it.
Jay.
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Old Jan 12, 2003, 09:24 AM
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austin
Joined Jul 2001
80 Posts
http://www.harborfreight.com/cpi/cta...temnumber=3952
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Old Jan 14, 2003, 06:42 AM
Registered User
austin
Joined Jul 2001
80 Posts
here is a guy using one for bagging

http://www.rocstock.org/wizards/fiber101.vac1.html
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Old Jan 17, 2003, 11:41 PM
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Santa Paula, Ca
Joined Apr 2001
109 Posts
Well there you go! everybody should have a 3hp compresser with a 40 gallon tank.. I used an old compresser from a refrigerator and hooked up to the intake side. Enough vacuum for me. OOps don't get caught letting all of that Freon out though while acquiring the compresser! I got mine about 20 years ago! Happy Flying!
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