Can’t remember exactly, it’s been awhile. I think it may have been around 4 to
5 thousand ft. I was using it only for functionality checks on an altimeter. I
remember not being able to completely seal the bell jar connections.
Sent from my iPad
On Apr 24, 2020, at 12:40 PM, Cris Erving <cris.erving@xxxxxxxxxxx> wrote:
How much "altitude" can you get with it? I got one of those two during the
25% BF sale... I haven't had the time to rig up a test jar yet.
Eggtimer Cris
From: roc-chat-bounce@xxxxxxxxxxxxx <roc-chat-bounce@xxxxxxxxxxxxx> on behalf
of dmarc-noreply@xxxxxxxxxxxxx <dmarc-noreply@xxxxxxxxxxxxx>
Sent: Friday, April 24, 2020 12:28 PM
To: roc-chat@xxxxxxxxxxxxx <roc-chat@xxxxxxxxxxxxx>
Subject: [roc-chat] Re: Vacuum Pump
I found a cheap pump at Harbor Freight. They have two grades, the cheap one
was about $100 when I bought it about 4 years ago. Used it for checking
altimeter along with a bell jar I got from Amazon.
Sent from my iPhone
On Apr 23, 2020, at 9:51 AM, John Coker <john@xxxxxxxx> wrote:
I have used a venturi as well for vacuum bagging. (I use a system meant for
laminating: https://www.qualityvak.com/air.html.)
I'm sure a true vacuum pump would get a harder vacuum, but for most purposes
a venturi works well enough.
Now, if you don't have a good air compressor, then a venturi is less
appealing.
John
On Thu, Apr 23, 2020 at 9:14 AM James Dougherty <jafrado@xxxxxxxxx> wrote:
Lee
https://youtu.be/cDIooANLU3Q
that Nike Nike I flew off your tower had the sustainer bagged with this pump:
https://www.fibreglast.com/product/1148_Vacuum_Generator/Vacuum_Bagging_Pumps
fins bagged with food-saver
https://www.amazon.com/dp/B07VPRW77Z/ref=cm_sw_r_cp_api_i_C6BOEb8Q8FW1V
best bang for the buck...
thanks Dierking for your remora cam
On Apr 23, 2020, at 8:27 AM, Lee Scott (Redacted sender "leescott91006" for
DMARC) <dmarc-noreply@xxxxxxxxxxxxx> wrote:
Guys in the know
I am going to be purchasing a vacuum pump in the near future and there
seems to be quite a few options.
I plan to use it for the following:
- degassing propellant for research motors
- vacuum bagging of composite laminates for fins and tubes
- testing of electronics in a chamber.
I am not necessarily looking for the best price. I am looking for a pump
that will meet my needs and not be something I need to worry about not
performing as expected.
Does anyone have any recommendations?
Thanks
Lee
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