high altitude pumping a 1377
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high altitude pumping a 1377
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Topic: high altitude pumping a 1377 (Read 706 times))
zuma
Shooter
Posts: 12
yes
Real Name: marshall
high altitude pumping a 1377
«
on:
February 23, 2017, 03:21:59 PM »
I live at 7,500 ft. and am trying to figure out many
times i need to pump to equal the 10 pumps at sea level?
All the internals are factory on the 1377, thanks, zuma
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colorado palmer lake
CraigH
GTA Senior Contributor
Posts: 3540
Real Name: Craig
Re: high altitude pumping a 1377
«
Reply #1 on:
February 23, 2017, 03:59:11 PM »
I have been for a long time wanting to determine the actual value of this. I have seen various data. There are online experiments on different air guns and air gun types. By far the most affected are pumpers and springers; some data on the latter are huge limitations.
For MSP's like the Crosman 13XX, I have see loss values of 7% to 18% at my elevation of 6000 feet. Here is an engineering sheet that was posted to my 1322 topic yesterday by forum member WyoMan. From comments, experiment, and the link below, I would say for your altitude at least 4 pumps.
http://www.engineeringtoolbox.com/air-altitude-pressure-d_462.html
«
Last Edit: February 23, 2017, 04:51:10 PM by CraigH
»
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Lone Tree, Colorado
With freedom comes a terrible responsibility
zuma
Shooter
Posts: 12
yes
Real Name: marshall
Re: high altitude pumping a 1377
«
Reply #2 on:
February 23, 2017, 05:52:00 PM »
Thank you for the reply, i'll give 14 a try.
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colorado palmer lake
Techie
Expert
Posts: 1043
Real Name: Mike
Re: high altitude pumping a 1377
«
Reply #3 on:
February 23, 2017, 06:12:30 PM »
Based on the fact that the air is about 22.5 % less dense at 7500 feet than at sea level, I'd say 2 more pumps (20% more pumps) would do it.
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Rural Western Colorado
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high altitude pumping a 1377