Canadian Airgun Forum

Mechanical assistance for HPA hand-pump
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Author:  joe hickey [ Thu Nov 07, 2013 5:01 pm ]
Post subject:  Re: Mechanical assistance for HPA hand-pump

rsterne wrote:
When you add air to the inlet side, the pressure in the first and possibly the second stages of the pump increases for the first part of the stroke, but in the third stage, which can never exceed gun pressure, all that happens is that the high pressure part of the stroke (while the check valve in the gun is open) gets LONGER because you are adding air to the gun for more of the stroke.... Basically, the resistance you feel at the bottom of the stroke is over a longer distance when you pressurize the inlet.... More heat is produced, of course, because you are compressing more air per stroke.... but the maximum FORCE doesn't increase, just the TIME you have to apply that force.... and hence you have to input more horespower (peoplepower) per stroke....


Quite right Bob.

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