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Carl Quick's LiteWieght 2240

So for about the last 24 months, I've had her on a serious diet. Now I am happy to report that she lost nearly 13 ounces and is feeling so much better. And let me say one thing, when I pick her up with one hand now she is light as a feather. Well, almost a feather.

Things I have done so far:

OEM main tube was lightened by me.
Barrel is OEM and trimmed down by me.
Main tube plug is made of Delrin by me.
Gas cap is aluminum, comes from HPA and bored out by me.
Hammer is made from Delrin by me with a modified 1701P striker.
Valve is an aluminum Disco rear end with a brass Pro-Top by Anthony.
Trigger grip frame is aluminum by Bluefork Design and then hogged out by Gregg.
Front barrel band is aluminum, made by Anthony, drilled by Rich and milled by me.

Quickster47



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My way may be too simple to be "right".

June 30 2012 at 8:32 AM
robert  (Login gubb33ps)
Crosman Forum Member
from IP address 68.105.50.68


Response to Gas velocity - port hogging relationship


Change the valve in some way, and the results will change, but if just looking at transfer port, can get an idea. Might be toosimplistic, but it seems to point in the right dirction for me.

So lets say you are playing ONLY with the transfer port.

Set your sweet spot velocity limit to whatever you choose, just keep the same strict limit for all transfer port sized tested. BEST would be a percentage limit...I tend to 3% of max.

Then it becomes the number of shots X the average energy.

Lets say we got the following 3% sweet spot with various sizes of transfer ports:

.07 = 35 shots @ 8 foot pounds = 280
.075= 30 shots @ 10 foot pounds = 300
.08= 25 shots at 13 foot pounds = 325
.085=20 shots at 16 foot pounds = 320
.09= 15 shots at 19 foot pounds = 285

That would lead me to believe the that at that pressure range, with that valve set up, a transfer port giving something in the 13-16 foot pound range is probably at its optimum. Change some other factor, like the operating pressure or the valve cycle, and would need to retest.

 
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