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Alan Alford's build

2250b Tube for later move to bulk CO2.
12" .22 Caliber Barrel from Doomsday Backpacker
Brian & Assoc. Alluminum Breech with 2 barrel screws
Original site rear
Pin site on Custom Mt. Airguns Muzzle Break
2x1 Centerpoint Scope with UTG dovetail adapters
Mountain Airguns Custom Bolt and Handle
Mountain Airguns Custom Power Adapter and spring guide
B&A Boss Valve for extra Power

Built mainly for fun and to shoot at local Field Trial Pistol Match.

It currently it shoots a 14.3 Crosman Hunting Pellet at about 530 fps in a 72 degree room for 8.92 FPE.



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That was one of the arguments proposed....

June 14 2012 at 8:58 AM
rsterne  (Login rsterne)
from IP address 66.244.241.34


Response to I'm not convinced his air was room temperature

and compressing the small amount of air between the valve seat and the back of the pellet would indeed raise it's temperature.... However, the expansion of the MUCH larger volume of air in the tank which takes place to propel the pellet would surely LOWER the temperature of the total amount of air passing down the bore....

Since the velocity limit is based on the average speed of air molecules at a given temperature, I would think the "limit" would be lower than 1649 fps, not higher.... This experiment remains an anomaly, but one that seriously challenges the idea, IMO....

Perhaps the Siegel (IIRC ?) limit of 5 times the speed of sound is the one that really applies?....

Bob

 
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