Increasing Feet Per Second

 Concept 4 - Airgun Build  No Responses »
Jan 242013
 

Last year I completed the Buckley inspired rifle and I was hoping to get a chance to increase the feet per second (FPS) on the custom airgun. Earlier this week I set up my chrony and the resulting average was 716 fps with a .22, 14.3 Crosman Hollowpoint pellet.

Taking the gun apart I drilled all the 1/8″ air feed holes up to 3/16″. Resulting velocity increased to a three shot average of 749.

From there I removed the hammer spring and place a 1/4-20 hex nut behind it for a little more preload. Three shot averaged 796 FPS and highest was 805 FPS.

Energy produced prior was 16.4 fpe and 20.5 fpe with the changes. Hoping to increase the FPS to around 900 if feasible.

Calculating the changes with percentages it works out to 12.5 increase in velocity and a 25 percent increase in power!

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Given these results I worked out the power at 900 FPS would result in power of 25 fpe. So that will be the goal for spring.

Thanks for reading.

Concept 4 – Buckley Reservoir Design Build

 Concept 4 - Airgun Build  1 Response »
Oct 132010
 

I was able to do more work on the rifles I am building this past Monday. I hope to do more later this week and will post the pictures I have taken at that time. I have mounted the valve body on the action block and now need to start on the inner workings of the action. The hammer, trigger, sear, bolt and valve parts need to built. Barrel is ready to be mounted and waiting till all parts are completed for firing before this is done. The tight fit between the barrel and action will help ensure accuracy and do not want to take out the barrel to often and ruin the fit.

Mr. Schaefer’s Page Updates

 Updates  1 Response »
May 152010
 

I added two more pages for Mr. Schaefer. He has been busy creating a few more airguns and modifiying his bullpup to sport a multi shot clip.
http://airgundevelopment.com/custombuild/schaefer3.html

Along with the clip he has also created a side lever breech. Looks really great!

http://airgundevelopment.com/custombuild/schaefer4.html

Thanks for reading, more updates to come over the next week.