Search found 747 matches

by jeepkahn
Thu Jan 07, 2010 3:32 pm
Forum: Pneumatic Cannons
Topic: Caveman simple HiPressure rifle...
Replies: 40
Views: 4609

I've never been a big fan of bends in barrels... I am going to modify slightly to reduce wasted pilot volume by switching to a male run tee off the qev, and a male fitted bv... will reduce the pilot volume about an inch^3
by jeepkahn
Thu Jan 07, 2010 12:47 pm
Forum: Pneumatic Cannons
Topic: Caveman simple HiPressure rifle...
Replies: 40
Views: 4609

nice but I think you could choose a more compact design (i.e. the main valve closer to your shoulder, thus allowing for barrel length for the same overall length) That one is in the works... It'll use copper construction and a cable actuated bv to pilot it... This was meant to be cheap, easy, and a...
by jeepkahn
Thu Jan 07, 2010 10:27 am
Forum: Pneumatic Cannons
Topic: Updated VIDEO 12/16/09 Jeepkahn's Collection...
Replies: 21
Views: 5121

by jeepkahn
Thu Jan 07, 2010 10:25 am
Forum: Pneumatic Cannons
Topic: Caveman simple HiPressure rifle...
Replies: 40
Views: 4609

Caveman simple HiPressure rifle...

to coin a phrase, "It's a High Pressure Rifle So simple a Caveman could build it"... I basicaslly wanted a shoulder fired version of the mini modgun that would enable heavier and larger bore projectiles to be launched using hipressure/lowvolume with performance exceeding hivvolume/low pressure pvc c...
by jeepkahn
Wed Jan 06, 2010 11:16 am
Forum: Pneumatic Cannons
Topic: qev question
Replies: 10
Views: 1914

jackssmirkingrevenge wrote:
POLAND_SPUD wrote:JSR's farting machine :wink:
You spend years of R&D perfecting the contant flow full auto valve, and all they remember is the farting machine *sigh* :D
And Fullstop or Not, A certain mod will ALWAYS be MCCrowley... :headbang:
by jeepkahn
Wed Jan 06, 2010 10:19 am
Forum: Pneumatic Cannons
Topic: qev question
Replies: 10
Views: 1914

Slightly off topic, but in a highpressure mini(JSR) you can put a plug in "sw" and the gev becomes a mini coax chamber...
by jeepkahn
Tue Jan 05, 2010 6:22 pm
Forum: Pneumatic Cannons
Topic: RX-396 Marble/Pellet Sniper Rifle NOT COMPLETE!!!!
Replies: 10
Views: 2447

I actually had planned on using a piston for it but i never really understood how it worked.
and i know about the pressure but im not a beginner
Looks workable, but for "not a beginner", you could do better...

[/quote]
by jeepkahn
Tue Jan 05, 2010 6:16 pm
Forum: Combustion Cannons
Topic: oversized chamber?
Replies: 14
Views: 1658

Also, Be aware that clear pvc has different(read lower) pressure ratings than standard pvc... But as long as your not going hybrid, it should be fine...
by jeepkahn
Tue Jan 05, 2010 1:49 pm
Forum: SpudFiles Discussion
Topic: pimpmann22 to CS metamorphosis
Replies: 21
Views: 1310

Brian the brain wrote:

Where can I find an emoticon that dies laughing...??
:withstupid:
by jeepkahn
Tue Jan 05, 2010 10:26 am
Forum: Ammo & Parts
Topic: New Nail Dart Design & Testing
Replies: 75
Views: 5855

One thing that gets overlooked in projectile design is overall length... Normally with most recreational spudguns you're dealing with sub-transonic flows, but for those of us who pllay with highpressures/high velocities, the airflow around the projectile will change, and when you are dealing with 90...
by jeepkahn
Tue Jan 05, 2010 10:01 am
Forum: General How-To & Discussion
Topic: Darts, aerodynamic jump, and freeflight....
Replies: 6
Views: 2140

My only concern with porting is that if you have a tight fitting projectile and the porting isn't perfectly calculated, then there will be a breaking effect on the round prior to exit. braking, not breaking. :D The braking will be minimal. Plus the lower velocity would be offset by less drag from l...
by jeepkahn
Sat Jan 02, 2010 4:17 pm
Forum: General How-To & Discussion
Topic: Darts, aerodynamic jump, and freeflight....
Replies: 6
Views: 2140

It doesn't say that you need barrell porting, but with what it does describe it makes it quite easy to deduce that if launch disturbances(aka high residual muzzle pressure) can be reduced before the projectile exits the muzzle(via muzzle porting) there will be significantly less yaw created by muzzl...
by jeepkahn
Sat Jan 02, 2010 3:40 pm
Forum: General How-To & Discussion
Topic: Darts, aerodynamic jump, and freeflight....
Replies: 6
Views: 2140

Darts, aerodynamic jump, and freeflight....

http://www.arl.army.mil/arlreports/1999/ARL-TR-1872.pdf Stumbled across this article for KE round flight characteristics, and thought it might come in handy for those of us that are into advanced projectile designing... The short of it is how it relates to drag/fin stabilized rounds in the transitio...
by jeepkahn
Wed Dec 30, 2009 5:22 pm
Forum: General How-To & Discussion
Topic: 7 x 12 Mini lathe bargain
Replies: 25
Views: 3180

You guys think parents can be stingy??? Wait 'til you get married..."No Honey, I didn't spend a dime for these fittings, the guy at the plumbing store needed some work done on his ATV and we worked it out in trade(wink wink)"... "No honey, The guy at fastenal needed some work done on his dirtbike so...
by jeepkahn
Tue Dec 29, 2009 4:58 pm
Forum: Ammo & Parts
Topic: 2" Compound Round Testing Video
Replies: 18
Views: 19309

When you find a combustion that can penetrate the quarter inch of steel using saboted darts my Christmas present can penetrate with a hollowpoint I will probably give up on magnum rifles and use that instead. What?!?!? Don't pneumatics get to play??? These shots are 1" ball bearings through 3/16" s...