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100 psi idea/challenge

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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100 psi idea/challenge

Unread postAuthor: boyntonstu » Tue Nov 10, 2009 5:59 pm

Having shot a bunch of 3" 10d (10 penny nails ~88 grains) through 5/8" plywood at 20 feet, I am convinced that a 100 psi challenge is open to all PVC and metal gun builders.

100 psi is very easy to get.

Quick to get to 100 psi.

A bicycle pump, compressor, etc. almost any pump will do.



What damage can you do with 100 psi at 20 feet?
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Last edited by boyntonstu on Tue Nov 10, 2009 6:37 pm, edited 1 time in total.
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Unread postAuthor: jrrdw » Tue Nov 10, 2009 6:17 pm

This is gonna be good!!!! :twisted:
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Unread postAuthor: Technician1002 » Tue Nov 10, 2009 6:27 pm

I like this. :D

I have a few ideas. With a metal nail, I can magnetize them and use pickup coils to chronograph them. I can then directly compare sabot against small bore performance and use the best design to drive the nails.

I think the 2 inch cannon with a 2.5 inch barrel with a pop bottle sabot should do well.
:twisted:
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Unread postAuthor: rp181 » Tue Nov 10, 2009 6:27 pm

My pump can't get to 100PSI (im not fat enough...)
The pump reads "high volume steel barrel" :x
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Unread postAuthor: SEAKING9006 » Tue Nov 10, 2009 6:29 pm

Hmmm..... 100 psi..... Depending on the cannon/ammunition, you could do a very large amount of damage.... Depending on your definition of 'damage'.

Brings back memories of cast iron weights in the physics department. That one-kilo weight was calling to me, I swear....
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Unread postAuthor: c11man » Tue Nov 10, 2009 6:31 pm

well i know that my big pvc cannon (PLAUGE) at 100 psi will do some crazy damage. now i just have to attach some finns so my 18inch long 5/8 solid steel rod...

i guess i dont need to be in too much hurry seeing as i cant shoot it for at least 3 months due to tempature
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Unread postAuthor: jmadden91 » Tue Nov 10, 2009 6:33 pm

A 4 inch PVC Piston Valve can do a lot more than drive nails at 100psi :?

Edit: Beaten by like 4 people lol

(glass_05's piston cannon)
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Let's limit the challenge to 3" 10 penny nails ~88 grai

Unread postAuthor: boyntonstu » Tue Nov 10, 2009 7:41 pm

These common nails are $2.00 for a 1 pound box at WalMart. I counted 104 nails.

If the head diameter is a problem for small barrels, you can use a finishing nail.

100 psi and a 3" nail.

What damage can you do with it?

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Re: Let's limit the challenge to 3" 10 penny nails ~88

Unread postAuthor: spudtyrrant » Tue Nov 10, 2009 8:16 pm

boyntonstu wrote:These common nails are $2.00 for a 1 pound box at WalMart. I counted 104 nails.

If the head diameter is a problem for small barrels, you can use a finishing nail.

100 psi and a 3" nail.

What damage can you do with it?

BoyntonStu

see now that changes things lol
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Unread postAuthor: Technician1002 » Tue Nov 10, 2009 8:39 pm

100 PSI on a small diameter is very little accelerating force. A small long barrel limits flow.

May I recommend a large bore for the low 100 PSI for greater acceleration? I would be tempted to try to use a 10 foot 2 inch bore barrel on my 3 gallon do drive that nail to near sonic speed with a light sabot. :twisted:

I gotta try that.. :D
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Unread postAuthor: boyntonstu » Tue Nov 10, 2009 9:06 pm

Technician1002 wrote:100 PSI on a small diameter is very little accelerating force. A small long barrel limits flow.

May I recommend a large bore for the low 100 PSI for greater acceleration? I would be tempted to try to use a 10 foot 2 inch bore barrel on my 3 gallon do drive that nail to near sonic speed with a light sabot. :twisted:

I gotta try that.. :D


EXACTLY my point.

You read my mind.

A 10d nail can be sabot-ed to fit any barrel larger than its head.

I discovered that a double thick index card was required to prevent blow out of the tail.

It would be very interesting to see how much velocity/energy can be transferred to the nail with 'only' 100 psi and make it fly straight.

I had to go to 550 psi to finally push a 72 grain marble through 5/8" plywood.

Using 100 psi to drive a 90 grain nail cleanly through the same plywood is a real eye opener.

I may be reaching the conclusion that enough is enough (100 psi).

It sure makes life simpler on me and on the equipment.


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Unread postAuthor: ramses » Wed Nov 11, 2009 4:27 pm

I suppose a 7.8x hybrid would be cheating...
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Unread postAuthor: D_Hall » Wed Nov 11, 2009 6:07 pm

I propose that instead of 20' range, it be modified to 150' range. Maybe at that point Boynton will grok stocks. :lol:
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Unread postAuthor: jeepkahn » Wed Nov 11, 2009 6:18 pm

<maniacal> DD-1 at 100psi??? hhmmm... Do we have to use nails??? Or is this shooters choice of projectile??? :twisted:
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Unread postAuthor: Technician1002 » Wed Nov 11, 2009 7:04 pm

I live in town. Setting the target on my neighbor's porch cross the street won't make me very popular around here. :evil: If I could use my space by the RV parking with the log to catch strays, then things may go smoothly. :roll:
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