SpudFiles

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?

This is gonna be good!!!!

I like this.

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.

My pump can't get to 100PSI (im not fat enough...)
The pump reads "high volume steel barrel"

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....

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

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)

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

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

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.

I gotta try that..

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.

I gotta try that..

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.


BoyntonStu

I suppose a 7.8x hybrid would be cheating...

I propose that instead of 20' range, it be modified to 150' range. Maybe at that point Boynton will grok stocks.

<maniacal> DD-1 at 100psi??? hhmmm... Do we have to use nails??? Or is this shooters choice of projectile???

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