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Golf Ball What if Projectile?

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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Unread postAuthor: boyntonstu » Tue Oct 27, 2009 7:03 am

jor2daje wrote:it pretty easy to make golfballs fit normal sch40 1.5" pvc, here is an instructable on how, it works great, the crappier the ball the better because some of the nicer balls are rubber band balls on the inside.


Yes, that would give you a smooth 1.5" blue sphere.

It would not fly as well as a dimpled golf ball but it would fit the PVC pipe.

My thinking consists of several parts:

Cutting a golf ball to fit a copper or steel barrel for a 550 psi shot.

Imagine if you could stuff it into a barrel like a spud.

Would a slightly 'cylinderedized' dimpled gof ball fly straight and far?

As I recall there is a very expensive ($3,000) .50 smooth bore pneumatic hunying rifle out there that shoots heavy projectiles with amazing accuracy and power.

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Unread postAuthor: jor2daje » Tue Oct 27, 2009 7:22 am

But why botther with golf balls if your going to be doing so much modification? Golf balls are great ammo because they are very uniform, fairly dense, and have low air resistance.
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Unread postAuthor: boyntonstu » Tue Oct 27, 2009 7:48 am

jor2daje wrote:But why botther with golf balls if your going to be doing so much modification? Golf balls are great ammo because they are very uniform, fairly dense, and have low air resistance.


Yes, I agree, except for getting 550 psi behind them.

How would you do it with a safety margin?

If you could drop a ball into a hopper and out came a custom sized projectile, would that be nice?
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Unread postAuthor: psycix » Tue Oct 27, 2009 10:13 am

Cutting a projectile is easier then sleeving a barrel.
However, sleeving the barrel is easier then cutting hundreds of projectiles.

It depends on the amount of shots you expect to fire.
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Unread postAuthor: boyntonstu » Tue Oct 27, 2009 10:26 am

psycix wrote:Cutting a projectile is easier then sleeving a barrel.
However, sleeving the barrel is easier then cutting hundreds of projectiles.

It depends on the amount of shots you expect to fire.


Is a cylindicalized golf ball superior.

What barrel for 550psi?
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Unread postAuthor: psycix » Tue Oct 27, 2009 4:06 pm

I think a round ball goes further then a "cylindicalized" one, unless it is stabilized.

What barrel?
Something steel or aluminum probably.
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Unread postAuthor: spudtyrrant » Tue Oct 27, 2009 4:56 pm

psycix wrote:I think a round ball goes further then a "cylindicalized" one, unless it is stabilized.

What barrel?
Something steel or aluminum probably.
i think he's talking about using that copper piston gun he has, sdr 21 sleeved in 2" schedule 80 should work fine for the barrel, also i agree a round ball should travel farther than a "cylinderized" one
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Unread postAuthor: KAOS99 » Tue Oct 27, 2009 5:12 pm

Well, I'm new here, and I see that there are a lot of advanced gunners here. I don't know how close of a fit you want with the GB in the barrel, or what you are trying to hit, but I screwed around with my brother in Canada, and he found a piece of metal (I believe, steel) fence tube, thin-walled, that fit a GB nicely. I mean, it rolled down the barrel, but not sloppily. Seemed to work pretty well.
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Unread postAuthor: psycix » Wed Oct 28, 2009 6:10 am

sdr 21 sleeved in 2" schedule 80 should work fine for the barrel

Not with PVC and 550 psi...
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Unread postAuthor: Moonbogg » Wed Oct 28, 2009 9:51 am

1 1/2 SCH10 pipe works well for golf balls. Only a little honing and the balls fit snug, without rolling out. Aluminum is what I use. If you are trying to make golf balls work with a plastic cannon and 500psi I would forget it.
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Unread postAuthor: rp181 » Wed Oct 28, 2009 10:56 am

golf balls have very think shells, the inside is kind of like a rubber band ball, that was heated to stick to the shell. Unless your machining very little, you will find your self with a stretchy ball, with two hard shells at the end.
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Unread postAuthor: psycix » Wed Oct 28, 2009 1:44 pm

Some even have a liquid core.
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Unread postAuthor: Technician1002 » Mon Aug 02, 2010 10:49 am

A sabot could be used to increase the effective cross section for a powerful shot. I've shot golf balls this way with very good results. Use a low mass sabot.

Use a barrel diameter that matches the performance of your chamber and you can get some pretty good acceleration forces.

The combination below provides over twice the cross sectional area and adds less then 1/3 more mass.
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Another sabot that works well; This one is best for low pressure and egg toss distance competition.
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Unread postAuthor: Ragnarok » Mon Aug 02, 2010 11:50 am

MrCrowley wrote:It'd be interesting if GGDT had a tool for velocity drop of the projectile once it left the barrel, such as detailing the loss in velocity over a certain range.

I really should get back to work on the LRC... :(
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