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Dry

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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Unread postAuthor: dewey-1 » Thu Feb 07, 2008 3:37 pm

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Last edited by dewey-1 on Sun Apr 20, 2008 10:43 am, edited 1 time in total.
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Unread postAuthor: daberno123 » Thu Feb 07, 2008 3:51 pm

Is it just powdered teflon in an aersol can? Or does it come out as a liquid? Looks like it would work great
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Unread postAuthor: jackssmirkingrevenge » Thu Feb 07, 2008 10:35 pm

Nice, I've been getting by with automotive grease or KY so far but this looks like the proper stuff, cheers!
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Unread postAuthor: MrCrowley » Thu Feb 07, 2008 11:04 pm

Thanks, might look into that.
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Unread postAuthor: rna_duelers » Fri Feb 08, 2008 12:00 am

KY Jelly hahaha.We can always count on jack.

I might have to give this stuff a go when I mould some epoxy next time.I always have trouble with it sticking in some way.
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Unread postAuthor: jackssmirkingrevenge » Fri Feb 08, 2008 1:30 am

rna_duelers wrote:KY Jelly hahaha.We can always count on jack


At least I didn't suggest some reverse logic, like spraying teflon on yourself instead of KY :D
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Unread postAuthor: Novacastrian » Fri Feb 08, 2008 1:34 am

I have used this stuff before but it was under a different brandname (Can't remember what). Our business used to sell it.

One guy used to buy it to spray on his feet before he raced barefoot behind a speedboat :P

It is good stuff but tends to build up quickly when used for as a lubricating agent.
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Unread postAuthor: Solar » Fri Feb 08, 2008 4:58 am

Baby powder works wonders and doesn't contain ptfe's like Teflon.
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Unread postAuthor: BigGrib » Fri Feb 08, 2008 5:02 am

I would use spray on graphite. it comes out dry works great as a dry lube
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Yea, that's definitely going to get you at least a tazer.

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Unread postAuthor: jackssmirkingrevenge » Fri Feb 08, 2008 5:26 am

Novacastrian wrote:One guy used to buy it to spray on his feet before he raced barefoot behind a speedboat :P


I don't even have to ask what country you're from :D
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Unread postAuthor: Carlman » Fri Feb 08, 2008 5:32 am

jackssmirkingrevenge wrote:
Novacastrian wrote:One guy used to buy it to spray on his feet before he raced barefoot behind a speedboat :P


I don't even have to ask what country you're from :D


yea cauz only Aussies are so good that we don't need skis :D
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Unread postAuthor: MrCrowley » Fri Feb 08, 2008 5:36 am

Carlman wrote:
jackssmirkingrevenge wrote:
Novacastrian wrote:One guy used to buy it to spray on his feet before he raced barefoot behind a speedboat :P


I don't even have to ask what country you're from :D


yea cauz only Aussies are so good that we don't need skis :D


I would've said because only an Aussie would coat their feet in teflon to go 'barefooting'. That and <A HREF="http://en.wikipedia.org/wiki/Barefoot_skiing">it</a> was invented in Florida :roll:
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Unread postAuthor: Ragnarok » Fri Feb 08, 2008 7:57 am

I've been considering getting some Teflon spray to lube up the inside of my barrels to reduce friction. That said, the current friction hardly competes against 650 newtons of pneumatic force.

However, having been extensively trained by the Army Cadets in rifle maintenance, I do have the habit of doing a lot of cleaning of my launchers. The barrels get a good scrub out of any muck every now and again, then have their interiors polished to a nearly mirror shine (an advantage of copper) and lubed - currently just silicon spray, but I'm considering going up to PTFE.

I don't think it affects velocity much, maybe only a few feet per second, but I feel (probably unjustifiably) it helps accuracy a bit - and it's actually quite relaxing to do.
Maybe some day if I ever get a really good chrono, rather than my "ballpark" homemade one, I'll compare a cleaned and lubed barrel to one that hasn't received the attention.

jackssmirkingrevenge wrote:I don't even have to ask what country you're from

What is it that makes Australians so nuts?

They're only defeated in the madness by the Icelandics - because even the Australians have never tried driving a thousand horsepower N<sub>2</sub>O injected 4x4 jeep across the surface of a lake - have they?
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Does that thing kinda look like a big cat to you?
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Unread postAuthor: jackssmirkingrevenge » Fri Feb 08, 2008 8:11 am

Ragnarok wrote:What is it that makes Australians so nuts?


The fact that they're descended from convicts? :D

Teflon coated bullets gain several hundred feet per second over uncoated bullets, thanks to the reduced friction.
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Unread postAuthor: Ragnarok » Fri Feb 08, 2008 9:03 am

You have to bear in mind that firearms and spudguns have very different friction.

Firearms deliberately use projectiles that are too big, then just use brute force to get them down the barrel while they're pushing out very firmly sideways on the wall. You'll use a lot of pressure just to do that - a few thousand psi probably.

In most cases, spudgun projectiles barely touch the walls at all, and when they do, it's not normally a high friction situation -a light poke will easily move them. Here, if we lose more than a few psi in friction, we have a problem - especially as so many people have so little pressure to spare. :D

In a high pressure cannon, the loss of a couple of psi to friction isn't too large a concern - I'd reckon I lose less than 1% of HEAL's pressure to friction. So, the barrel lubrication is a little moot, but it hardly hurts performance, and it's not a bad idea to perform regular maintenance on a launcher to make sure it's all working properly.

The fact that they're descended from convicts?

I've got a more clichéd ancestry than that. On one side of the family, I'm descended from Smiths (Including one called Will - but not the famous one of course), and on the other, I'm descended from Joneses. So on one side, I've got the most common surname in the UK, and on the other, the most common in Wales (also the 2nd most common in the whole of Great Britain).

And in the end, I end up with a surname so rare it doesn't even appear on a list of the most common names in Great Britain or on lists of etymology - but as I've said before, still reasonably well known, because it also belongs to a film director (which means that I can never find myself on a search engine) - it's a little more common in the US, but there are probably under 20,000 people with the name worldwide.

However, I do know that the name is mostly found in very specific locations in the UK. Mainly North West of London and near Birmingham.
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