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Spud Showdown

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Unread postAuthor: Jared Haehnel » Tue Mar 25, 2008 10:43 am

Right thats what I meant.. sorry. :oops:
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Unread postAuthor: LikimysCrotchus5 » Tue Mar 25, 2008 11:00 am

Its ok, thats what we do here (as you know) look out for each other :wink:
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Unread postAuthor: rcman50166 » Tue Mar 25, 2008 11:40 am

Well what kind of densities are we talking about. I'm aware the material exists, but have never found a use for it. If I were to make it, what mixtures should I use. Also how much stronger than galvanized steel is it, if any. Honestly, I don't think I'll even attempt to make one unless some impressive stats are mentioned.
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Unread postAuthor: judgment_arms » Tue Mar 25, 2008 11:48 am

If you’re talking about Pykrete, during WWII the Allies were experimenting with an aircraft carrier made from the stuff.
In a demonstration a block of Pykrete was shot, the bullet just ricocheted off.
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Unread postAuthor: Jared Haehnel » Tue Mar 25, 2008 11:50 am

I've never made but what from what I've read (mostly on this site) is that it is pretty strong stuff. It would be easier to make then concrete. I don't know about stronger then concrete but it would be at least close to it. but It would be very strong. As for density it is less then that of galvanized steel. But so is concrete for that matter...
The advantage is that you can make it to best fit your barrel and since its frozen water you wait a minute or to before you launch and it will have low friction as it slides down the barrel.

Edit: Look here http://en.wikipedia.org/wiki/Pykrete
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Last edited by Jared Haehnel on Tue Mar 25, 2008 12:10 pm, edited 1 time in total.
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Unread postAuthor: judgment_arms » Tue Mar 25, 2008 11:56 am

Jared, the stuff is like reinforced concrete.

I’d wager that a large enough bullet of Pykrete could punch though ¼ inch steel plate, at the very lest make a nice, BIG, dent.
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Unread postAuthor: LikimysCrotchus5 » Tue Mar 25, 2008 12:01 pm

rcman50166 wrote:If I were to make it, what mixtures should I use?


From my information, that i previously studied from a different topic, the best mixture is 14% sawdust, and 86% water. So in a 100ci container, you would put 14ci of sawdust and 86ci of water.

judgment_arms wrote:during WWII the Allies were experimenting with an aircraft carrier made from the stuff.
In a demonstration a block of Pykrete was shot, the bullet just ricocheted off.


Indeed, i saw a video on this topic on metacafe, it was in a topic on spudfiles, but i dont want to find it. This stuff was strong and definately wouldnt be considered if it couldnt handle machine gun fire or types of explosions. IIRC, this project wasnt put into action because the war had already ended.

Jared Haehnel wrote:wait a minute or to


Surely you would wait longer than a minute :wink:

But also i think it takes longer to freeze because of the sawdust.
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Unread postAuthor: Jared Haehnel » Tue Mar 25, 2008 12:13 pm

Look here it is very fascinating and I'm glad it was brought up...

http://en.wikipedia.org/wiki/Pykrete
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Unread postAuthor: judgment_arms » Tue Mar 25, 2008 12:20 pm

LikimysCrotchus5, I don’t know about how long it takes to freeze, but I now it’ll stay frozen for a significantly longer time than regular ice.
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Unread postAuthor: LikimysCrotchus5 » Tue Mar 25, 2008 1:17 pm

Well i checked the wikipedia article and it doesnt mention anything about how long it takes to freeze.

But you are definitely right in that it takes alot longer time to melt. According to the article, a 1 inch piece of pykrete can support the weight of a car, which is amazing considering its only sawdust and ice. It also can handle more "crush resistance" than 21 megapascals, (3,000 psi). It is also more stable at higher temperatures because of the wood pulp.

So theres some food for thought :)
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Unread postAuthor: sniper hero » Tue Mar 25, 2008 2:17 pm

that pykrete is so cool!
can anyone make pics if he made it?
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Unread postAuthor: DYI » Tue Mar 25, 2008 6:20 pm

3" Pykrete slug on the far right:

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It went through a microwave at 400 fps and kept going, and suffered very little damage, although it chipped quite a bit at the front.

And the ratio for mixing is by mass, not by volume. Makes quite a bit of difference :wink:
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Unread postAuthor: SpudFarm » Tue Mar 25, 2008 6:36 pm

i can't stop watch the propane tank thing stuff :S
do more shots with it :)
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Unread postAuthor: pizlo » Tue Mar 25, 2008 7:02 pm

yeah, the five spiked one is just... well its Uber.
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Unread postAuthor: SpudBlaster15 » Tue Mar 25, 2008 7:04 pm

LikimysCrotchus5 wrote:From my information, that i previously studied from a different topic, the best mixture is 14% sawdust, and 86% water. So in a 100ci container, you would put 14ci of sawdust and 86ci of water.


Those proportions would be by mass, not by volume, as water is much denser than sawdust, and different sawdust samples will have differing particle sizes and shapes, and thus differing density. Measuring by volume instead of mass is a common mistake among dumbasses (Not saying you are a dumbass) who are trying to create pyrotechnic compositions.
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