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Progcraft · Last edited by Progcraft on Thu Nov 11, 2004 4:49 pm; edited 1 time in total

I came across this over on the GWTW forums. It's a pretty nifty idea. I'll be making one of these soon.

http://img63.exs.cx/img63/9345/Bild849.jpg

http://www.int-veen.de/schablone.jpg

http://www.elliot.de/deutsch/bauplaene/cutout.pdf

If you want one like on the first picture it is a project fron the German drachenforum and it is available here:
http://www.drachenforum.net/forum/showthread.php?id=14090

P.
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Spence602 · Joined: 16 Sep 2003 Posts: 354 Location: USA TX Houston

Here's another style.

Make sure you get a metal one....
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KiteSquid · Posted: Thu Nov 11, 2004 8:19 am Post subject:

It looks like sombody with a CNC router should make some of these for us.

I have AutoCAD and can make the drawing if you have any special requests, but they would have to offer up time on their machine....

I would LOVE to see it cut from Stainless Steel but Aluminnum would probally do..... as it is easyer on mills.
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AKA Harold
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P.S. Yet another post by the Squid..... Shocked

Doesent he ever shut up???

P.P.S. The wind is like the air, only pushier.

Progcraft · Posted: Thu Nov 11, 2004 10:05 am Post subject:

marty · Joined: 22 Jan 2004 Posts: 128 Location: Arlington, MA USA

I think aluminum would be the better material. I believe that steel is a better conductor of heat than aluminum.
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KiteSquid · Posted: Thu Nov 11, 2004 3:10 pm Post subject:

dpb · Posted: Thu Nov 11, 2004 4:31 pm Post subject:

There is actually another issue besided heat conduction, and that is specific heat. Specific heat is the amount of energy needed to raise 1 gram of a substance 1 degree. It takes 1 calorie to raise 1 gram of water 1 degree, and so water has a specific heat of 1. Iron has a specific heat of .449 and so it only takes .449 calories to raise a gram of iron 1 degree.

This means that if you had equal masses of water and iron, and you put in enough energy to raise the water from freezing to spa temperature (about 120 deg fahrenheit), then you could bath in the water, while the same energy would cause the iron to raise a severe blister.

Now glass has a specific heat of .2 . So at that same mass and using the same energy as before, the glass would be hot enough to cause 3rd degee burns (heck, at 485 fahrenheit you could set paper on fire). Further, since glass doesn't propagate heat well, its possible that all the heat would be in one spot and the glass would be quite molten at that location (Btw, Aluminum has a specific heat of .215, so it heats up really easily, and then easily conducts the heat as well).

All in all, steel isn't bad at all. Water might be better, but its so difficult to have it hold a decent shape at room temperature (especially when applying a hot cutter).

Dave
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marty · Joined: 22 Jan 2004 Posts: 128 Location: Arlington, MA USA

Okay, make it from steel. I don't know why I thought aluminum would be better. Could be failing memory. Maybe it is because aluminum is easier to work with the tools that I have.
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Marty Sasaki
Arlington, MA USA

Progcraft · Posted: Thu Nov 11, 2004 5:03 pm Post subject:

wdrwilson · Posted: Thu Nov 11, 2004 5:25 pm Post subject:

Lindsey!!! Are you reading this!!

Ronda.. get Lindsey on the forum... I am sure he could make them.. Very Happy

--Bill