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Doug LaRock
Master Kite Builder
Joined: 11 Jan 2004
Posts: 179
Location: Yakima, Washington
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 Posted: Tue Dec 07, 2004 11:05 pm Post subject: |
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I didn't look up the CTE for uhmw which is used for alot of kite fittings, but it is a big number compared to alum. Which means a 20 deg. temp change make a big change in the size of a hole in a fitting. Not that uhmw isn't a great material you just have to plan ahead.
Doug |
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dpb
Master Kite Builder
Joined: 17 Dec 2003
Posts: 456
Location: Portland, OR
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| Posted: Wed Dec 08, 2004 6:42 pm Post subject: |
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| knotronda wrote: | In other words, it doesn't expand like the little capsule Sea Monkeys when tossed in water, or grow with heat like bread does in an oven??  
How technical do we have to be when making parts? You build them, we use them. We break them, you sell us more. A system that works doesn't need fixing.
KR |
I mostly agree with you Ronda, but there are cases.... For instance, I am told that most of the "Hagaman" parafoils being produced are going down to Antarctica to hoist weather equipment (powered equipment uses precious gas, and balloons get brittle at those temps). Down there, you would want to know thermal expansion (or contraction) of your equipment, especially as you are not going to be able to replace it for several months (no reordering to Steve for spare parts there).
Dave
_________________
Cherry Blossoms fall like rain,
A lively kite steals the sky,
Paradise in a moment. |
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