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Bæði dúkur og filma eru þannig að þegar maður hitar þau, þá skreppa þau saman. Ef maður togar í þau í stað þess að leyfa þeim að dragast saman, þá getur maður teygt á þeim -- ekki mikið, en nóg til að klæða flestar kúpur.

Hérna er mjög góð grein: http://www.rc-airplane-advisor.com/heat ... ering.html

Þetta er flott síða-
Ég hef átt í fjölbreyttum vanda með vængenda svipuðum þessum:
http://www.rc-airplane-advisor.com/imag ... d-tip1.jpg

Hérna er vídeóbloggur númer 2:

Saga um Bubbba:

Two Tennessee Rednecks, Bubba and Jim Bob, are sitting at their favorite bar, drinking beer.
Bubba turns to Jim Bob and says, "You know, I'm tired of going through life without an education. Tomorrow I think I'll go to the Community College, and sign up for some classes."
Jim Bob thinks it's a good idea, and the two leave.
The next day, Bubba goes down to the college and meets the Dean of Admissions, who signs him up for the four basic classes: Maths, English, History, and Logic. "Logic?" Bubba says. "What's that?" The dean says, "I'll show you. Do you own a weed-eater?" "Yeah." "Then logically speaking, because you own a weed-eater, I think that you would have a yard." "That's true, I do have a yard." "I'm not done, the dean says. "Because you have a yard, I think logically that you would have a house." "Yes, I do have a house." "And because you have a house, I think that you might logically have a family." "I have a family." "I'm not done yet. Because you have a family, then logically you must have a wife." "Yes, I do have a wife." "And because you have a wife, then logic tells me you must be a heterosexual." "I am a heterosexual. That's amazing, you were able to find out all of that because I have a weed-eater." Excited to take the class now, Bubba shakes the Dean's hand and leaves to go meet Jim Bob at the bar.
He tells Jim Bob about his classes, how he is signed up for Math, English, History, and Logic. "Logic?" Jim Bob says, "What's that?" Bubba says, "I'll show you.
Do you have a weed-eater?"
"No."
"Then you're a homo."

HA. ha, ha, ha!

Bubba then went to his first logic class. "I now know that according to logic, homos don't own weed-eaters. But I'm still a bit confused", he said to his logic professor. "Well yes", the professor said, "I can give you another example of a logic puzzle. If my parents have a kid, and it's not my brother or my sister, who is it? Think about it a while."

Bubba goes home and thinks about it really hard but to no avail. Defeated, he asks his mother. "Well Bubba dear, if my parents have a kid that's not my brother or my sister, that would be me!"

A few days later, Jim Bob and Bubba meet at the bar, and Bubba tells Jim Bob that he's learned more about this "logic" thing. "How so?" asks Jim Bob, still a bit sore that logic could tell he was a homo. "Well, if my parents have a kid, and it's not my brother or my sister, who is it?" Jim Bob tries to think about it for a while and then gives up. "Well, it's my ma of course!"

Jim Bob?:

[quote=Björn G Leifsson]Jim Bob?[/quote]
Nei, Bubba !

Já auðvitað hann er jú frekar gáfulegur á svipinn.