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Author Topic: Amiga.Org users encouraged to help debate  (Read 10715 times)

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Offline JaXanim

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Re: Amiga.Org users encouraged to help debate
« on: March 12, 2006, 12:52:31 PM »
@Hyperspeed

If the driven wheels are on the conveyor, James Bond couldn't take off using wheel power alone (see my previous post).

Looping a helicopter depends on lots of things, including the design/stiffness of the rotor blades. Some 'copters can be looped, but others can't and would chop off the tail if it was tried.

Just Google for references on flying loops in helicopters.

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JaX
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Offline JaXanim

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Re: Amiga.Org users encouraged to help debate
« Reply #1 on: March 12, 2006, 02:52:22 PM »
@Hyperspace

Any object entering the Earth's atmosphere from orbit or from anywhere else in space experiences frictional heating. This depends largely on the approach speed and shape of the object. There are other factors, but these are the main ones. The thin outer atmosphere provides enough friction to evaporate a dust particle travelling at 50 Km/sec, hence we see shooting stars. Objects presenting a large face to the atmosphere will heat up quickly, but they will also be slowed down quickly (hence the shape and composition of re-entry heat sheilds). An aerodynamically efficient shape (like a bullet for example) would not heat so quickly (other factors apart). But it would certainly heat up (like Concorde's nose cone).

If the plunging object has enough substance/mass to not burn up completely, it will eventually be slowed down by the denser lower atmosphere and it might reach terminal velocity before landing on the Earth. Hence we get meteorites.

We don't experience hot parachutes because the velocity is too small to generate enough frictional heating, but it does happen. The surface of the chute will get warmer by maybe a few thousandths of a degree, as do the soles of man/woman's shoes, but not enough to notice. Anyone free-falling from say 250,000 feet will eventually reach terminal velocity but will also feel pretty warm (mainly from the adrenalin I suspect!)

JaX
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Offline JaXanim

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Re: Amiga.Org users encouraged to help debate
« Reply #2 on: March 12, 2006, 03:56:45 PM »
@odin

A couple of weeks ago, they released an old space suit from the International Space Station to see how long unheated batteries would work in orbit (I'd have thought NASA would know that already...?). The suit was supposed to stay in orbit while transmitting radio signals that anyone with a short wave radio could pick up. They published all the beep sequences so listeners could tell how it was getting along.

Anyway, the batteries packed up almost as soon as the 'SuitSat' was released. So, a bit of a damp squib all round. Anyway, the fully inflated suit is probably still out there, slowly losing altitude through weak atmospheric drag. It too will eventually fall with enough velocity to incinerate.

[EDIT] Here's NASA's  take on it. Russian idea apparently.

[EDIT] Apparently, the batteries did last an orbit or two. HERE'S someone's recordings! Well, whatever turns you on I suppose.

@Hyperspeed, is this what you're hearing...?

JaX
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