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Old 2021-11-11, 15:17   #4390
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Quote:
Originally Posted by firejuggler View Post
Instead of using fuel to launch satellite in space, this company propose to use a slingshot for the first part (aka exit athmosphere)


https://newatlas.com/space/spinlaunc...-first-flight/ is a short news article about it


https://www.spinlaunch.com/ is the website


I 'm split between and
The description "slightly taller than the Statue of Liberty" is ambiguous. It doesn't specify whether it includes the height of the pedestal, which is about as tall as the statue itself.

So as an exercise, I plugged v = 5000 mph and a = 10000 g's into the formula

a\;=\;\frac{v^{2}}{r}\text{ or }r\;=\;\frac{v^{2}}{a}

to work out the radius of the sling. It came out to around 51 m. This is close to the height of the statue itself, from the feet to the top of the torch. The height of the "sling chamber" is a bit more than twice the radius, hence a bit more than the height of the statue, including the pedestal, measured from the ground.
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Old 2021-11-11, 16:47   #4391
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What about the Slingatron? They have not made much progress either.
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Old 2021-11-11, 17:04   #4392
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Quote:
Originally Posted by Dr Sardonicus View Post
The description "slightly taller than the Statue of Liberty" is ambiguous. It doesn't specify whether it includes the height of the pedestal, which is about as tall as the statue itself.
Check out the video. It has a visual comparison.
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Old 2021-11-11, 17:29   #4393
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Quote:
Originally Posted by firejuggler View Post
Instead of using fuel to launch satellite in space, this company propose to use a slingshot for the first part (aka exit athmosphere)


https://newatlas.com/space/spinlaunc...-first-flight/ is a short news article about it


https://www.spinlaunch.com/ is the website


I 'm split between and
Would work very nicely on the moon where orbital velocity is very much lower than here and where there isn't an atmosphere in the way.

No need to produce chemical fuels from local water either as it could be powered from photovoltaics or a fission reactor flown in from the Earth.
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Old 2021-11-11, 18:28   #4394
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When I saw the radius of the sling was about as long as the Statue of Liberty is tall, I thought of the statue placed along a radius, and tried to visualize what would happen to it as the machine revved up. I fear Lady Liberty would not fare too well.

But - onward and upward! The trusty formula I used before tells us something about the more ambitious goal of slinging something into orbit.

Getting to LEO would require about 3.5 times the 5000 mph the Suborbital Accelerator is said to be capable of. Assuming the L100 Orbital Mass Accelerator keeps the acceleration at "only" 10000 g's, the radius of the sling would have to increase by a factor of 3.52 or 12.25 to get to 17500 mph.

OK, so much for getting something up to speed inside the launch chamber. But then what?

I had been sort of wondering about what would happen to something exiting a vacuum chamber and hitting the lower atmosphere at 5000 mph. If nothing else, it will probably slow down fairly rapidly.

For something exiting a vacuum chamber and hitting the lower atmosphere at 17500 mph, I'm wondering if overheating might be a problem.
Quote:
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Would work very nicely on the moon where orbital velocity is very much lower than here and where there isn't an atmosphere in the way.
<snip>
Indeed...
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Old 2021-11-19, 17:18   #4395
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https://www.quantamagazine.org/the-s...buns-20211118/
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Old 2021-11-20, 12:21   #4396
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Quote:
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10 vs 8? Because sometimes a dog goes without a bun. A niece refused to eat anything else for months when young. (Now a vegetarian, go figure.)
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Old 2021-11-20, 14:16   #4397
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Besides simply being eaten without buns, or with alternative wraps, "orphan" hot dogs can be sliced and added to other things - baked beans, macaroni and cheese, etc.

I note that in some cases, "shrinkflation" has reduced hot dog buns to the point of inadequacy. Assume the buns are the usual white air bread. A one pound 8-pack would have two ounces of bread per bun. But a 12-ounce 8-pack only has 1.5 ounces of bread per bun. (There are even 11-ounce 8-packs.) Put a dog with fixings in one of those skimpy things, and it will likely disintegrate in your hand. Such buns are not worth buying at all, definitively solving the matchup problem.
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Old 2021-11-20, 14:31   #4398
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Quote:
Originally Posted by Dr Sardonicus View Post
Such buns are not worth buying at all, definitively solving the matchup problem.
A slice of multigrain bread works for me. More digestible than the gummy pasty-white buns, too. Less frequent structural failure at the hinge is a bonus. Plus better cost.

Last fiddled with by kriesel on 2021-11-20 at 14:32
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Old 2021-11-20, 14:41   #4399
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Better question, is a hot dog in a bun considered a sandwich?
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Old 2021-11-20, 15:09   #4400
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Quote:
Originally Posted by rogue View Post
Better question, is a hot dog in a bun considered a sandwich?
As soon as the hinge breaks, Yes.

As for health, I have moved to bun-less, although the healthfulness of the "dog" itself is still a question.
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