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No One Wins NASA Space Elevator Contest
volts writes "According to New Scientist no one was able to grab the two $50,000 top prizes in the recent NASA 'Beam Power Challenge'. The biggest limiting factor seemed to be that no team was able to meet the speed requirement, although a group from the University of Saskatchewan in Canada set the height record at 12 meters. Not quite geosynchronous..."
$50K for a design and prototype isn't a lot, but since student labor is basically free most of the money can go towards building the prototype. The biggest problem seems to be that the energy source available seems to be the light energy from a couple hundred watt lamp. Assuming that the bulb is 50% efficient that doesn't leave a lot of energy to move even the motors at the required speed, let alone the entire vehicle.
There are 4 boxes to use in the defense of liberty: soap, ballot, jury, ammo. Use in that order. Starting now.
Go back to steam engines, stirling engines? If your power source is light, why bother with electrical engines? Use some liquid gas as fuel in a tank, use the projected light as a heat source, let the gas heat up in a combustion chamber (a piston?) and drive the whole thing up as a locomotive :)
You can't handle the truth.
Actually what you "win" is licenseable technology that costs you $10 million less to develope and open the door to the posibility of getting the real "prize" which happens to be much larger (Also know as venture capital).
The minimum speed was 1 meter/s = 3.6km/h = 2.2369 miles/h. I can walk faster than that
Not straight up, you can't.
Geosynch is 35,786 km above sealeve according to wiki. At 3.6 km/h it would take over a year to get up to geosynch
True, but as gravity decreases, you accelerate faster per unit energy. I can't be arsed to actually do any math, but 1m/s at 1G is going to translate into significantly higher velocity the further out you go. Besides which, if you want to use the elevator primarily for moving materiel rather than personnel, a one-year turnaround might not be too bad; throughput is potentially more important than lag.
Even for personnel, that's on the order of time it took to sail from Europe to America via wind power, and people did that.
Reality has a conservative bias: it conserves mass, energy, momentum...
Totally unnecessary. If the capsule goes up at 1m/s, it will run 1km in 1000 seconds and 200km in 200,000 seconds, which is about 55.5 hours. At that distance the speed of the capsule can be raised by other means.
You can't handle the truth.
"$50K for a design and prototype isn't a lot, but since student labor is basically free most of the money can go towards building the prototype."
As a research professor with students who could have tried to build this thing, take my word for it that it's not enough money. I refuse to have my students doing someone else's research for free; I want to be able to pay them at least $10/hour + tuition remission. For an undergraduate at my fairly inexpensive institution, that's about $7K per quarter, and I'd need three of these. Add a $20K equipment budget and $5K for my time and we are at $46K.
So the budget is $50K. What's the problem? Just the obvious one that my chance of winning is quite difficult to estimate, but certainly way less than 100%. I'd put my expected return at around $5K. There may be institutions and individuals who can afford to expect to lose $41K for the prestige of doing good research and the prospect of future funding. I'm not one, so I'm out.
It doesn't appear that I am unique in these calculations.
By contrast, I just finished a NASA Phase I SBIR. $68,000 over 6 months, guaranteed. If I wanted to do space elevator research, I'd be way better off submitting an SBIR proposal than entering the contest: small up-front risk, higher expected return, better prospects of future funding.
Contests are run because there are often folks who overvalue them, so they are sometimes a cheap way to get things done at the expense of others.