N-Prize Founder Paul Dear Talks Prizes For Nanosat Race 217
Rob Goldsmith writes to point out this interview with Dr. Paul Dear, founder of the N-Prize, and explains: "For those of you who haven yet heard of the N-Prize, the N-Prize is a £9,999.99 (sterling) cash prize which can be claimed by any individual, or group, who are able to prove that they have put into orbit a small satellite. The satellite must weigh between 9.99 and 19.99 grams, and must orbit the Earth at least 9 times. This project must be done within a budget of £999.99 (sterling)."
Get into orbit for a grand? (Score:4, Interesting)
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Re:Get into orbit for a grand? (Score:5, Informative)
15. Piggybacking and Shared Resources
Entrants may not 'piggyback' on other aerospace projects (for example, by launching a satellite as a passenger on a larger launch vehicle). If they do so, the entire cost of the launch will be considered part of the budget of their N-Prize entry. Similarly, no two entries (whether simultaneous or consecutive; whether by the same entrant or different entrants) are allowed to share the cost of common hardware (for example, if a single launch vehicle carries two satellites, then the total cost of the launch vehicle will be considered part of the budget for each of the two satellites).
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I remember seeing an analysis of this idea quite a few years back. In short, in order to add enough thrust using "D" engines to make it to orbit, you add so much extra weight that you'll never make it to orbit ... adding still more engines just compounds the problem.
Of course, this analysis was done assuming launch from ground, not launching from ... say ... a balloon launch platform at 20000m
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I can't find it now, but I remember stumbling across an amateur rocketry web site where the author (a licensed ham) had ground down a PIC chip (I think it was a 16C84 or 16F84) from 16 pins to the middle 8 pins, added a small clock crystal, watch battery, and a little antenna wire. The PIC repeatedly transmitted the author's
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What? (Score:4, Funny)
At least it's a new one, can't find a term for it anywhere.
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BURN THE SATANIST!
Re:What? (Score:5, Funny)
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English - English Translation... (Score:5, Informative)
Re:English - English Translation... (Score:4, Insightful)
However, a satellite weighing less than three quarters of an ounce yet able to be detected on the earth would most likely need an aluminum-foil dish or something, which would most likely take all the weight, and then you'd need some sort of support structure (Even if it's just wires or even tubes of air) and some sort of engine on it to make sure it made it around the earth a few times...I just think the weight requirements are the real killer here.
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A second and third stage might be one way to do it, though.
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Re:English - English Translation... (Score:5, Informative)
1. Space is an altitude. Orbit is a velocity. You can orbit 1 inch off the ground if you could some how sustain 8 km/s - for example, if you put a pipe filled with vacuum surrounding the Earth. So to get to orbit, you need a lot of speed, not a particular position.
2. GEO orbit (35786 km) is really hard to get to - and pretty pointless, really. Go above 400 km and you will hang around quite a while.
3. If you are in an orbit, you cannot possibly be a risk to airplanes. (Except on the way down, and even then the risk is way smaller than the risk caused by ducks, etc. - assuming you can even survive reentry)
Probably the easiest way to win this is with a mylar balloon as the "satellite". You could make a very large, highly reflective surface that would last a few orbits.
That said, this is unlikely to be won - $2K is just too low, it will cost more than that to get flight insurance / government permission.
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The mylar balloon solution is cute =) I wonder if they prohibit it, because it s
Re:English - English Translation... (Score:5, Funny)
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"For those of you who haven yet heard of the N-Prize, the N-Prize is a 12.67 (euro) cash prize (or half a liter of petrol) which can be claimed by any individual, or group, who are able to prove that they have put into orbit a small satellite. The satellite must weigh between 9.99 and 19.99 grams, and must orbit the Earth at least 9 times. This project must be done within a budget of 1.267 (euro) or 20 drops of petrol."
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Hell, I'd like to see the units translated to cubits and hogsheads.
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http://en.wikipedia.org/wiki/Rod_(length) [wikipedia.org]
http://en.wikipedia.org/wiki/Hogshead [wikipedia.org]
http://en.wikipedia.org/wiki/Abe_Simpson [wikipedia.org]
Re:English - English Translation... (Score:5, Funny)
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Mind you, people should stop drinking. That shit makes you paranoid. You're better off sticking with dope.
Re:English - English Translation... (Score:4, Informative)
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>Half litre is like way less than a pint, man.
Leaving out the obvious fact that English pubs still serve beer in pints, 0.50 liter = 1.06 pints. This should be blindingly obvious from the rather well-known fact that a liter is larger than a quart. But, given your rather beerish handle, I figure you already know all this. :-)
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0.50 liter = 1.06 US pints = 0.88 Imperial pints.
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>0.50 liter = 1.06 US pints = 0.88 Imperial pints.
[Smacks forehead] My bad. US pint, Imperial pint, Scottish pint, US dry pint, (argh) troy ounce, avoirdupois ounce, apothecaries ounce, Maria Theresa ounce. God, I used to know all this stuff. Thankfully beer helps one forget. :-)
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In pints, please.
Tight budget (Score:5, Funny)
Slingshot (Score:3, Funny)
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A rocket scientist asks... (Score:5, Interesting)
Is this some prototype for a global diamond delivery system? Serious, apprise me of the value of putting less than an ounce of something into orbit. And it's the "orbit" part that's tricky. A sufficiently large model rocket can do Alan Shepard-esque sub orbital flight. But to then pop it into orbit with a "circularizing burn" is tricky... on a budget.
I'm trying to not be a troll here, but this prize is designed to develop a $2K ICBM for very tiny payloads. If you put VX gas into something that might survive reentry, you'd have the plot for an Austin Powers movie. I'd call it "MoonShagger: It's a gas gas gas."
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And who is to say that this 20g can't be scaled up to haul 20KG or 200KG. Then, things get dicey.
I apologize for this paranoid mindset. I HATE to see rocket science subjugated to politics (as if it never happened before). I really do. But maybe 7.407284965 years under "the current administration" is long enough to get the feeling that if you TRY to do this, yo
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I apologize for this paranoid mindset. I HATE to see rocket science subjugated to politics (as if it never happened before). I really do. But maybe 7.407284965 years under "the current administration" is long enough to get the feeling that if you TRY to do this, you will raise ALL KINDS of attention from a lot of 3-letter organizations.
That may be just the point. If launching LEO objects become commonplace, then the launch of one particular LEO object might just go unnoticed. Maybe the N-Prize folks need to launch something unnoticed, and are trying to make sure that there is enough noise to go undetected.
Or, maybe it is a government-involved program to find all those who are capable of launching objects to LEO, to add them to a watch-list so that if the terictz come sweet-talking them, the government will have a one-up. Or, wait, maybe
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We need to get over this "rockets are scary" mentality - rockets are another way of moving from A to B, nothing more. Any method of moving can be abused, but the benefits outweigh the liabilities.
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Yes, like aircraft and other heavy equipment like cars, rockets need some regulation in order to keep the public safe. However, XCOR (as an example) has had thousands of engine firings and probably hundreds of manned flights without any explosions. Zero explosions. Zero
Re:A rocket scientist asks... (Score:4, Interesting)
delta-V = 9.8 * Isp * ln (Mass1 / Mass2)
Where delta-v is the change in velocity required (8-10 km/s for orbit), mass1 is the lift off mass, mass2 is the on orbit mass, and Isp is the specific impulse which is a parameter of engine design primarily effected by propellant choice. Isp varies between 100 and 450 seconds - the SSME is 450 seconds, an estes model rocket gets 100 or so seconds.
So the above example is a back of the envelope calculation for a conceptual rocket - mass1 is 10 kg, mass2 is 0.5 kg, Isp is 280 s. This gives you a delta v of 8.2 km/s, which is enough to reasonably be expected make orbit (assuming that orbit is possible at all, of course - I mean the basic engineering premise is a bit of a stretch, but the physics works).
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No, I did not neglect gravity, air resistance, etc. Orbital velocity is 7.7 km/s. I had a few hundred m/s extra for drag, and a few for gravity. I assumed a dense fuel (that's why the Isp sucks at 280), which minimizes air drag. I assume a rapid (as in high G) boost, because I don't see how you could possibly do this otherwise. I made lots of other assumptions, all vaguely reasonable, to make a back of the envelope calculation. The most unreasonable assumption
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I AM a degreed Aerospace Engineer who worked in El Segundo for a company that is now known as Boeing. Savvy? I worked with real rocket engines (Marquardt 5lbf and 100lbf [aiaa.org] I knew Gil and Phil...), loaded bi-propellant into very thin titanium tanks, and worked with those who worked with the solid motors, including the PAMs. (yeah, them). Now, I grant you i'm rusty, so that I had to look several times to make sure your Delta-V equation was
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OK, well getting into a credentials pissing contest with a pseudo-anonymous person is just silly - especially since, if what you say is true, our credentials are orthogonal. (My title has three letters in it, and my budget is much larger than yours I'd bet)
But, as I said, I'm pseudo-anonymous, your pseudo-anonymous - so let's let the math speak for us:
Wave drag + stagnation temperature - you seem to be assuming high velocities in the atmosphere which, as you point out, is probably a sub-op
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And no need to fit a guidance system. Were
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Re:A rocket scientist asks... (Score:4, Insightful)
But most things that involve BOTH propellant and the word "Cool" violate the National Association of Rocketry Safety Code. Let alone the Patriot Act!
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Re:A rocket scientist asks... (Score:4, Interesting)
You need to get an antenna and transmitter powerful enough to be trackedfrom earth an weighting 20 grams. Or put up some sort of light radar reflecting sail (only has to orbit 9 times on LEO and burn up, doesn't say it has to do anything useful).
I wonder if the tracking side is included in the budget or if you can borrow some really big antenna to try to detect the junk you put up.
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Brilliant meme! (Score:5, Interesting)
Great, more space junk. (Score:2)
With battery life being so short, it will revert to junk in no time. I doubt solar panels would survive a journey from the "delivery system" unless it put in space via traditional means costing way more than £9,999.99 (sterling).
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Those guys got it backwards (Score:5, Funny)
*Prizes* should look like 10,000.00 so they appear big.
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Enough with the nines already (Score:2)
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Sounds unfeasible (Score:3, Insightful)
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(Pretend that you had a magic SSTO gas and go rocket - all the $2K has to cover is the fuel, and $2K is almost a ton of fuel. The issue is the other costs - insurance and range rental.)
Even moreso if you count labor (Score:2)
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Even with all this, you need to get to better than 6 km/s to achieve orbital speed. That means you cannot use standard gun powder (the gas speed is too slow) but need to use high explosives. This means you need a
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The sabot is just used to get the bullet accelerated in the barrel. Light crossectional weight is good for acceleration, but for reduced drag you want the projectile to be as heavy per crossectional area as possible as soon as you leave the barrel. You might gain a little bit of additional acceleration out of the system by "firing" the bullet out of the sabot, but don't forget that means you have to accelerate the HE, and your trig
Request For Comets (Score:2, Interesting)
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Besides, it you wanted to deliver a rocket - based kinetic payload, it would have to survive reentry. Essentially, you are saying that this mystical bad guy is going to get some unobtainium, give it enough energy to make orbit, then remove most of that energy so that it comes back down, burn off most of the mass in t
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It is a cost issue. That is all.
Now this guy in New Zealand had a DIY cruise missile that he was making. http://www.interestingprojects.com/cruisemissile/diary.shtml [interestingprojects.com] Everything he posted appeared to be feasible. I have not kept
-- quizical look (Score:2)
So how do you buy enough explosives... (Score:2)
There are really several problems here.
First calculating how much gunpowder, TNT, ammonium nitrate , fertilizer/diesel, C4, etc. it would take to accelerate a small payload to orbital speed.
Second problem is to build a payload that can survive the acceleration.
Third is hitting it big on roulette to get enough money to pay for the explosives.
Fourth is how to get out of jail when you place the order for t
Why an upper weight limit? (Score:5, Insightful)
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Kind of the anvil from orbit idea I read about many many years ago. Launch a satellite that has a few hundred crowbars on board that are more aerodynamic with minimal guidance capability.
Licenses too. (Score:2)
Payload Limit (Score:2)
The whole satellite, including payload, has to weigh between 10 and 20 grams? Unless you have some mad desire to put a politician's brain in orbit, what the hell good is that?
Bush's brain (Score:2)
There's a reason the Saturn 5 was so big... (Score:2, Insightful)
Loophole? (Score:2)
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And everyone thought it was a hard problem to solve!
Is it that crazy? (Score:2)
As a previous poster said earlier proving it's up there is going to be the hard part.
19.99 grams < Disposable camcorder (Score:2)
Re:What is a sterling? Pound? (Score:4, Funny)
Re:What is a sterling? Pound? (Score:4, Informative)
The pound sign comes from "L". Where LSD - librae, solidi, denarii - was originally used in duodecimal from pounds, shillings and pence.
I never in my life thought that history lesson from high school would ever come in hand.
Re:What is a sterling? Pound? (Score:5, Informative)
Re:What is a sterling? Pound? (Score:4, Informative)
The original "Pound Sterling", way back when, was just that -- one pound of Sterling (92.5% pure) silver.
Re:What is a sterling? Pound? (Score:4, Informative)
The full, official name pound sterling (plural: pounds sterling) is used mainly in formal contexts and also when it is necessary to distinguish the currency used within the United Kingdom from others that have the same name. Otherwise the term pound is normally used. The currency name is sometimes abbreviated to just "sterling", particularly in the wholesale financial markets, but not in amounts; so "payment accepted in sterling" but never "that costs five sterling". The abbreviations "ster." or "stg." are sometimes used. The term British pound is commonly used in less formal contexts, although it is not an official name of the currency. A common slang term is quid (plural quid).
The term sterling is derived from the fact that, about the year of 775, silver coins known as "sterlings" were issued in the Saxon kingdoms,[6][dubious - discuss] 240 of them being minted from a pound of silver, the weight of which was probably about equal to the later troy pound. Because of this, large payments came to be reckoned in "pounds of sterlings", a phrase that was later shortened to "pounds sterling". After the Norman Conquest, the pound was divided for simplicity of accounting into 20 shillings and into 240 pennies, or pence. For a discussion of the etymology of "sterling" see Sterling silver.
The currency sign is the pound sign, originally with two cross-bars, then later more commonly £ with a single cross-bar. The pound sign derives from the blackletter "L", from the abbreviation[citation needed] LSD - librae, solidi, denarii - used for the pounds, shillings and pence of the original duodecimal currency system. Libra was the basic Roman unit of weight, derived from the Latin word for scales or balance. The ISO 4217 currency code is GBP (Great Britain pound). Occasionally, the abbreviation UKP is used but this is incorrect. The Crown dependencies use their own (non-ISO) codes: GGP (Guernsey pound), JEP (Jersey pound) and IMP (Isle of Man pound). Stocks are often traded in pence, so traders may refer to pence sterling, GBX (sometimes GBp), when listing stock prices.
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I wonder is some of Gerald Bull's plans are still around
http://en.wikipedia.org/wiki/Gerald_Bull [wikipedia.org]
You are designing a cannon to launch satellites (Score:5, Informative)
The simplest way to launch satellites is to design a great big gun. The U.S. did some experiments with this with Project HARP [wikipedia.org]. They were abandoned because manned flight required lower g-forces. However, if you just wanted to put a satellite into orbit, then guns can make sense.
Unfortunately, the last guy to try this (Gerald V. Bull), went on to attempt to build a super-gun [wikipedia.org] for Saddam Hussein, and then mysteriously got shot [wikipedia.org] (possibly by Israel's Mossad).
I'm not sure I want to win this contest. There have been quite a few projects in the area, and they all get canceled.
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In order to get a satellite into orbit with a gun on the ground, the sat has to carry a booster rocket. A gun on it's own can achieve a suborbital or an escape trajectory, but not an orbital one.
Getting the booster rocket to survive the g forces from the gun and still fire properly, at the right time, is very tricky. The gun itself tends to have to be really long, which introduces all sorts of other complications.
Cheap