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SFS news: N-Prize Rule Update

Posted by: Rob Goldsmith - Tue Jul 29, 2008 4:49 pm
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SFS news: N-Prize Rule Update 
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Post    Posted on: Fri Feb 06, 2009 9:33 pm
What if they build a launcher capable of putting 1kg into orbit? Does the N-prize satellite have to be less than 19.99g, but any other satellites placed in orbit don't count, only the N-prize sat?

Ah, I see. A launcher capable of putting a sat weighing between 9.99-19.99g into orbit. Is that like how Energia is capable of putting a 1 tonne payload into Orbit, despite the fact that 1 tonne is way way way below its max amount?

Or does that break the spirit of the competition?


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Post    Posted on: Fri Feb 06, 2009 10:13 pm
Sure have considered launching the N-Prize satellite from a larger satellite but.... This would overbudget the launch with fuel alone.

Monroe

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Post    Posted on: Fri Feb 06, 2009 10:44 pm
So launching a satellite perhaps weighing 1kg and launching the N-prize satellite out of it? Don't be so sure about the fuel costs. If we need 25kg of fuel/oxidiser mix for the rocket, then the cost would be most likely a max of £50. Cheap.


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Post    Posted on: Sat Feb 07, 2009 12:48 am
Terraformer
Would you care to extrapalate a little further? As I see it the fuel required to get into orbit is over budget as it is hence the gas gun in our attempt. I dont see where smaller (than we plan to use) solid fuel rockets can achieve obital velocity there is the square cube limit.

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Post    Posted on: Sat Feb 07, 2009 6:12 pm
Fuel is quite cheap (a liter of Petrol costs £0.89, and that's with all the tax), so unless you're using absurd mass ratios like 200 it wouldn't cost that much. If I do enter, I'll probably use a Hybrid rocket, with the Oxidiser being solid, and the fuel being Butane.

The Budget is a max of £999.99, so it should easily be within that. As it says, imaginative use of chewing gum is encouraged. While I wouldn't use chewing gum, cardboard poster tubes are quite solid, enough for a first stage. As long as the don't go Hypersonic through the lower atmosphere.


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