comcn writes "The BBC have an article about an amateur "rocketeer" trying to send himself into space. After the £7m prize was announced for the first non-commercial person to get into space, it seems there are now several people aiming to win it. Cool."
Don't forget Brian Walker
by
ruszka
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· Score: 4, Informative
Brian Walker is an American who has had a lifelong dream of going into space. He's been working for a long time now to get there on his own. His website is here. His story is very interesting considering what all he's gone through to get this far. His launch date is set for May of 2002.
Re:In other news...
by
NeoTron
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· Score: 5, Informative
Yes, this group is called MARS - Middlesex Advanced Rocketry Society, of which I am one of the Flight Crew.
Bennet is basically a big joke in the UK, he has got all rocketry groups banned from using military bases to test rockets from, and one of his earlier rocket escapades burned a substantial part of moorland in Dartmoor.
Bennets rocket is nothing more than a scaled-up HPR (High Power Rocket) vehicle, and is nothing more exciting than is flown by many HPR enthusiasts here in the UK and the US.
Our most recent success flew last weekend - it's a true and proper amateur rocket utilising our new Hybrid rocket motor, quite possibly the most powerfull amateur hybrid motor flown anywhere in the world:)
It's one thing to launch an 11m rocket some 5000ft, it's quite another to build a functioning spacecraft!
At the very minimum it would have to carry a ton of payload; most probably quite a bit more. To get an idea of the kinds of equipment involved, this link [af.mil] on the Delta II provides a good overview of the kind of sheer power and equipment needed to put even a relatively small 5 ton payload into space.
It turns out that it's a lot easier than you think to build an X-Prize-winning rocket.
The Delta rockets and other commercial launch vehicles need to get an object into _orbit_. This takes about 30 MJ/kg (the binding energy for LEO), or about 8 km/sec delta-V.
Satisfying the X prize only requires sending a payload up to 100 km. It doesn't have to stay there. This only takes about 1 MJ/kg (1.0e5 metres times about 10 m/sec^2). This corresponds to a delta-V of about 1.4 km/sec. This is much, much easier to achieve.
The reason why this is *much* easier (or more accurately, why anything higher than 2-3 km/sec is *really* hard), is that when the delta-V of your rocket is larger than your exhaust velocity, the amount of fuel needed to give that delta-V to a fixed amount of payload starts growing exponentially (it's roughly linear below this threshold). Typical specific impulses for rocket fuels are in the 2000-3000 N*s/kg range, corresponding to exhaust velocities of 2-3 km/sec. So, anything below about 2 km/sec can be accomplished with relative ease, while anything above about 4 km/sec requires a rocket that's mostly fuel (and probably multi-stage, unless you have extremely strong and light materials).
In summary, building a rocket that can lift a payload into a sub-orbital trajectory that tops out at 100 km is certainly within reach of a small group's resources.
[The real problem will be finding someone willing to pay for it. You can't lift payloads into orbit with this rocket, and cost of developing the rocket will probably be more than you'd get from the X-Prize.]
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Brian Walker is an American who has had a lifelong dream of going into space. He's been working for a long time now to get there on his own. His website is here. His story is very interesting considering what all he's gone through to get this far. His launch date is set for May of 2002.
Yes, this group is called MARS - Middlesex Advanced Rocketry Society, of which I am one of the Flight Crew.
:)
Bennet is basically a big joke in the UK, he has got all rocketry groups banned from using military bases to test rockets from, and one of his earlier rocket escapades burned a substantial part of moorland in Dartmoor.
Bennets rocket is nothing more than a scaled-up HPR (High Power Rocket) vehicle, and is nothing more exciting than is flown by many HPR enthusiasts here in the UK and the US.
Our most recent success flew last weekend - it's a true and proper amateur rocket utilising our new Hybrid rocket motor, quite possibly the most powerfull amateur hybrid motor flown anywhere in the world
Go to http://www.mars.org.uk for more details.
Regards
Kevin Cave.
It's one thing to launch an 11m rocket some 5000ft, it's quite another to build a functioning spacecraft!
At the very minimum it would have to carry a ton of payload; most probably quite a bit more. To get an idea of the kinds of equipment involved, this link [af.mil] on the Delta II provides a good overview of the kind of sheer power and equipment needed to put even a relatively small 5 ton payload into space.
It turns out that it's a lot easier than you think to build an X-Prize-winning rocket.
The Delta rockets and other commercial launch vehicles need to get an object into _orbit_. This takes about 30 MJ/kg (the binding energy for LEO), or about 8 km/sec delta-V.
Satisfying the X prize only requires sending a payload up to 100 km. It doesn't have to stay there. This only takes about 1 MJ/kg (1.0e5 metres times about 10 m/sec^2). This corresponds to a delta-V of about 1.4 km/sec. This is much, much easier to achieve.
The reason why this is *much* easier (or more accurately, why anything higher than 2-3 km/sec is *really* hard), is that when the delta-V of your rocket is larger than your exhaust velocity, the amount of fuel needed to give that delta-V to a fixed amount of payload starts growing exponentially (it's roughly linear below this threshold). Typical specific impulses for rocket fuels are in the 2000-3000 N*s/kg range, corresponding to exhaust velocities of 2-3 km/sec. So, anything below about 2 km/sec can be accomplished with relative ease, while anything above about 4 km/sec requires a rocket that's mostly fuel (and probably multi-stage, unless you have extremely strong and light materials).
In summary, building a rocket that can lift a payload into a sub-orbital trajectory that tops out at 100 km is certainly within reach of a small group's resources.
[The real problem will be finding someone willing to pay for it. You can't lift payloads into orbit with this rocket, and cost of developing the rocket will probably be more than you'd get from the X-Prize.]