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  (Source: DARPA)
DARPA's goal is to cut costs and increase convenience

The Defense Advanced Research Projects Agency (DARPA) is looking to create an unmanned vehicle for satellite launches that is faster, cheaper and more convenient than existing systems.

To do this, DARPA has introduced the Experimental Spaceplane (XS-1) program, which encourages the development of a fully reusable unmanned vehicle that would launch satellites into space. It would look, act, and cost more like a traditional plane. 

Current satellite launch technologies can cost hundreds of millions of dollars per flight, and can only fly a few times per year. To top it off, they typically require years of advanced scheduling. 

“We want to build off of proven technologies to create a reliable, cost-effective space delivery system with one-day turnaround,” said Jess Sponable, DARPA program manager heading XS-1. “How it’s configured, how it gets up and how it gets back are pretty much all on the table—we’re looking for the most creative yet practical solutions possible.”

The idea behind XS-1 is to have a vehicle that can operate from a clean pad, use only a small ground crew, and eliminate the need for costly specialized infrastructure.

Also ideal for XS-1 is a reusable first stage that would achieve hypersonic speeds at a suborbital altitude, and at that point, one or more expendable upper stages would detach and deploy a satellite into Low Earth Orbit. The reusable hypersonic aircraft would then make its way back to earth and be prepared for the next flight. 

The rapid turnaround between flights could be done through modular components, durable thermal protection systems and automatic launch/flight/recovery systems.

DARPA's goal is to develop a vehicle capable of flying 10 times in 10 days; reaching speeds of Mach 10+ at least once; launching a representative payload to orbit, and reducing the costs for small payloads by at least a factor of 10 to less than $5 million per flight.

Think you have what it takes to create what DARPA is looking for? The agency is holding an XS-1 Proposers’ Day on Monday, October 7, 2013. You must register to enter, and registration closes October 1. 

Source: DARPA

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RE: In other words
By m51 on 9/19/2013 12:24:49 AM , Rating: 2
The cost of the fuel only accounts for a few tenths of 1% of the cost of the launch. Launch costs are dominated by the cost of the expendable launch vehicle. If you can develop a reusable vehicle you should be able to cut cost to orbit by something on the order of 100 times.

This is exactly the goal of Elon Musk's SpaceX. Their next generation engines will use Liquified Natural Gas as fuel, which is quite cheap, and Liquid Oxygen, which is practically free.

I would expect a reusable first stage design to be similar to Spacex's F9-R, the upper stage designs would be more open ended as it is a less well understood and more difficult problem to solve.

RE: In other words
By Reclaimer77 on 9/19/2013 1:46:38 AM , Rating: 2
I didn't say the cost of the fuel was what made it expensive. Engineering around having to carry X amount of fuel is. Also the weight of so much fuel means you have to have THAT much extra thrust to compensate for it to get into orbit.

RE: In other words
By troysavary on 9/19/2013 5:41:10 AM , Rating: 2
Physics fail. The only reason a rocket takes so much fuel is that they are using pure thrust to climb. A winged vehicle takes far less fuel to attain altitude. It takes a fighter jet enormous amounts of fuel to climb vertically, which is why that is not their preferred method of gaining altitude.

A space uses far less fuel than rocket booster. It doesn't need to be as large to accomplish the same job.

RE: In other words
By mjv.theory on 9/19/2013 7:07:32 AM , Rating: 2
Just about everything you've said is completely wrong, and the irony of starting by saying "physics fail" just beggars belief.

Of the energy/fuel required to reach orbit only about 7-9% is used to get to "space". That is, less than 10% overcoming gravity and atmospheric drag. Any addition of mass for aerodynamic lift (i.e. wings) completely cancels out any advantage gained from that lift.

The other 90+% of the energy/fuel required is to get the upper stage and payload mass to the required orbital velocity of 25,000kph (17,000mph). That is, 90+% of the energy/fuel is used for acceleration , and not for gaining altitude.

Air launch advocates should note that launching from 50,000ft at 600mph will get you less that an extra 5% payload to orbit . So if DARPA want to put a 2000kg payload (3000-5000lbs, not said above, but that is the DAPRA requirement) to LEO, then air launching the required 200 tonne cryogenically fuelled rocket will increase the payload to orbit by less than 100kg. The difficulties of air launch are so often underestimated, usually by the ignorant, who coincidentally also over-estimate the payload to orbit advantages.

RE: In other words
By M'n'M on 9/19/2013 3:13:22 PM , Rating: 2
QFT !!

The goal of this is to decrease the costs by reusing the expensive parts instead of throwing them away each launch. That was also the goal of the STS. The question then is ... have we learned enough to make a truly reusable re-entry vehicle ?

RE: In other words
By Reclaimer77 on 9/20/2013 10:52:01 AM , Rating: 2
Just about everything you've said is completely wrong, and the irony of starting by saying "physics fail" just beggars belief.

LOL his post was entertaining to read, I'll give him that..

RE: In other words
By JediJeb on 9/20/2013 5:21:01 PM , Rating: 2
But, if you are using a Ramjet engine to get to the launch altitude of 50,000ft you no longer need to carry as much oxidizer which will save some of the weight needed. Not that it will be a huge weight savings, but any reduction in needed weight is a plus.

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