One company respected most among all X-Prize contestants by many people is Scaled Composites. It's name is associated with vehicles such as the DC-X,B-2,Pegasus,Voyager and the Roton. It's CEO,Burt Rutan is well known among aviation circles.He has received numerous awards too.Scaled employes more than 100 people directly and has been extremely productive since it began it 1982.

Proteus is actually the name of the multi-purpose aircraft,which will carry the second stage. It has the cpability to carry a 100 kg load to the statosphere. In its space launch configuration it is designed to either carry an expendable second stage for satellite launches, or a three man space tourism vehicle. In this latter configuration Proteus is a contender for the X-Prize

Except for a cortoon-like graphic ,Scaled has released very little about the second stage through it's website.

Also See :

Spacecraft Tech	:	HTOL-TSTO
X-Prize	:	Eclipse Astroliner
X-Prize	:	Cosmopolis XXI

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