If the Enterprise was a giant inflatable, full of hydrogen or helium gas made of fine titanium mesh, ( and /or the inflatable concentric cone configuration heat shield technology currently being developed at NASA ? ) with internal bracing, , maybe it could be built on earth and could be floated up, or at least provide some buoyancy assistance , to a high altitude , where Alan Bonds Reaction Engines Limited Sabre air breathing rockets could propel it into orbit ?
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What if the Enterprise was built from an ultralight structure, and was at least partially buoyant by being filled with helium, to provide lift assist ? Could it be delivered from the shipyards into orbit, nearly empty, save for helium, and the aforementioned lifting engines, compressors and PV panels, and could be kitted out with deliveries made by Alan Bonds Skylon ?
The Sabre engines are fuelled by liquid Hydrogen, and liquid Helium. If the entire outside of the Enterprise were covered in the most lightweight available photo voltaic panels, would they be able to provide enough electricity to power compressors, to compress the lighter than air gases into the fuel required to fuel the Sabre engines and run the air pre-cooler refrigerant systems ? Also , could the PV panels power a bunch of ducted fans for extra lift ?