It seems very exotic compared to something like RP1 or Methane, especially for a vehicle which should be flying a lot and around civilians. Why was this choice made?
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The Virgin Galactic design was originally based on Burt Rutan's SpaceShipOne design. Scaled Composites chose ("after a lengthy study") a N2O/HTPB hybrid motor for that vehicle because they felt it combined the handling simplicity of solid motors with the ability to terminate the thrust at will.
answered Apr 6, 2018 at 0:34
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1$\begingroup$ I've just asked Why did Virgin Galactic switch back to HTPB after one launch using thermoplastic polyamide (i.e. nylon)? $\endgroup$– uhohCommented Apr 6, 2018 at 5:12