Two types of propellant still considered for SpaceShip Two

Two types of propellant still considered for SpaceShip Two

WhileSpaceShip Two’s engine was originally using a rubber-based propellant, the company switched last year for a nylon-based solution. However, the vice-president of special projects for Virgin Galactic declared at the Space Access 2015 conference that the selection is not definite, stating that “The one we’ll fly is the one that’s best”.

Source: http://spacenews.com/virgin-galactic-considering-changing-spaceshiptwo-fuels-again/

Source: Virgin Galactic