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I too have wondered about the engines. As alan said, essentially skylon is hotol but with the fuel tank distributed either side of the wings and c of g. I guess the engines were moved to wingtips because otherwise they would be heating the rear of the fuselage, but on re-entry its surely got to get pretty hot anyway. My worry is that there is going to be an occasion when one of the engines malfunctions at some stage. I dont know how much power those engines can kick out but an asymmetry of thrust has got to be bad.