cpd wrote:What size of rocket are you proposing? Wouldn't most be too large to be powered by jet engines (how many would be needed), and how should they get off the ground?
boacvc10 wrote:But for the lift phase: Someone correct me: Pratt and Whitney F119 (F-22 Raptor engine) 1800 kg dry mass (91 kN thrust). So approximate vertical lifting ability in sustained flight: 91000/9.81 kg -1800 kg - 1800 kg (upper stage structure) - 2000 kg (fuel?) - 5000 kg (lower stage fins, structure, controls) = ~3,100 Kg payload. Anything less than ~3,100 the payload will be accelerated upwards.
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