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.
Nomadd wrote:Nomadd wrote:tu204 wrote:Looking at the specs for Stratolaunch and other proposed subsonic launch aircraft I want to ask - is there any significant benefit in lifting your rocket 10km away from the earth and accelerating it to a mere 700-800km/h?
A dedicated rocket's first stage passes that altitude and speed within maybe 30 seconds of flight, but is a much simpler process.
Correct me if I am wrong of course. The only benefit I see of using such a platform would be get you on the preffered orbit since you would be able to fly some distance before launching your payload.
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