Jim - 26/10/2007 10:40 AMQuotepubliusr - 26/10/2007 1:17 PM Had Atlas V used RD-170 and not RD-180--it would have been a great contenter for CLV. An Americanized Zenit with smaller strap-ons would look rather like a scaled up Delta II.That has no bearing. 2 RD-180's could be used
publiusr - 26/10/2007 1:17 PM Had Atlas V used RD-170 and not RD-180--it would have been a great contenter for CLV. An Americanized Zenit with smaller strap-ons would look rather like a scaled up Delta II.
kraisee - 26/10/2007 10:55 AMLM actually did an analysis on that a while back - for their Phase 2 vehicle - and found that there were better engine-out options if two RD-180's were used instead of a single RD-171 (BTW, needs to be the 171 variant because 170 hasn't got full-range gimbal control).Ross.
kraisee - 26/10/2007 3:29 PMI'm not sure there has ever been a successful rocket designed to be able to cope with an engine out around T+1s.
edkyle99 - 26/10/2007 2:56 PMQuotekraisee - 26/10/2007 3:29 PMI'm not sure there has ever been a successful rocket designed to be able to cope with an engine out around T+1s. I think that Space Shuttle can suffer an SSME failure, assuming that it shuts down nice, right off the pad and make an RTLS abort. - Ed Kyle
kraisee - 26/10/2007 1:29 PMThe engine out was available later in the first stage flight, not at liftoff. I forget precisely where it became a possibility, but probably somewhere about half way to tow-thirds of the way through the first stage burn.Ross.
kraisee - 26/10/2007 4:29 PMThe engine out was available later in the first stage flight, not at liftoff. I forget precisely where it became a possibility, but probably somewhere about half way to tow-thirds of the way through the first stage burn.I'm not sure there has ever been a successful rocket designed to be able to cope with an engine out around T+1s. N-1 might have been, but it was never successful.Ross.
TrueGrit - 31/10/2007 5:05 PMLets just say your $500mil is off base... Boeing wrote off nearly $2bil on Delta IV development losses and government only kicked in $500mil...
TrueGrit - 31/10/2007 6:06 PMAs for manrating... Total Delta IV manrating was priced around $500mil during the OSP days, and only a portion was engine related. NASA will likely be able to develop the RS-68B for Ares V for less than half what the Delta IV manrating would have been.
kraisee - 31/10/2007 3:06 PMRS-68 remained on-budget AFAIK.Rocketdyne's own documentation claims the entire development program cost ~$500m through to first flight.Ross.