* v1.1 has not flown. From a propulsion standpoint it's sufficiently different than a v1.0 that it shouldn't be called a flown vehicle. Especially if you throw the 5 m fairing into the mix.* FH premium is only lower if you assume the price advertised for "Greater than 6.4 ton to GTO", otherwise the listed "commercial" price is $83 M
v1.1 is quite similar to v1.0. The environment is sort of known.
v1.1 is quite similar to v1.0.
Quote from: baldusi on 12/10/2012 04:43 pmv1.1 is quite similar to v1.0.I think thrid mission of F1 wants to talk with you. Something about ablative vs regenerative cooling and thrust transients, I dunno.
Why are the prices so high?-- Falcon 9: $M 97 / 54 = 1.8-- Falcon H: $M 165 / 128 = 1.3
Presumably the USAF certification efforts will occur for the first launch. The FH launch will only require certification of the differences. So if things like avionics, engines, structures, sep mechanisms, power, etc. are the same between the two, they won't have to be re-rubber-stamped.
From the document:Insertion Orbit #1Deliver the IPS to a circular orbit with an orbital altitude of 720 km and an orbital inclination of 24º. Deploy only the COSMIC-2 payload set, up to six APLs (TBR), and actuate up to eight P-PODs (TBR).Insertion Orbit #2Deliver the IPS (with remaining payloads) to the elliptical orbit with a perigee of 6,000 km, apogee of 12,000 km, and an orbital inclination of 45º. Deploy the DSX payload followed by remaining APLs and actuate remaining P-PODs. After deployment of these payloads, the LV shall enter a coast phase of [3 hours threshold, 5 hours objective]. After the coast phase, the LV shall execute an upper stage restart with a minimum duration of 5 seconds (TBR).This looks like at least 5 burns of the second stage to me, over many hours. #1, get into orbit with a 720 km apogee, 24 inclination. #2, circularize at 720, release first payload. #3, Next equator crossing, boost to a 6000 km perigee. Coast until apogee, #4, boost to a 12000x6000 orbit and change plane to 45º. Wait the required 3 hours for the final stage restart (#5).
If I remember correctly the M1C (not the MVAC) was mentioned having 10 TEB's to support multiple rapid countdown reset starts.
Quote from: oldAtlas_Eguy on 12/14/2012 03:39 pmIf I remember correctly the M1C (not the MVAC) was mentioned having 10 TEB's to support multiple rapid countdown reset starts. I thought that was implied for ground storage at the pad, not onboard TEA/TEB?
Quote from: ugordan on 12/14/2012 03:51 pmQuote from: oldAtlas_Eguy on 12/14/2012 03:39 pmIf I remember correctly the M1C (not the MVAC) was mentioned having 10 TEB's to support multiple rapid countdown reset starts. I thought that was implied for ground storage at the pad, not onboard TEA/TEB?If someone who knows which thread the discussion of TEB count on the M1C was on then the actual source (if any) for the reference can be determined and maybe part of the answer for just how many restarts a M1DVAC can do will be answered. Adding extra Helium tanks is not difficult. Redesing the engine is.edit fix grammer
That is an answer to an open question: How many restarts a Merlin-1D-Vac can perform. Five seems to be a pretty big number.
How many can Centaur or DCSS do? I'd be willing to bet it's the same as MVAC...
Quote from: simonbp on 12/17/2012 02:33 pmHow many can Centaur or DCSS do? I'd be willing to bet it's the same as MVAC...Doesn't the RL-10 use LH boil off to spin up the turbine, and a spark plug as an igniter, so the answer would be as many as it has fuel and battery for
TEB for ignition and Helium for spin limit number of restarts