https://ted2018.ted.com/speakers#gwynne-shotwellGwynne Shotwell at TED
Erik Cleven @VoltzCoreAudioReplying to @elonmusk and 3 othersHas the BFR/BFS been stretched in height? The video Gwynne showed at Ted Talks looks taller than the one in the E2E videoElon Musk ✔ @elonmuskMaybe a little 😉3:09 AM - Apr 13, 2018G C @SmileSimplifyReplying to @elonmusk and 2 othersWhich section/stage was stretched: 1st or 2nd or both stages?Erik Cleven @VoltzCoreAudioPossibly both according to this pic.twitter.com/VWR4L6Kpez3:27 AM - Apr 13, 2018
u/Intro24 on Reddit used an un-distorted image to get a better size comparison.https://www.reddit.com/r/SpaceXLounge/comments/8bznue/bfr_2018_size_comparison/Looks like its just taller than the Saturn V (Elon couldn't let that slide ). Also to me it looks like the legs sit in a little tube that extends past the ship to the booster. My theory is that the pushers that will separate the stages sit inside the tubes that are on the booster and will push against the bottom of the legs, instead of having separate points like Falcon 9. Thoughts?
If that stretch is around 20%, that could put Raptor above 2MN, 450klbf.That's a beast of an engine.
Quote from: AncientU on 04/13/2018 03:38 pmIf that stretch is around 20%, that could put Raptor above 2MN, 450klbf.That's a beast of an engine.31 engines is not optimal packing density on the booster. There is room for improvement to the engine packing density and hence thrust density by either going with 37 (1,6,12,18) Raptors of the same physical size as the dev. raptor operating at 25MPa or higher or 19 (1,6,12) larger Raptors of c.3MN at SL operating at the same pressure. Using dev. raptor size for ship will allow for greater engine out capability by requiring more engines. Raptor may be easier to scale than 1st thought and can be produced in multiple sizes without too much cost and difficulty. Optimizing engine packing density on booster will allow for a stretch without having to increase Raptor Pc. Further booster stretching can of course be facilitated by increasing Raptor Pc. which is a long term goal.Don't be surprised if the Raptor no. on the booster changes again in the next BFR update.
Erik Cleven @VoltzCoreAudioReplying to @elonmusk and 3 othersHas the BFR/BFS been stretched in height? The video Gwynne showed at Ted Talks looks taller than the one in the E2E videoElon Musk ✔ @elonmuskMaybe a little 😉3:09 AM - Apr 13, 2018
Quote from: docmordrid on 04/13/2018 10:58 amErik Cleven @VoltzCoreAudioReplying to @elonmusk and 3 othersHas the BFR/BFS been stretched in height? The video Gwynne showed at Ted Talks looks taller than the one in the E2E videoElon Musk ✔ @elonmuskMaybe a little 3:09 AM - Apr 13, 2018Here is a comparison between stills from the IAC Adelaide presentation and Jdeshetler's stabilised video. If there is a difference, it's very small.
Erik Cleven @VoltzCoreAudioReplying to @elonmusk and 3 othersHas the BFR/BFS been stretched in height? The video Gwynne showed at Ted Talks looks taller than the one in the E2E videoElon Musk ✔ @elonmuskMaybe a little 3:09 AM - Apr 13, 2018
I suspect from that tweet that it hasn’t stretched at all except perhaps some trivial amount
Under consideration. We’ve already stretched the upper stage once. Easiest part of the rocket to change. Fairing 2, flying soon, also has a slightly larger diameter. Could make fairing much longer if need be & will if BFR takes longer than expected.