Rob Davidoff

@TJ_Cooney @JeffBezos Really impressive, I was hoping somebody would be able to do that when I saw the seam. Do you have the frames to do the same thing for around 25-28s where the booster and capsule are further away and the booster is ore side-on?

I was able to remove the seam between the lenses, a sunning shot @JeffBezos! Looking forward to seeing more videos like this.

@JacobKluding @brickmack At about 20km long and 4 km wide in GEO, from the ground, the station would be about 2 by 0.4 arcseconds. About the size of an "I" on the line below 20/20 on the eyechart, I think? Mostly just barely notably not a dot, but with shape visible in binoculars.

@brickmack God Bless the Thing. I wonder what this would look like from the ground? I expect it'd be a lot further out, though.

This is one of the two solar array wings of the Rockwell International space solar power satellite. The International Space Station is shown for scale (you may have to zoom in to see it)

@dominickmatthew @astro_Pettit Is this available on any other website like Youtube? I'd like to link this but not from this site.

Don (@astro_Pettit) and I decided to demo how spaceships could transfer rocket fuel (AKA propellant) in space using water bottles, water, and Alka-Seltzer . . . what could go wrong?

@bscholl @boomsupersonic Thank you! It's interesting to see how bypass pays off for supersonic vs the early generation of similar bypass ratio subsonic engines back in the 60s.

@eofpi @boomsupersonic About 20% better specific fuel consumption versus Olympus 593. Our current target is 0.95 SFC at Mach 1.7.

We're building a supersonic airliner—powered by the all new @boomsupersonic Symphony engine. Ask me anything!

@bscholl @boomsupersonic I see you did address bypass ratio being about 3 in some other comments, but anything about fuel consumption would be interesting (interested in comparing to Concorde's Olympus engines).

@bscholl @boomsupersonic Anything you can say about bypass ratio or thrust-specific fuel consumption? (Apologies if this is posted publicly someplace and I've missed it.)

@wooxheo @TAbusnardo @JohnPau88413033 @stoke_space pdf page 25: "Stage 1 and Stage 2 would break up upon reentry and would be expended into the ocean under the current Proposed Action. The potential reuse of the rocket would be analyzed in a separate NEPA document as the program matures."

@TAbusnardo @JohnPau88413033 @stoke_space “Reusable — no”? That’s strange

Hope we get more info on @stoke_space ambitions with Nova. They've said they wanna be able to launch and relaunch in 24 hours but it'd be cool to hear how quickly they plan on growing to that.

@rainmagic9 @kmh @torybruno So I bet you install one, rotate the whole vehicle in the tooling, then install the other. The image with the engine positions not level Tory shared may be mid-rotation, hence everyone standing around and the second engine being craned in but not yet in final install position.

@rainmagic9 @kmh @torybruno I think there's a step between installing the two engines where they have to rotate the entire core 180 degrees. If you look at CERT-2, the engines have their turbopump stacks opposite directions for radial symmetry, but the two engines sit on their transport cradles the same way

For your viewing pleasure. The second BE4 engine being installed on the #VulcanRocket slated for our first Space Force mission this year.

@rainmagic9 @torybruno Also, if the rocket is horizontal, depending on boat-tail design, you can support the engine with a crane or something like seen here, and bring it up to the rocket relatively cleanly. Vertical rocket, you can't lift from above and have to support from below.

@rainmagic9 @torybruno Accessibility to engines vs rest of rocket has a lot to do with it, I think. If the engines are installed with the rocket vertical, then all the engines can be accessed from one work height, while install with the rocket horizontal allows easier access to the rest of rocket.

@capt_ramius @torybruno Regenerative

@torybruno Fuel loops to regeneratively cool the nozzle, or ablative?

Unboxing rocket style…. We have now received all of the BE4s needed for all of Vulcan’s 2024 manifest.

@KillerOfNightVR @ThunderWolf08 You can download footprint drawings from the environmental approval here: railroads.dot.gov/rail-network-d… (Attachment F) Lucid Stew used these to make a video that's up on Youtube attempt to animate the line: youtube.com/watch?v=hXF_g_…

Construction starts on the Brightline West HSR today!!

@StarfleetDesign I wonder if a similar effect explains the jump in Season 4 of Voyager, Seven's introductory season.

@Truthful_ast Do you have dates or document links for these images?

Early design of ESA's ATV.

@hutcheson_otis @GTCarfree Authority says it'll have canopies here: twitter.com/CaHSRA/status/…

Station 5% Parking 65% Solar Farm 30% someone who is good at land use planning please help me budget this. my high-speed rail is dying

@Orbital_Perigee Vacuum engines are just like that, you don't need a lot of pressure to get good ISp. Compare that the SSME and RL-10 have about the same vacuum ISp...

you know how funny it is that current mvac has the same ISP as the rd-120 (gas gen vs ORSC) (348s+ vs 350s) (Given that this ISP was with the first version of the M1D, I would think that the ISP might be a bit higher…)

@torybruno @TrevorMahlmann @ulalaunch Thanks. Trevor did all the hard work (well, all the hard work not already done by your team). I just did a quick photoshop scale & overlay.

@eofpi @TrevorMahlmann @ulalaunch Cool

Atlas V: vs Vulcan: