Talk-Polywell.org

Giorgio wrote:

Skipjack wrote:

Giorgio wrote:Maybe you meant "more than 10% of the F9 first stage"?
Added weight to the first stage does not really affect payload mass as much. It is more relevant for the BFS though, which is a second stage and there every added kg means a kg less payload.

well every added KG would mean 2.7 KG less payload. minor but we understood.what you meant .

The fins were added to add drag and more than controlled flight of the rocket. The rule of thumb is that aerobraking can kill a velocity approximately equal to the escape velocity of the planet where the aerobraking is performed 11 km/s for Terra, 5 km/s for Mars. That equals a lot of fuel. Robert Zubrin says mass of the heat shield and thermal structure should be about 15% of the total mass being braked. Which sounds like a lot, but is often much less that the propelant required to brake with rocket thrust.
Think like the EA6-B speed brake(sort of) or the tail structure of the shuttle.
The deceleron is an aileron that functions normally in flight but can split in half such that the top half goes up as the bottom half goes down to brake.
The use of two flaps per wing on the BFR, with one flap opening upwards and the other opening downwards, allows the most rapid deceleration while maintaining accurate control of the spacecraft. Flaps that open upwards create a downforce in addition to reducing air speed, thus forcing the spacecraft towards the ground; conversely, flaps that open downwards create an upforce which pushes the nose of the spacecraft into the air. Wing-mounted air brakes that open in both directions allow the opposing upward and downward forces to cancel each other out, creating resistance that forces the spacecraft to rapidly decelerate.
The material science behind this method is actually a lot simpler than aero brake/ capture. the downside is a failure would most likely result in a loss of craft.

paperburn1 wrote:

Giorgio wrote:

Skipjack wrote:

well every added KG would mean 2.7 KG less payload.

How is that? Technically it does not matter whether the kg is payload or space ship mass.

Sorry error upon error , What I needed to say it takes 27 KG of fuel to get one more KG to orbit. (pesky little decimal places)
secondly I for some reason assumed you were keeping the payload the same ...I don,t know I need to start breaking those pills in half or taking twice as many.
Florence had me rattled as well but all is good and hopefully forgiven.

https://www.space.com/42033-spacex-rock ... unday.html

just like the east coast but backwards..right?

Launches from Vandenberg are used for polar orbits.

https://www.youtube.com/watch?v=Pj2a0ZiB3OI
now

Pretty launch tonight. Uneventful, but pretty. Wonder whether they caught themselves a fairing today

They didn’t even try to catch. No reason was given, but rough seas + night attempt may have been factors.

Awesome time lapse:
https://www.reddit.com/r/interestingasf ... _9_launch/

Maui wrote:They didn’t even try to catch. No reason was given, but rough seas + night attempt may have been factors.

Awesome time lapse:
https://www.reddit.com/r/interestingasf ... _9_launch/

I have read they have already announced no fairing recovery attempt owing to impact area sea state.

Yeah, I saw
Well, lets hope for better luck next time!

And yet another breathtakingly routine launch and recovery...
Man, almost not worth making popcorn for these anymore.

The first BFR will be a popcorn event

paperburn1 wrote:The first BFR will be a popcorn event

Hopefully not because it's loaded with it...

https://abc11.com/us-russia-astronauts- ... h/4459999/

Another russian based failure to the ISS, they better start paying those guys again.
“There needs to be more transparency, and better wages for ordinary engineers,” said Mr Luzin. “It’s absurd that a rocket engineer is earning $400 a month while Mr Rogozin and his bureaucrats are flying business jets.”

Low wages bar people with ambition from entering the profession, said Mr Luzin. But it is not the only reason why young engineers aren’t coming in to replace the Soviet-trained generation. Since the space sector is classified as a military industry, specialists are by law prohibited from travel or work abroad. “The clever youngsters keep well away,” said Mr Luzin.

James Oberg, a retired Nasa Space Shuttle mission control specialist, told The Independent that the Russian space industry is beginning to resemble a “medieval order of soldier monks”. Those specialists who remained are capable and dedicated, he said, “but they are now all dying at their posts”.
The Soyuz MS-10 spacecraft launched from the Baikonur Cosmodrome in Kazakhstan to the International Space Station at 4:40 a.m. EDT Thursday, October 11 (2:40 p.m. in Baikonur) carrying American astronaut Nick Hague and Russian cosmonaut Alexey Ovchinin. Shortly after launch, there was an anomaly with the booster and the launch ascent was aborted, resulting in a ballistic landing of the spacecraft.

Search and rescue teams were deployed to the landing site. Hague and Ovchinin are out of the capsule and are reported to be in good condition.

Let's not forget that congress cut the funding for commercial crew by 67% between 201 to 2013 and continued to underfund it thereafter, which resulted in the delays of commercial crew and the continued reliance on Russian Soyuz.