Re: SpaceX News
Posted: Tue Feb 06, 2018 11:50 pm
For another boring launch I got very excited
Center booster ran out of triethylborane and could not restart two of three engines required for a controlled decent to the drone ship LZ.
I've found nothing yet to see that TMI was actually executed. Which could mean there's a nice Tesla Roadster a couple of thousand miles up, just for the taking.TDPerk wrote:They got the boosters back!
2nd stage coasting nominally to TMI burn.
I'm a belter and I never really have been all that enthusiastic about going to Mars, anyway. Musk has shown signs of being a closet belter as well, and this may have been his plan all along. Mars has crowd appeal, but mining asteroids is a better business model.krenshala wrote:They did the burn about six hours after launch. It ended up not being a proper Trans-Mars-Injection burn, however. Its more like a Trans-Ceres-Injection burn, clear into the Belt, if not quite to Ceres orbit.
I'd call that a success on showing off what its heavy lift rocket design can do, even if they did lawn dart the center core into the ocean at 500km/h due to two of the three retro-burn engines not igniting as they should have.
This was the first thing I thought of when I saw the shot of the Earth behind the roadster. Glad to see I wasn't alone in that.
ladajo wrote:Once he establishes a heavy lift to LEO and beyond, I foresee cargoes that were/are only fantasy now becoming reality in the next 2 to 3 years. Like for example, a Lagrange Station, and permanent moon facilities within the decade, with the precursor or establishing lifts done with Falcon Heavy. We are on the precipice of the next age methinks. Now, what we call it, Space Expansion, Solar Age, or whatever is not so important. It is the getting off Rock 0 in a permanent fashion.
Space Missions to Mars up to now have been small satellites where the entire mission was launched from Earth. The delta-V has been about 3.2 to 3.5 kilometers per second.
By refueling the SpaceX BFR in orbit and assembling a few stages in high orbit, a large chemically powered space mission can get up around 9.0 kilometer per second delta-V.
We will not need to wait decades for super-advanced space propulsion to be developed for less than 60-day trips to Mars. Elon Musk and SpaceX should have the BFR flying within 5 years.
Short 45-60 day or even 30-day trip using large multi-stage chemical rockets launched from high orbits after refueling will make large fast missions easy. The shorter times mean far less radiation and health issues for astronauts and passengers. The far larger ships means water and other material for radiation shielding.
Bigger and more powerful spaceship will be like cruise ship versus dingy
The Mars missions we have sent have been less than 1000 kilograms but putting a few BFR payloads together could send 1000-ton Mars missions.
SpaceX is bringing the next BIG future in space.
In World War 2, after D-Day there was 8,500 tons per day of cargo being sent to the beaches. Fifty SpaceX BFR would be able to regularly shuttle that amount of material to orbit. We will be able to invade space (moon, orbits, lagrange points, Mars) the way Europe was invaded by the allies.
Power starved up to now
The low power and delta-V budgets have forced space mission planners to use slower hohmann transfers. Those are the most economical but are long circular orbits that look more like orbits around the sun than targeting a flight to Mars.
Elliptical and parabolic orbits have less curve and are much shorter and much faster trips.
NASA has calculated faster trips where a mission is assembled or refueled in high orbits.
Earth-Moon Lagrange 2 or EML2 is one of 5 locations where earth’s gravity, moon’s gravity and centrifugal forces all cancel out. It lies beyond the far side of the moon at about 7/6 of a lunar distance from earth.
EML2 would make a great transportation hub. Not only for travel to destinations throughout the solar system but also within our own earth moon neighborhood.
The SpaceX BFR will be fully reusable and able to carry 150 tons for Earth to Low Earth Orbit but it could refly once to seven times per week. So a lot of refueling missions and taking large pieces of space stations and moving large payloads between low earth orbit, high orbits, moon and lagrange points will be easy.
Place Multiple Bigelow Hercules resupply depots at each Lagrange point, various Earth orbits, lunar orbit and Mars Orbits