Tag: engineering

Another asteroid mining company will announce its plans tomorrow, Tuesday.

3:52 pm

The competition heats up: Another asteroid mining company will announce its plans tomorrow, Tuesday.

As I mentioned earlier today, it is important to maintain a skeptical attitude to each of these new commercial space companies, even as we cheer them on enthusiastically. For example, I am very curious how this company has come through with a “breakthrough process for manufacturing in space.” What could this be, and why has no one thought of it before?

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Not all is golden in commercial space: The failure of the Oklahoma spaceport deal.

9:37 am

Not all is golden in commercial space: The failure of the Oklahoma spaceport deal.

It is important that we restrain our enthusiasm for private space and always look with skepticism at any new proposed private effort. It appears that this was something that Oklahoma officials failed to do when they first established their spaceport for Rocketplane, a company now bankrupt.

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Kepler shut down for ten days to save the mission.

9:27 am

Uh-oh: Kepler has been shut down for ten days to save the mission.

The spacecraft was launched with four so-called reaction wheels that spin to help keep the telescope pointing at its target fields of stars. One of these, reaction wheel No 2, failed in July 2012, leaving three to do the maneuvers, including a quarterly roll to a new orientation. Now reaction wheel No 4 has shown early indications that it might fail, prompting its NASA controllers to attempt some long-distance maintenance. They hope that by resting the wheels, their lubricant will spread to ease increased friction.

If this wheel fails permanently, the Kepler mission would be over, as it would be impossible to orient the spacecraft with enough precision with only two wheels.

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A (new) Mexican standoff at the old spaceport.

9:11 am

A (new) Mexican standoff at the old spaceport.

Messier not only provides a detailed analysis of the negotiations on-going between Virgin Galactic and Spaceport America over liability issues, he also provides context, much of which is not encouraging. For example,

SpaceShipTwo is set to begin its first powered test flights later this year using a “starter motor” that will be smaller than the full-scale hybrid engine that will be used for flights into space. The motor will allow pilots to test the space plane in the transonic flight region, which would be a major step forward.

Whether the full-scale RocketMotorTwo engine, powered by nitrous oxide and rubber, will be ready to fly this year is an interesting question. There have been stories for years – persistent, consistent and never really denied – that the motor just doesn’t work very well. Hybrid motors can function effectively for smaller vehicles, such as the smaller SpaceShipOne vehicle that flew in 2004, but are difficult to scale up. SpaceShipTwo is three times larger than its predecessor.

Meanwhile, there are the liability questions which might force Virgin Galactic, and all other private space companies, to flee New Mexico. The analysis suggests that the taxpayers of New Mexico might have paid for a very expensive spaceport that might never pay for itself.

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How the Bigelow module added to ISS will change the space equation.

9:45 am

How the Bigelow module added to ISS will change the space equation.

Looking a bit further down the road, the potential launch of a Bigelow BEAM module, particularly if it takes place on a SpaceX Falcon 9 booster could be a harbinger of much greater things to come. As Mars visionary Robert Zubrin and many others have observed, the addition of an inflatable module similar to that being considered for the station, to the SpaceX Dragon 2.0 capsule greatly increases the available space and capability of a future Dragon to serve both as a Mars transfer vehicle, and / or surface habitat. Add in the introduction of Falcon Heavy, and the pieces for an alternate vision of far more affordable (and timely) inner system exploration begin to fall into place.

Stewart Money has it exactly right. I have never accepted the claim that Orion was the only spacecraft being built that would be capable of going beyond low earth orbit. Add the right components to any manned vehicle, and you have an interplanetary spaceship.

The trick of course is adding the right components. For both Orion and Dragon, the present assumptions are much too nonchalant about what those components are. For humans to prosper on an interplanetary mission, the vessel requires a lot more than a mere capsule and single module.

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The demo mission of robotic refueling of satellites on ISS goes forward this month.

10:02 am

Robot refueling of satellites: The demo mission on ISS goes forward this month.

As much as I celebrate this work, conceived and designed by engineers at the Goddard Space Flight Center (the same people who ran the missions that maintained the Hubble Space Telescope), I worry that nothing will come of it. The demo mission itself is designed to duplicate exactly the refueling of several climate satellites already in orbit whose lifespans are ending merely because they are running out of fuel. If the ISS demo succeeds, the next natural step would be to plan an actual robotic mission to refuel these satellites.

The worrisome part is that NASA rarely follows through on this kind of research. For example, the agency did tests of an ion engine back in the early 1970s, and it wasn’t until the late 1990s before they finally flew a mission using that technology. Worse, the federal budget situation probably means there is no money to fly such a mission.

Hopefully, some private company will take a look at this engineering, which is all in the public domain, and decide to use it for their own purposes.

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New research suggests that the high radiation experienced by astronauts on interplanetary journeys could accelerate the onset of Alzheimer’s.

9:32 am

New research suggests that the high radiation experienced by astronauts on interplanetary journeys could accelerate the onset of Alzheimer’s.

Some caveats: This research was done on Earth with mice. It also assumes that it will be impossible to protect astronauts from all types of radiation while on their journey.

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An ion test engine has set a new record for continuous operation.

9:45 am

An ion test engine has set a new record for continuous operation.

The NEXT ion thruster is one of NASA’s latest generation of engines. With a power output of seven kilowatts, it’s over twice as powerful as the ones used aboard the unmanned Dawn space probe. Yet it is simpler in design, lighter and more efficient, and is also designed for very high endurance. Its current record of 43,000 hours is the equivalent of nearly five years of continuous operation while consuming only 770 kg (1697.5 lbs) of xenon propellant.

This engine will make the unmanned exploration of the asteroid belt extremely easy and practical.

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It appears that SpaceX and Orbcomm have finalized their launch agreement.

11:00 pm

The competition heats up: It appears that SpaceX and Orbcomm have finalized their launch agreement.

On December 21, 2012, ORBCOMM Inc. (Nasdaq: ORBC) and Space Exploration Technologies Corp. (SpaceX) entered into a Launch Services Agreement pursuant to which SpaceX will provide launch services for the carriage into low-Earth-orbit of up to 18 ORBCOMM second-generation commercial communications satellites currently being constructed by Sierra Nevada Corporation.

The agreement schedules the launches for sometime between the second quarter of 2013 and the second quarter of 2014, subject to normal scheduling changes.

This is a strong endorsement by Orbcomm of SpaceX’s Falcon 9 rocket, despite the engine problem which prevented an Orbcomm prototype satellite from reaching its correct orbit on the last Falcon 9 launch. Also, note that Sierra Nevada is building the satellites, thereby giving that company a firm foundations while it also builds its Dream Chaser manned spacecraft.

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