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      CommentAuthorAngus
    • CommentTimeAug 5th 2019
     
    Of course that's true. My point is that I don't trust you or your gas company to ensure that the burning and escape are controlled.
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      CommentAuthorTrim
    • CommentTimeAug 5th 2019
     
    So tax or fine them, leaving methane in the wild is just asking for trouble.
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      CommentAuthorAngus
    • CommentTimeAug 5th 2019
     
    That is a point. So what we should do is flare off all the peat bogs to be sure.
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      CommentAuthorTrim
    • CommentTimeAug 6th 2019
     
    Study shows how to produce natural gas while storing carbon dioxide.


    https://phys.org/news/2019-06-natural-gas-carbon-dioxide.html Shttps://phys.org/news/2019-06-natural-gas-carbon-dioxide.html

    Posting this again.
    .
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      CommentAuthorAngus
    • CommentTimeAug 7th 2019
     
    Some of the largest US cities emit more than double the amount of the potent greenhouse gas methane than had been estimated, as shown by air samples collected on research flights.

    Methane is burnt in homes as fuel for heating and cooking. It is known to leak from distribution pipes and appliances, but such leakage isn't closely monitored in urban centres.

    Eric Kort and Genevieve Plant at the University of Michigan in Ann Arbor and their colleagues sampled the air down wind of 6 large cities, including Washington DC and New York City, on 20 research flights in 2018. They found that these cities collectively emit almost one million tonnes of methane per year — more than twice the amount reported in existing inventories.

    Fugitive natural gas that had leaked from supply lines and homes made up the bulk of the observed emissions. Estimates of methane leaks from the gas supply chain in the United States should be revised upwards to account for urban losses, the team says.

    Geophys. Res. Lett. (2019)


    Sending methane to customers is also asking for trouble.
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      CommentAuthorTrim
    • CommentTimeJan 2nd 2020
     
    Astroliner
    American air-launched orbital launch vehicle. The Kelly Space & Technology Astroliner Space Launch System was a two-stage-to-orbit, towed space launch concept. Towing an aerodynamic vehicle to an altitude of 6,000 m yielded higher system performance due to vacuum engine performance, reduced drag and gravity losses, and aerodynamic lift during flight.
    Status: Design 2002. Payload: 5,000 kg (11,000 lb). Height: 48.00 m (157.00 ft). Diameter: 6.20 m (20.30 ft). Apogee: 185 km (114 mi).

    After separation from the 747 towing aircraft at 6,000 m and Mach 0.8, the Astroliner would boost itself to 2750 m/s and 110 km altitude before releasing an expendable upper stage (4.2 m diameter x 7.6 m long) and payload (4.85 meter diameter x 7.56 meter long). The upper stage was capable of delivering a 5,000 kg payload into a 185 km 28.5 deg orbit at a cost per launch of $ 22 million - 40% of the cost of existing launchers.

    Following release of the upper stage, Astroliner would continue on its suborbital trajectory, re-enter the atmosphere, and land at a conventional runway. The contemporary Pioneer Rocketplane Pathfinder design of the same period had a similar approached, but used aerial refueling instead of towing to reach a similar launch point. The first operational flight for the Astroliner was planned in 1999 for early 2002.

    Crew Size: 1. LEO Payload: 5,000 kg (11,000 lb) to a 185 km orbit at 28.00 degrees. Launch Price $: 22.000 million in 1999 dollars.

    Family: aircraft-launched, orbital launch vehicle, Rocketplane, US Rocketplanes. Country: USA. Launch Vehicles: Astroliner. Agency: Kelly.
  1.  
    It's a funny thing. Tesla has no real competition and neither does SpaceX.
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      CommentAuthorTrim
    • CommentTimeJan 2nd 2020
     
    It was going so well and suddenly it stopped.

    https://en.m.wikipedia.org/wiki/Eclipse_project_(NASA)

    I only brought it up again because I thought it might help with one or two problems with Skylon.

    Skylon has to have its wonderful Sabre engines on its wing tips because it needs a cargo bay and a large liquid hydrogen tank, this adds to complexity and costs.

    Designing a four engine more rugged Skylon as a tow craft that could tow another rocket propelled space craft and supply it with liquid oxygen as it went along might be helpful.

    The second craft needn't be a spacecraft but a supersonic airliner.

    Or of course Skylon could be adapted to be a first stage reusable air breathing booster.
  2.  
    It would save a lot of trouble if everybody just stayed home.
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      CommentAuthorTrim
    • CommentTimeJan 3rd 2020
     
    And starve?
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      CommentAuthorAngus
    • CommentTimeJan 3rd 2020
     
    That saves even more trouble.
  3.  
    Amazon delivers! You won't starve.
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      CommentAuthorTrim
    • CommentTimeJan 3rd 2020
     
    So the drones do all the work.
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      CommentAuthorTrim
    • CommentTimeJan 20th 2020
     
    • CommentAuthorAsterix
    • CommentTimeJan 20th 2020
     
    The Roosians are playing with it now

    Apparently D-Dalus funding dried up, the CEO of IAT21 retired, so likely a dead project.

    But there are other problems:

    As with early cyclocopters, when takeoff was achieved, maintaining stability was virtually impossible. “For the initial launch phase of the craft when it escapes ground-effects, the response to myriad thrusts, gusts and reflections places exceptional demands upon the flight control software," says Wills.
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      CommentAuthorTrim
    • CommentTimeJan 20th 2020
     
    Thanks.
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      CommentAuthorTrim
    • CommentTimeJan 21st 2020 edited
     
    •  
      CommentAuthoraber0der
    • CommentTimeJan 21st 2020 edited
     
    'My 1st ATARI ST had a StartROM.