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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/DFQ4QH5453J576MZOHP3KJHEARRF4IMU/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "DFQ4QH5453J576MZOHP3KJHEARRF4IMU",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/DGGU2YTLPFYOY2EP3FRBL3WMWIQTY2T7/?format=api",
    "sender": {
        "address": "ko6th_greg (a) hotmail.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Greg D.",
    "subject": "[amsat-bb] Re: Boost To higher Orbits?",
    "date": "2009-12-02T07:14:11Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/PSXWQGB526Z2ZA6WA6LEND4AIGV5R2M7/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\n\n\n> Date: Tue, 1 Dec 2009 11:20:45 +1100\n> To: [email protected]; [email protected]\n> From: [email protected]\n> CC: [email protected]\n> Subject: [amsat-bb] Re: Boost To higher Orbits?\n> \n> At 11:17 PM 11/30/2009, Bob McGwier wrote:\n> \n> >p=hk  where p is momentum,  k is Planck's constant, and k is an integer.\n> >\n> >So when a photon is captured or reflects/scatters, it transfers\n> >momentum. This equation is used to determine how much momentum is being\n> >transferred.\n> >\n\nSo, the discussion is about the fundamentally  different ways to cause force to be applied to the satellite. \n\nMost of the time we operate by Newton's 3rd law, throwing parts of the satellite out one end, with the knowledge that doing so will push the remaining parts of the bird in the other direction.  We call them rockets.\n\nConservation of Momentum is just another aspect of Newton's 3rd law.  Any time you cause something with mass to move differently, there's always a got to be a balancing force.  Bouncing photons off a sail is only different from a rocket in that the rocket is shedding parts of itself as it works, while the photons are external.  And a they are lot lighter (no pun intended), so it takes a whole lot of them to have the same effect, making it less than practical.\n\nLooking at the other laws of physics we have Bernoulli's principle, where the increased velocity of a fluid over a curved surface causes a pressure drop which can push the surface in the direction of the lower pressure.  We call them propellers and lanteen sails.  Is there any way to use this principle with the solar wind?  I think that was answered as a theoretical yes, but a practical no.\n\nSo what remains?  What about magnetic or electrostatic forces?  Friction?  Anything else I missed?\n\nIt would sure be nice to be able to propel a satellite without tossing bits of it overboard.\n\nGreg  KO6TH\n\n\n \t\t \t   \t\t  \n_________________________________________________________________\nGet gifts for them and cashback for you. Try Bing now.\nhttp://www.bing.com/shopping/search?q=xbox+games&scope=cashback&form=MSHYCB&publ=WLHMTAG&crea=TEXT_MSHYCB_Shopping_Giftsforthem_cashback_1x1",
    "attachments": []
}