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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/6FTP6OJ2TUCXMUVFGA6UKF2NVWJIIQVK/?format=api",
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    "message_id": "001601c6cf69$686c6dd0$62bfe144@youre7075dc078",
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    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/KXOI5BQP7TJGGOINAIMKV5NB4C25QMKS/?format=api",
    "sender": {
        "address": "jmfranke (a) cox.net",
        "mailman_id": "6c3cc6aaa29f4579900a911c323147b7",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/6c3cc6aaa29f4579900a911c323147b7/emails/?format=api"
    },
    "sender_name": "jmfranke",
    "subject": "[amsat-bb] Re: I: ionic propulsion motor",
    "date": "2006-09-03T14:58:25Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/LF7EVC7OOAKG4KTPPLMSH5QFIPX64WZ6/?format=api",
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        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/PWM2CYTA3L5EM4V6HDJUSOV4YLYW37QR/?format=api"
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    "votes": {
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    "content": "The arcjet and the ion drive are different.\n\nThe arcjet uses an electric arc to heat a gas/fluid/solid.  The expanding \ngas/plasma then works like a conventional rocket motor.  One of the valuable \nattributes is that the gas/fluid/solid need not be combustible, hence it is \nsafer than a conventional rocket.  Also, higher temperatures can be \nachieved, and hence larger expansion ratios can be obtained.  The arcjet is \nnormally easier to regulate than conventional chemical rockets.\n\nThe ion engine uses electrostatic force to drive or push against ions.  The \nthrust is derived from the electrostatic force acting against a heavy ion. \nFor a given accelerating voltage, thrust is proportional to the atomic mass \nof the propellant.  There is also an accompanying electron gun that adds a \nsmall thrust, but is primarily added to neutralize the emitted ion cloud so \nthe ions are not attracted back to the spacecraft which, without the counter \ncurrent electron gun, would be developing a negative charge.\n\nHope this helps,\n\nJohn  WA4WDL\n\n----- Original Message ----- \nFrom: \"Félim Doyle M3HIM\" <[email protected]>\nTo: \"Greg D.\" <[email protected]>; <[email protected]>\nSent: Sunday, September 03, 2006 6:14 AM\nSubject: [amsat-bb] Re: I: ionic propulsion motor\n\n\nGreg,\n\nBy 'ion motor' I take it you are referring to the Ammonia powered arcjet. I\ndid not realise that the two were synonymous. The following items would\nindeed suggest that they are similar if not the same concept.\n\nhttp://www.esa.int/SPECIALS/SMART-1/SEMLB6XO4HD_0.html\nhttp://www.daviddarling.info/encyclopedia/A/arcjet.html\n\nHistorically, I have had a much different idea of ion drive which did not\ninvolve ejecting gas at high speed. If anyone has the time, I would\nappreciate being enlightened.\n\n73 de\n\nFélim M3HIM\nIO91ot\nAylesbury, Buckinghamshire, UK\n----- Original Message ----- \nFrom: \"Greg D.\" <[email protected]>\nTo: <[email protected]>\nSent: Saturday, September 02, 2006 8:28 PM\nSubject: [amsat-bb] Re: I: ionic propulsion motor\n\n\n> How does this compare to the ion motor we had on AO-40?  Also, is there an\n> English translation anywhere?  I get the general idea looking at the\n> pictures, but the details escape me.\n>\n> Thanks,\n>\n> Greg  KO6TH\n>\n>\n> ----Original Message Follows----\n> From: \"Francesco Grappi\" <[email protected]>\n> To: <[email protected]>\n> Subject: [amsat-bb]  I:   ionic propulsion motor\n> Date: Sat, 2 Sep 2006 10:47:14 +0200\n>\n> HI Luc,\n>\n> Very interesting animation and explanation ...\n> Thank you\n> 73\"\n> Francesco IW4DVZ\n>\n>\n> -----Messaggio originale-----\n> Da: [email protected] [mailto:[email protected]]Per\nconto\n> di Luc Leblanc VE2DWE\n> Inviato: sabato 2 settembre 2006 9.27\n> A: [email protected]\n> Oggetto: [amsat-bb] ionic propulsion motor\n>\n> HI\n>\n> Here is a link explaining the ionic motor propulsion system with a nice\n> animation (in French) the\n> SMART-1 first lunar European space probe will crash on the moon on\nSeptember\n> 3 at 0541 UTC.\n>\n>\n> Could be usable for our HEO fleet? It seems pretty simple at the first\nlook.\n>\n> http://www.radio-canada.ca/nouvelles/AFPanimation/SmartFR3008/\n>\n> \"-\"\n> The medium is the message...The content is the audience...;)\n>\n> Luc Leblanc VE2DWE\n> Skype VE2DWE\n> www.qsl.net/ve2dwe\n>\n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>\n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>\n>\n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n\n_______________________________________________\nSent via [email protected]. Opinions expressed are those of the author.\nNot an AMSAT-NA member? Join now to support the amateur satellite program!\nSubscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n\n\n",
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