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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/U3XUCYTAFPU4MNKM356JZNFEO3XGVKRZ/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "U3XUCYTAFPU4MNKM356JZNFEO3XGVKRZ",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/U3XUCYTAFPU4MNKM356JZNFEO3XGVKRZ/",
    "sender": {
        "address": "rhyolite (a) nettally.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Joe Leikhim",
    "subject": "[amsat-bb] Re: Model Rocket Booster Engine for Picosatellite",
    "date": "2012-01-18T05:16:38Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Like any design a cost-benefit analysis would be required to determine \nif the Gatling arrangement is even necessary. I am sure there are about \na dozen ways to \"skin the cat\". (My apologies to my pet cat Mac)\n\nOn 1/17/2012 11:04 PM, Gary \"Joe\" Mayfield wrote:\n> This is a fun thought exercise.  The gatling gun is one option.  I prefer\n> something with no moving parts.  It should be possible (not easy) to center\n> one engine on each side.  That would be six engines.  Once in orbit take the\n> time to stabilize the satellite along the first axis before firing the first\n> engine to boost the orbit.  Repeat the process up to 5 times.  Wow - This is\n> rocket science!\n>\n> 73,\n> Joe kk0sd\n>\n> -----Original Message-----\n> From: [email protected] [mailto:[email protected]] On\n> Behalf Of Joe Leikhim\n> Sent: Tuesday, January 17, 2012 5:33 PM\n> To: Ken Ernandes\n> Cc: [email protected]\n> Subject: [amsat-bb] Re: Model Rocket Booster Engine for Picosatellite\n>\n> I have developed the perfect solution;\n>\n> A gatling gun type canister for the rocket motors would solve all of\n> your objections per below:\n>\n> On 1/17/2012 4:22 PM, Ken Ernandes wrote:\n>> How would attitude be controlled so the thrust is in the correct\n> direction?  Spin stabilization about the maximum moment off inertia axis is\n> probably the best choice.  This would require a magnetic torquing system.\n>\n> Yes just like other missions.\n>> Another issue is the thrust needs to be directed through the spacecraft's\n> center-of-mass or there will be stability problems.  How would a cluster be\n> fired individually with each, in turn, directed through the center of mass?\n> That's a complex design problem.\n>\n> A motorized canister with 6 to 8 motors aligned such that the active\n> motor is aligned through the COM. Picture a revolver or gatling gun.\n>> One more issue is that when you carry multiple motors, the first must\n> accelerate the mass of the unfired motors, so the early firing will be less\n> effective.  The mass of the spent casings will need to be accelerated buy\n> the subsequent motor firings.\n>\n> Spent casings would be ejected using the ejection charge normally used\n> for deploying a parachute. Just as with any fuel, the mass of the\n> unfired fuel will create mass for the initial firings.\n>> You do have some work to do before you have a practical solution.\n> Work is done. Took about 4 minutes. Coffee break now!\n>> 73, Ken N2WWD\n>>\n>> Sent from my iPad\n>>\n>>\n>>\n>> On Jan 17, 2012, at 3:44 PM, Joe Leikhim<[email protected]>   wrote:\n>>\n>>> David;\n>>> There are some much bigger motors! Ask the Level-3 rocketry folks! Anyway\n> a cluster of medium sized motors could be fired individually as required to\n> raise altitude. I would think that SRB's would be more reliable and safer\n> than hypergolic used on previous Oscars. There would of course be a lot of\n> heat in the rocket casings that would need to be dissipated.\n>>> -- \n>>> Joe Leikhim\n>>>\n>>> Leikhim and Associates\n>>> Communications Consultants\n>>> Oviedo, Florida\n>>>\n>>> www.Leikhim.com\n>>>\n>>> [email protected]\n>>>\n>>> 407-982-0446\n>>>\n>>> Note to GMail Account users. Due to an abnormally high volume of spam\n> originating from bogus GMail accounts, I have found it necessary to block\n> certain GMail traffic. Please phone me if you believe your message was not\n> received.\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\n> program!\n>>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n\n-- \nJoe Leikhim\n\nLeikhim and Associates\nCommunications Consultants\nOviedo, Florida\n\nwww.Leikhim.com\n\[email protected]\n\n407-982-0446\n\nNote to GMail Account users. Due to an abnormally high volume of spam originating from bogus GMail accounts, I have found it necessary to block certain GMail traffic. Please phone me if you believe your message was not received.\n\n",
    "attachments": []
}