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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/UCLQXHC456MRF2E5ARTJWJM67BFNEOQZ/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "CAK2SEyuvVMB2=G3OYRQnt5C9eNQpmeOhrMGpKLCqA+tBQ0mi7w@mail.gmail.com",
    "message_id_hash": "UCLQXHC456MRF2E5ARTJWJM67BFNEOQZ",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/TH4IJHS2BIHAXTXLFODSXJHEE6H4QG2T/",
    "sender": {
        "address": "goody.k3ng (a) gmail.com",
        "mailman_id": "b2b23a04931e4e3e82ba1d7fb5eb0210",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/b2b23a04931e4e3e82ba1d7fb5eb0210/emails/"
    },
    "sender_name": "Goody K3NG",
    "subject": "Re: [amsat-bb] Cubesat Vibration Test",
    "date": "2014-10-18T01:23:34Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/SZ2C7BY7B72CCBDPTYKXW4IEHWMPCGPE/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "I don't have anything to add to the discussion, I just wanted to say I love\nthreads like this and I'd like to see more.  I'll never be a rocket\nscientist, but reading about all the design considerations, experiences,\ntesting, trials and tribulations, and minutia involved in engineering and\nlaunching these things is cool.\n\n73\nGoody\nK3NG\n\nOn Thu, Oct 16, 2014 at 9:19 AM, Glen Gardner <[email protected]>\nwrote:\n\n>\n> This is why you do the shake tests.\n>\n>\n> Two thoughts come to mind here...\n>\n> building for 25 G vibration and 1000 G shock is pretty much consumer grade\n> stuff and is easily achieved with off the shelf components.\n>\n> The hard part comes in when you realize that riding on a solid rocket\n> motor is brutal, and results in resonances that sweep through a wide range\n> of frequencies during the burn.  The vibration tables generally emulate\n> this really well and weaknesses can be exposed in short order. If the\n> circuit boards exhibit a resonance , components can literally be popped\n> right off of the board... and sometimes weaknesses internal to the die\n> bonding in some components can turn up as well.\n>\n> If I had to rely on conformal coating to stake the parts for 22G, I'd be\n> worried about the payload....\n>\n>\n> Glen\n> AA8C\n>\n>\n>\n>\n> On 10/16/2014 01:01 PM, Harvey N. Vordenbaum wrote:\n>\n>> No conformal coating?\n>> hv\n>>\n>>\n>> -----Original Message-----\n>> From: [email protected] [mailto:[email protected]] On\n>> Behalf Of Robert Bruninga\n>> Sent: Wednesday, October 15, 2014 7:18 PM\n>> To: [email protected]\n>> Subject: [amsat-bb] Cubesat Vibration Test\n>>\n>> To see the violence that a cubesat has to go through, here is a test we\n>> did today on a power supply board.\n>>\n>> http://aprs.org/psat/Vibe-coil-test1724.MOV   (1 meg file)\n>>\n>>\n>>\n>> It failed even before we got to the 22G requirement!\n>>\n>>\n>>\n>> Yes, it is rocket science…  a nasty place to ride…\n>>\n>>\n>>\n>> Bob, WB4aPR\n>> _______________________________________________\n>> Sent via [email protected]. AMSAT-NA makes this open forum available to\n>> all interested persons worldwide without requiring membership. Opinions\n>> expressed are solely those of the author, and do not reflect the official\n>> views of AMSAT-NA.\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]. AMSAT-NA makes this open forum available\n>> to all interested persons worldwide without requiring membership.\n>> Opinions expressed\n>> are solely those of the author, and do not reflect the official views of\n>> AMSAT-NA.\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]. AMSAT-NA makes this open forum available\n> to all interested persons worldwide without requiring membership. Opinions\n> expressed\n> are solely those of the author, and do not reflect the official views of\n> AMSAT-NA.\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",
    "attachments": []
}