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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/SZ2C7BY7B72CCBDPTYKXW4IEHWMPCGPE/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "SZ2C7BY7B72CCBDPTYKXW4IEHWMPCGPE",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/TH4IJHS2BIHAXTXLFODSXJHEE6H4QG2T/?format=api",
    "sender": {
        "address": "glen.gardner (a) verizon.net",
        "mailman_id": "58f7ea49d44e4320bd04e8f6d9c02d17",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/58f7ea49d44e4320bd04e8f6d9c02d17/emails/?format=api"
    },
    "sender_name": "Glen Gardner",
    "subject": "Re: [amsat-bb] Cubesat Vibration Test",
    "date": "2014-10-16T13:19:05Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/A3XVCN3WPL3UZCY3OSVF5WJV3DFHAH4J/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/UCLQXHC456MRF2E5ARTJWJM67BFNEOQZ/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\nThis is why you do the shake tests.\n\n\nTwo thoughts come to mind here...\n\nbuilding for 25 G vibration and 1000 G shock is pretty much consumer \ngrade stuff and is easily achieved with off the shelf components.\n\nThe hard part comes in when you realize that riding on a solid rocket \nmotor is brutal, and results in resonances that sweep through a wide \nrange of frequencies during the burn.  The vibration tables generally \nemulate this really well and weaknesses can be exposed in short order. \nIf the circuit boards exhibit a resonance , components can literally be \npopped right off of the board... and sometimes weaknesses internal to \nthe die bonding in some components can turn up as well.\n\nIf I had to rely on conformal coating to stake the parts for 22G, I'd be \nworried about the payload....\n\n\nGlen\nAA8C\n\n\n\nOn 10/16/2014 01:01 PM, Harvey N. Vordenbaum wrote:\n> No conformal coating?\n> hv\n>\n>\n> -----Original Message-----\n> From: [email protected] [mailto:[email protected]] On 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 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 all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official 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. Opinions expressed\n> are solely those of the author, and do not reflect the official 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",
    "attachments": []
}