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{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/EUXSSQ755KKHXORCCLXZZJGMUC7GC6OC/", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/", "message_id": "[email protected]", "message_id_hash": "EUXSSQ755KKHXORCCLXZZJGMUC7GC6OC", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/EDB462KYHER4QCNQ3MP3HNWYAQE3R6UC/", "sender": { "address": "donmc (a) xtra.co.nz", "mailman_id": "5b2f7fdb0ad948baa424ce6b0c94b130", "emails": "https://mailman.amsat.org/hyperkitty/api/sender/5b2f7fdb0ad948baa424ce6b0c94b130/emails/" }, "sender_name": "don", "subject": "[amsat-bb] Re: Could we raise orbit thru magnetorque?", "date": "2007-02-21T20:57:41Z", "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/EDB462KYHER4QCNQ3MP3HNWYAQE3R6UC/", "children": [], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "Bob et al,\n Agreed that the forces are tiny, but what about the \n\"differential\" forces that apply when one magnetic system is between two \nother magnetic systems.\n Still tiny, but larger than either by themselves. Possibily \ninsufficient to supply the delta v required to make useful changes to \nthe orbit, and as Greg pointed out very difficult to do. The \ndifferential effect was the point of my original post, probably not well \nexpressed though.\n When this interesting topic first arose I dismissed it out of hand, \nbut it kept coming back, and required further pondering hence the \noriginal post. I have tried to find out more about the \"tether\" project \nbut there doesn't seem to be a lot of info available. Maybe someone can \npoint me in the right direction.(no pun intended!)\n If any one doubts the forces available using magnetic fields, It could \nbe instructive to watch the cables from a high power arc welding set \nwhen the arc is struck..... I've seen them literally jump several inches!\n\n On a totally different subject is there any \"promotional\" material \nsomewhere on the net suitable for a simple club presentation about APRS?\n\nThanks to everyone for the interesting comments.\n\nDon McNeil ZL1THO\n", "attachments": [] }