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## [TowerTalk] Ginpole for 20 foot sections

 To: [TowerTalk] Ginpole for 20 foot sections n4kg@juno.com (n4kg@juno.com) Wed, 13 Jun 2001 10:26:03 -0600
 ```The pulley at the top of a gin pole merely changes the direction of the rope. Please explain how a block and tackle "Magically" reduces the force on the rope to the top pulley and how to install the block and tackle to achieve this magical reduction. One more point. One pulley can give a 2:1 mechanical advantage if one end of the rope is attached to a FIXED support. If both ends of the rope are moving, there is NO mechanical advantage, only a direction change plus loss due to friction. de Tom N4KG On 13 Jun 2001 Mike Gilmer - N2MG writes: > Steve, you are "half" right. > > The lift effort is part of the overall load on the > ginpole (everyone forgets this), so without any > mechanical advantage there is 2X load weight applied > to the ginpole. If you employ a 3:1 advantage, and > thereby reduce the lift force needed, you decrease the > overall force on the ginpole. > > 73 Mike N2MG > > On Wed, 13 June 2001, K7LXC@aol.com wrote: > > > In a message dated 6/12/01 11:45:50 PM Pacific Daylight Time, > > w7ni@easystreet.com writes: > > > > > A 3:1 mechanical advantage block and tackle system does, > indeed, relieve > > > about 1/3 of the load on the gin pole, in addition to reducing > the number > > of > > > bodies required on the pull rope. > > > > You sure? Isn't a hundred-pound load going to weigh 100 pounds > no matter > > how the block and tackle are set up? The load effort on the end of > the rope > > will be reduced but the dead weight of the load stays the same. > You still > > need a suitable ginpole. > > > > Cheers, Steve K7LXC > > Tower Tech > > ________________________________________________ > PeoplePC: It's for people. And it's just smart. > http://www.peoplepc.com > > List Sponsor: Are you thinking about installing a tower this summer? > Call us > for information on our fabulous Trylon Titan self-supporting towers > - up to > 96-feet for less than \$2000! at 888-833-3104 HREF="http://www.ChampionRadio.com";> > www.ChampionRadio.com > > ----- > FAQ on WWW: http://www.contesting.com/FAQ/towertalk > Submissions: towertalk@contesting.com > Administrative requests: towertalk-REQUEST@contesting.com > Problems: owner-towertalk@contesting.com > ________________________________________________________________ GET INTERNET ACCESS FROM JUNO! Juno offers FREE or PREMIUM Internet access for less! Join Juno today! For your FREE software, visit: http://dl.www.juno.com/get/tagj. List Sponsor: Are you thinking about installing a tower this summer? Call us for information on our fabulous Trylon Titan self-supporting towers - up to 96-feet for less than \$2000! at 888-833-3104 www.ChampionRadio.com ----- FAQ on WWW: http://www.contesting.com/FAQ/towertalk Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: owner-towertalk@contesting.com ```
 Current Thread [TowerTalk] Ginpole for 20 foot sections, (continued) [TowerTalk] Ginpole for 20 foot sections, Stan or Patricia Griffiths [TowerTalk] Ginpole for 20 foot sections, Jim [TowerTalk] Ginpole for 20 foot sections, Mike Gilmer - N2MG [TowerTalk] Ginpole for 20 foot sections, Earl Bailley [TowerTalk] Ginpole for 20 foot sections, Kim Bottles [TowerTalk] Ginpole for 20 foot sections, Guy Olinger, K2AV [TowerTalk] Ginpole for 20 foot sections, Mike Gilmer - N2MG [TowerTalk] Ginpole for 20 foot sections, Ward Silver [TowerTalk] Ginpole for 20 foot sections, Bob Nielsen [TowerTalk] Ginpole for 20 foot sections, Guy Olinger, K2AV [TowerTalk] Ginpole for 20 foot sections, n4kg@juno.com <= [TowerTalk] Ginpole for 20 foot sections, David Robbins [TowerTalk] Ginpole for 20 foot sections, Gary McDuffie, Sr. [TowerTalk] Ginpole for 20 foot sections, Stan or Patricia Griffiths [TowerTalk] Ginpole for 20 foot sections, n4kg@juno.com [TowerTalk] Ginpole for 20 foot sections, Stan or Patricia Griffiths [TowerTalk] Ginpole for 20 foot sections, Guy Olinger, K2AV [TowerTalk] Ginpole for 20 foot sections, David Robbins [TowerTalk] Ginpole for 20 foot sections, Mel Farrer [TowerTalk] Ginpole for 20 foot sections, Mike Gilmer - N2MG [TowerTalk] Ginpole for 20 foot sections, Guy Olinger, K2AV