Towertalk
[Top] [All Lists]

[TowerTalk] anchor points

 To: [TowerTalk] anchor points mainhart@juno.com (Rick Mainhart) Wed, 2 Jul 1997 20:49:43 -0400
 ```aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaagh That's the LAST time I try to do any thinking after working overtime fixing someone else's air conditioning. 73, Slightly embarrassed, Rick, WB3EXR On Mon, 30 Jun 97 17:52:20 -0400 Bill Coleman AA4LR writes: >On 6/29/97 9:28 PM, Rick Mainhart at mainhart@juno.com wrote: > >> >>Ah ... a cubic yard is 3 x 3 x 3 or 27 cubic feet. >>27*.67= 18.09 cubic feet required (using your figure) >>18.09/3.14=5.76 feet depth required for 1 foot diameter; >>18.09/6.28=2.88 feet depth required for 2 foot diameter. > >Hmm. My back of the envelope computation says something isn't right. >If >you double the diameter, that quadruples the volume per foot of >height. >If 5.76 feet is right for a 1 foot hole, then a two foot hole should >require 1/4 of that, or roughly 1.5 feet, less about an inch or so. > >The volume should be 2*pi*h*r**2. For a 1 foot diameter hole, that's >pi/2 >cubic feet per foot of height, or around 1.6 cubic feet per foot. Such >a >hole would have to be over 11 feet deep to be 18 cubic feet. > >For the 2 foot diameter hole, your computation is correct, as each >foot >of height yeilds 2pi cubic feet. > >>Not sure whether I'd try to second guess the engineering. > >Certainly not with math like that. > >Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@radio.org >Quote: "Not in a thousand years will man ever fly!" > -- Wilbur Wright, 1901 > > >-- >FAQ on WWW: http://www.contesting.com/towertalkfaq.html >Submissions: towertalk@contesting.com >Administrative requests: towertalk-REQUEST@contesting.com >Problems: owner-towertalk@contesting.com >Search: >http://www.contesting.com/km9p/search.htm > -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: owner-towertalk@contesting.com Search: http://www.contesting.com/km9p/search.htm ```
 Current Thread [TowerTalk] anchor points, Rick Mainhart <= [TowerTalk] anchor points, Stan Griffiths