[TowerTalk] FW: Need a mast for my tower

[km5vi]

Steve - I should have better defined toughness as the amount of additional
strain a material can tolerate before it reaches ultimate strength.  The
later is often, but not always associated with the difference between a
material's yield and ultimate strengths.

Gary - Good to hear from you - I'll follow up off the reflector.

73

Matt
KM5VI

-----Original Message-----
From: Gary K9GS [mailto:garyk9gs at wi.rr.com] 
Sent: Wednesday, July 06, 2011 11:52 PM
To: km5vi at flukey.cc
Subject: Re: [TowerTalk] Need a mast for my tower

Hi Matt!

Saw your post.  How are you doing???



On 7/6/2011 10:54 PM, km5vi wrote:
> Be careful in considering aluminum as a mast material.  Whereas some
> aluminum alloys offer an attractive yield strength, many do not exhibit an
> ultimate strength with much margin over yield (a.k.a. toughness) as
compared
> to carbon steel.  The results can be catastrophic - the mast breaks
> relatively soon after reaching the point of bending when subjected to
> excessive strain.  This is not necessarily a problem if the proper factors
> of safety are maintained, but is something to be aware of.
>
> 73 es GL
>
> Matt
> KM5VI
>
>
> -----Original Message-----
> From: towertalk-bounces at contesting.com
> [mailto:towertalk-bounces at contesting.com] On Behalf Of K8RI on TT
> Sent: Wednesday, July 06, 2011 9:14 PM
> To: towertalk at contesting.com
> Subject: Re: [TowerTalk] Need a mast for my tower
>
> On 7/6/2011 6:10 PM, STEVE LANE wrote:
>> Looking for a 20'  long 2" diameter heavy wall mast. Going to have a
Force
>> 12 C19XR and a 10 meter ground plane on it. I am near the San Francisco
> Bay
>> area and can pick it up. Thanks
>>
> Check around your area for metal supply shops.  I have two places, one
> within 5 miles and the other about 20. Both will deliver which
> unfortunately is no where near your location.  The one place has
> Aluminum, Steel, and Copper in sheets, rods, and tube. They even carry
> DOM steel.
>
> I'm installing a C19XR with the WARC 7 above it on 2", 1/4" wall,
> 6061-T6 Aluminum tube.  The WARC-7 is fairly light and only about 4 sq
> ft of wind area.
>
> 73  and good luck,
>
> Roger (K8RI)
>
>> Steve
>> K9SL
>> _______________________________________________
>>
>>
>>
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>
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-- 


73,

Gary K9GS

Check out K9NS on the web:  http://www.k9ns.com
Greater Milwaukee DX Association: http://www.gmdxa.org
Society of Midwest Contesters: http://www.w9smc.com

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