eHam Logo

Community
 Home
 eHam.net Home
 Articles & Stories
 Contesting Wiki
 Speakout
 Strays
 Survey
 My Profile

Resources
 This Week's Contests
 Classified Ads
 Contest Links
 Product Reviews



Contest Lists
 3830
 CQ-Contest
 CT-User
 NA-User
 SD-User
 TRLog
 VHFcontesting
 WriteLog

Other Lists
 Amps
 AntennaWare
 Propagation
 RFI
 RTTY
 TenTec
 TopBand
 TowerTalk
 Yaesu

 Mailing List FAQs


Site Information
 About This Site
 Contesting.com Team

Contesting Online Forums : Tips : Tower Anchors Forums Help

1-3 of 3 messages

  Page 1 of 1  


Tower Anchors Reply
by K5EWJ on September 27, 2006 Mail this to a friend!
I am preparing to install a tower. Anyone have info on how much bending moment that a piece of 3" pipe will take?
 
RE: Tower Anchors Reply
by KB9CRY on October 9, 2006 Mail this to a friend!
Not much. Pipe is designed to carry fluids or gases and is built to withstand pressure equally distributed from within.

Post this same question on the TowerTalk reflector as you'll get better/wiser answers there.

Phil
 
RE: Tower Anchors Reply
by vk2cz on October 15, 2006 Mail this to a friend!
Pipe stiffness is defined as = G*(D squared)... so by doubling the Diameter of the pipe say to 6", the pipe is 4 times stiffer.

Interesting the stiffness of a tube is not much affected by the wall thickness, indeed a solid 3" diameter rod is only 30% stiffer than say a 3" pipe with a quarter inch wall.

Look to a flagpole for some guideance with regard to loading... you may only get to support a small HF yagi about 15' off the ground with a 3" pipe..

I know some steels seriously drop in strength when temperature drop below zero.. but have never had to worry about that here.. have a chat with a local structural engineer.. they can be friendly.. ;-}
David VK2CZ
 

  Page 1 of 1  

 
Next Topic:   CQWW
Previous Topic:   TS-930S vs. TS-830S
Email Subscription
You are not subscribed to this topic.

Subscribe!
My Subscriptions
Subscriptions Help


Search Tips:

Check our help page for help using Forums, or send questions, comments, or suggestions to the Forums Manager.