[Top] [All Lists]

[Towertalk] Tubular Telescopic Masts

To: <>
Subject: [Towertalk] Tubular Telescopic Masts
From: (Mike Newman)
Date: Sat, 14 Sep 2002 16:11:44 +1200
On Wed, 11 Sep 2002  Dino Darling wrote:
> Send a message to Chip @  He has 2 on his side yard.  If I
> remember correctly, there is a small piece of channel, welded to the
> of the inside tube that is "keyed" to a slot in a cap that is welded to
> top of the outside tube.
> These masts are NOT water pipe!  They are very thin!  It amazes me that
> they even work!  These engineers are really smart to get thin metal to
> the way they do!
It's the welding of the channel rib onto the water-pipe that bothers me -I'm
sure that the pipe will curl from the welding induced stresses.  Also
welding will damage the galvanizing on the water-pipe, and it will cost an
arm and a leg to re-galvanize the tube after welding.

Water-pipe is thin - 4" medium galv pipe here has a wall thickness of only
0.178 ".

I've received some photographs that show a rib screwed to inner extension
tube, so those tubes must be thicker than normal waterpipe, otherwise there
wouldn't be sufficient thread length.

I'll get in touch with Chip.

Mike     ZL1BNB

<Prev in Thread] Current Thread [Next in Thread>