[TowerTalk] HDBX Version History...

[Kelly Taylor]

The Rohn BX towers accomplished tapering by having definite swaging near the top of each section, while Delhi towers had a continuous taper from top to bottom for most 48, 56 and 64-foot versions. The shape of the channels forming the legs are similar. 

73, kelly, ve4xt 

Sent from my iPhone

> On Jul 1, 2019, at 21:02, Kim Elmore <cw_de_n5op at sbcglobal.net> wrote:
> 
> Maybe... He said it was an HDBX48, though. Have these things bee cranked out by different companies since the beginning? I always assumed that in the beginning, they were exclusively Rohn. Of course, I dunno when the “beginning” was, so maybe by 1968 they were made by everybody...
> 
> Kim N5OP
> 
> "People that make music together cannot be enemies, at least as long as the music lasts." -- Paul Hindemith
> 
>> On Jul 1, 2019, at 6:44 PM, Don Moman VE6JY <ve6jy.1 at gmail.com> wrote:
>> 
>> The Canadian version by Delhi (now Wade) is similar but has the 5 X
>> braces.  Perhaps he has one of those...
>> 
>>> On Mon, Jul 1, 2019 at 10:47 PM Kim Elmore <cw_de_n5op at sbcglobal.net> wrote:
>>> 
>>> I recently asked a question about HDBX 48 torque loading. Another
>>> towertalkian told me his failed in about 80 MPH winds. He sent me a
>>> picture of his failed HDBX 48 (more heavily loaded than mine by a fair
>>> bit) that failed. Something I noticed in the picture was that his
>>> HDBX48?? had only *five* X-braces per section; I thought it looked odd,
>>> so I went out and looked at mine: mine has *six* X-braces per section.
>>> He said his was manufactured sometime around 1968-1970 while mine was
>>> put up around 1986, so was probably made around that time.
>>> 
>>> Did Rohn change the design of their BX towers to add another X-brace to
>>> each section, or am I seeing things?
>>> 
>>> Kim N5OP
>>> 
>>> --
>>> 
>>> Kim Elmore, Ph.D. (Adj. Assoc. Prof., OU School of Meteorology, CCM, PP
>>> SEL/MEL/Glider, N5OP, 2nd Class Radiotelegraph, GROL)
>>> 
>>> /"In theory there is no difference between theory and practice. But, in
>>> practice, there is." //??? Attributed to many people; it???s so true that
>>> it
>>> doesn???t matter who said it./
>>> 
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