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<div class=Section1>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I remember watching a very substantial H frame unit with bells
weighing 42 ½ cwt & 30 odd cwt either side shimmyimg nicely when they were
both rung!<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>George<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
bellhistorians@yahoogroups.com [mailto:bellhistorians@yahoogroups.com] <b>On
Behalf Of </b>Bickerton, Roderic (SELEX GALILEO, UK)<br>
<b>Sent:</b> 24 March 2010 11:42<br>
<b>To:</b> bellhistorians@yahoogroups.com<br>
<b>Subject:</b> RE: [Bell Historians] Conservation gone wrong (was Whitechapel
charges)<o:p></o:p></span></p>
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<p style='margin-bottom:12.0pt'>Take up more space, how so?<br>
They are not as wide as the necessary pit length, and not being deeply<br>
ribbed allow very close spacing. They are the same height as equivalent<br>
H sections.<br>
Flexing is only a problem if they are subject to to much load.<br>
That only gives rise to bad go in the form of suck and blow if one A<br>
supports bearings from 2 bells, allowing interaction.<br>
<br>
The worst flex I can remember seeing was the top frame at St Mary le<br>
Towers, in the early 1980's. That's a low side.<br>
I was not aware of any effect on go, but as I was measuring striking<br>
accuracy, I was only ringing one bell at a time.<br>
(As an aside they were so good as to need no adjustment, although it did<br>
reveal the front bells to be very fast turning).<br>
<br>
I have been up with a couple of 1/2 ton 6's on early A's and could not<br>
see flexing.<br>
<br>
Ribs don't stop flexing, they just reduce it at the expense of a wider<br>
overall section.<br>
They improve the strength to mass ratio.<br>
In fact a solid section the same width as the ribbed section would be<br>
much more rigid.<br>
It would also be seriously expensive and extremely heavy.<br>
<br>
"The castings in those A frames aren't very good - they have no ribs on<br>
them so can flex too easily. Also take up a lot more space than H<br>
castings.<br>
<br>
David "<br>
<br>
SELEX Galileo Ltd<br>
Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14
3EL<br>
A company registered in England & Wales. Company no. 02426132<br>
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<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>No virus
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