🚀 go-pugleaf

On Sat, 04 Jul 2009 23:37:54 +0100, Phil W Lee
<phil(at)lee-family(dot)me(dot)uk> wrote:

>"Brian Watson" <Brian@imagebus.co.uk> considered Sat, 4 Jul 2009
>15:36:12 +0100 the perfect time to write:
>
>>Charles Ellson wrote:
>>> On Thu, 2 Jul 2009 07:41:50 +0100, "Brian Watson"
>>> <Brian@imagebus.co.uk> wrote:
>>>
>>>> Charles Ellson wrote:
>>>>
>>>>> They can only cope with a particular temperature range. If the
>>>>> temperature becomes very hot or very cold and the OHLE section is
>>>>> very long then it is possible for the weights to be pulled all the
>>>>> way up (twang!) in very cold weather or to rest on the bottom of
>>>>> the rack and de-tension the wire in very hot weather.
>>>>
>>>> So a simple solution is to move the bump stop down so the weights
>>>> can drop lower.
>>>>
>>> That would often involve removing some metalwork and digging a hole.
>>
>>Beyond their ability, then.
>>
>>:-\
>>
>>> A
>>> simpler method would be to have a link (painted a bright colour to
>>> make it visible in winter) somewhere in the last bit of cable attached
>>> to the pulley which could be removed in the summer.
>>
>>Bearing in mind the interruptions to service each time such links needed to 
>>be moved, I fail to see how that is simpler.
>
>If you use a pair of blocks on the insulated side, you can wind them
>in or out without interupting service at all.
>
I would have thought it unlikely that there would not be some period
when the line would be closed anyway for various other periodic tasks.

>>
>>>> For lack of that, the trains are disrupted.
>>>>
>>> In most places the measure is not necessary. In other places the
>>> problem occurs so seldom that less disruption would be caused by
>>> imposing a temporary speed limit.
>>
>>As it is likely to be more frequent in future, It'd seem pretty smart to 
>>modify the system now.
>
>Using larger diameter weights would mean a shorter stack of them,
>meaning the existing system would have more range.
>
For those type of weights there might also be some scope for adding a
couple of guides and putting "ears" on the weights (making them
vaguely like the LT symbol) to further reduce the height of the
bundle.