>> the problem with locks is that they take too long to fill or empty
>> 20 min is avarage.. Is there a high Speed Lock in operation anywere?
>
> Sandford Lock on the Thames near Oxford. It's big enough to take
> probably 20 narrowboats (at a guess) and I've seen it filled from
> empty
> in under 2 minutes.... You probably wouldn't want to be in it at the
> time though :-)
>
In the video 'Towpath Encounter' about horseboats they reckoned 3
minutes for a lock - but this involved opening the paddles fully as the
boat entered the lock at speed, in order to slow it down. It was fairly
routine in working days to push the gates open - IIRC FNC steamers were
claimed to be able to open the gate against about a foot head of water,
and of course the last few inches are the slowest.
> --
> Andy Greener
Sean
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