[EMAIL PROTECTED] wrote:
> --- In [email protected], Martin <[EMAIL PROTECTED]> wrote:
> >
> > Daniel Hutchinson wrote...
> > >Emilyanne can also push the gate open against 6/8inchs of water,
> > >which as you say, greatly speeds up the slowest last few inches.
> =20
> > No wonder so many lock gates are damaged and leaky and do not fit=20
> > properly.
> > --=20
> > Martin Clark
> I missed that comment earler, but think its a little harsh.
> - For a start, it is my obsevation that the great majority of the=20
> lock gates on the system are in good working order, a few leak a=20
> little, and a a few are in need of a little repair. But generally=20
> there in a very acceptable state.
> - Secondly, there is little damage to be done from gentaly pushing=20
> open a gate against a small head of water. The boat pushes smoothly=20
> and contiuasly against the middle of the gate, and the force exerted=20
> on the gate is nateraly limited to that of the boats thrust=20
> or 'static bollard force'.
It's true that you're unlikely to damage a gate by pushing gently. But I'm
surprised that you can push a gate open against a head as great as 6 to 8
inches. A back-of-fag-packet (except that I don't smoke) calculation suggests
that on a typical narrow lock this would take between a ton and a ton and a
third of force.
A quick look on Google suggests that a typical commercial tug manages about 1
ton push (or pull) for every 80hp of engine power. And that's a modern craft
specifically designed for that purpose.
Are my sums wrong (quite possible - it's a long time since I did A-level maths
amd physics!) or is your boat capable of a surpisingly hard push? (maybe
because of being steam-powered?)
Martin L
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