>>3) The effective area of the rudder could be increased by clamping an
>>auxiliary blade to the existing blade, e.g. as follows:-
>
> That's a VERY good idea!
>
> Brian L Dominic
>
The area of a genuine horseboat (or butty) rudder is big enough for it
to be possible to propel the boat (at a slow but useful pace) by
swinging the rudder to and fro - I moved Maria a couple of hundred yards
this way at Uppermill when we were waiting for the horse. The boat was
initially on the non-towpath side, there were boats moored to the
towpath, and a bridge with no towpath underneath so it would probably
have taken as much time to connect, disconnect and re-connect the horse
two or three times.
Sean
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