On 12/11/2013 12:49, James HS wrote:
> I have had a design in my head for a while to introduce a coupling to the steering element to magnify the rotation - only a small foot rotation for a large cable movement ...... might try and sketch it out and try it out.
>
That may work, but then you have to deal with the problem that every
tiny twitch of the foot moves the rudder rather more than you need.
> There always seems to be a huge amount of friction in the boats I steer - tight cables and tight bends in bowden cables, and fairly high friction steering end.
>
Too much friction produces the effect of a dead band in your steering -
at first no result, then a bit more and too much result. How about
lubricating or replacing your Bowden cables? It's a very small cost for
a big improvement.
We were the first to introduce Bowden cable steering to this sport, (it
removes the need for re-adjusting the wires when moving stretcher
position). But we are often appalled to see how little maintenance is
then given. Recently one of our pairs came here for some TLC and found
they'd chucked away the cable sheaths and left frayed, bare wires sawing
away into the cable sockets. Doh!
> PLUS the inefficiency of the non CD fin :) (I am learning)
>
Good man! The future is AeRowFin foils - the only sane way to control
shell steering. See also:
www.carldouglas.co.uk/downloads/HyperSteer3.gif
> If you can't change your fin to an aerofoil then I may try to come up with a footplate design - I will 3D print one first and then see where I get to :)
>
We'd all very much like to see what you have in mind. What will you use
to print your design, & in which material?
> As I also find that there is more room steering one way than the other, and that rowing with the instep facing inwards is harder than with it facing outwards - which means I am not putting as much effort into moving the boat!
>
> James
>
Ever since WB Woodgate got his cox to jump ship at Henley RR, we have
been working with klunky foot-steering systems which are never better
than rather poor. I believe we can do better &, unless James gets there
first, a better system we shall devise.
Cheers -
Carl
--
Carl Douglas Racing Shells -
Fine Small-Boats/AeRoWing Low-drag Riggers/Advanced Accessories