Dory Kick-Up Rudder

[Clinton B Chase]

I'm looking at Iain's John Dory construction plan trying to figure out his kick up rudder. My scanner won't scan the drawing, so I hope those with the plans or who can picture then can help me understand how he works the downhaul.

It is clear to me that it comes 'round a cheek block at the top of the rudder head but then I am not sure what it does. At the bottom of the rudder box close to the waterline he shows it go around another block and then tie to a pin in the centerboard inside the box. But as drawn that part of the box looks solid, not hollow. So is the lower bock inside the box or outside or what?? I'll try to get this thing to scan.

TX,
Clint

[Hwyl]

In standard UK dinghy construction, which Iain seems to use a lot of. The top of the swivelling rudder blade is a quadrant, sometimes with a groove and the shockcord goes into that, then around a turning block in the head of the rdder stock, then to the tiller

[James McMullen]

Clint, here's a picture of my disassembled rudder that shows what I did. The top, rounded end of the rudder blade is grooved like a sheave, and the smaller sheave inset into the rudder housing is actually two independent sheaves on the same pin. One part of the rope goes around one way for the uphaul, and the other one goes around the other way to haul the blade down. The control rope is then led up through the top of the rudder stock through that carved race inside there, and thence to a clamcleat to hold the position. This may be more complicated to build than you want, but it is neat and tidy, with no free bits of rope to trail through the water or get tangled on something. I will say I haven't had any problems with it yet for three years running so far. Did I describe that well enough? Hope so, and hope it might help.

http://inlinethumb14.webshots.com/45709/2095460830088484686S600x600Q85.jpg (http://home-and-garden.webshots.com/photo/2095460830088484686gvwMMX)