Rudder installation

[tim]

When installing a rudder to the transom of an OK, there is a 50mm maximum from the bottom of the transom to the intersection of the 2 front edges of the board. There is no minimum.

Is there an "ideal" measurement for this distance?

I assume that most people go for as close to the maximum as possible (maybe with a small safety factor for measuring error).

Is there any benefit or disadvantage in lifting the rudder (reducing this 50mm max)? This might reduce drag. I assume that this could also lead to problems with effective steering (even causing more drag if the rudder cavitates).

Does anyone have a setup with less than the 50mm, If so, how high can you go and do you feel that it makes difference.

Tim

[aus729]

Hi Tim.

I used to place the rudder as deep as possible, 50mm.
Now I don't, I think mine is almost at 0mm now, will check on the weekend if you want. The rudders from Jason have a nice curved section so you get less flat surface on the front of the foil above the water line, less drag when going downwind.

Have not noticed any difference.

Less drag?
More rudder?
Larger/heavier rudder?

The list goes on.

[tim]

Thanks Andre,

I guess if your steering technique is good you can probably get away with less rudder in the water (for a small reduction in drag).

I will try 0mm on my new rudder.