Get hold of the chaps at Edson
. They probably supplied the original gear
, and I know Rob will be able to do the neccessary calculations for you.
The thing you've got to look out for is the extra force you will require to turn the wheel
. Open-wire steering is very powerful, but the extra force transmitted to the wheel is offset by the larger wheel a pedestal
allows one to swing: do you have room to swing a 3' diameter wheel in your cockpit
? If you want to look at another option, I'd also look at the CD-i system from Edson- it's a drag-link unit with a bevel-gear system driving a lever under the deck
which pushes on a little tiller on your rudder-shaft. The feel is amazingly direct, and I'd say, without having seen your below-deck arrangement, that it'd be the neatest system for you.