I have a Tradewind 33, originally designed for tiller steering
, that came with an abortion of a steering wheel
conversion in the middle of the (small) cockpit
using a Whitlock Cobra pedestal
system and with the control rod above
sole This also prevented the use of an emergency
tiller longer than about 18" as it would foul the pedestal
I am in the process of designing a chain/cable system with the wheel
on the aft cockpit bulkhead over the tiller head
and linked to an 8" quadrant on the rudder
shaft. I have sourced a 2" dia. bronze sprocket and matching 1/2" stainless chain and two 5" pulleys. Assuming I line up all the components correctly (the pulleys will be on swiveling hinges but once aligned should not move more than about 1~2 degrees) do I need to use any spring tensioners in the system and would 1/4" (6mm) wire rope
be strong enough or should I use 5/16" (8mm)? I believe the pulleys may
be able to take the larger cable but I'm not sure. I guesstimate I should get 1 1/2 turns lock to lock with the rudder
moving 35 degrees either side of centre and I'm using the 30" wheel from the Whitlock pedestal which also had 1 1/2 turns lock to lock.
Additional information: boat is approximately 8 tonnes and carries 550' sq ft of sail, rudder is approximately 4' sq. ft and and mean chord is about 16" unbalanced and keel
hung and the vessel is a long keel
Would appreciate any additional information/criticism of my proposed idea.
ps I cannot find a proprietary design that would fit, hence the bespoke nature of my design, also it will cost a lot less!