That's great, atoll. You are really going to enjoy that system. Best of luck with the install! I'll look forward to following progress as you post it.
A few words of caution on steering cables
and Vectran have been used successfully on a number of boats. Some hsve even gone as far as to remove the chain and use a drumroll steerer (the Swan 45 comes to mind as an example, if I am not mistaken). However, these synthetic cables require constant inspection
(and frequent tuning). So, if you are not racing
or do not want to add another item to your daily checklist, I would suggest going with 7x19 stainless wire rope
The issue is stretch. The splices and line itself (in the case of Dyneema
or Vectran) will have an initial set the first time you really load them up. This is also true for 7x19 stainless wire rope
- referred to here as structural stretch. As a side note, the aerospace industry does offer pre-stretched cables. Come to think of it, all of Edson's new wire assemblies are now pre-stretched too (recent change). So, this initial stretch does need to be tuned out of the steering
after it is loaded up.
For stainless wire rope, there isn't much tuning to do beyond that. Certainly check it though at the beginning of each season, before any big trips, etc. Dyneema and Vectran, on the other hand will continue to stretch (ie: creep). So, especially on a long cable run like yours, you will need to re-tune regularly to keep the proper cable tension. You don't want the unloaded cable falling off a sheave, if it gets to be too slack. I can't say that I have tried Dux (used in standing rigging
applications, mostly), but this may end up to be a compromise between the two... I'd recomend some more research
on that though.
, keep life on the water
simple by going with stainless wire rope, unless you really want to shed a few pounds for racing
(and there's probsbly easier ways to lose that weight).
Also, a quick word on sheaves/blocks in steering systems... You want them to be fixed (ie: no articulation or swiveling once they are lined up). Since only one steering cable is loaded up at a time, the other loosens up a bit, and you run the risk of jamming or fouling up the lazy wire if the blocks can droop or twist a bit. This is a requirement for boat builders according to American standards. So, just be careful which blocks/sheaves you use.