We used the 1990s version of that.

Joe Della Barba

From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Frederick G 
Street
Sent: Tuesday, March 26, 2013 11:21 AM
To: cnc-list@cnc-list.com
Subject: Re: Stus-List Autopilots

I'd definitely use this drive with a Raymarine corepack:

http://www.savinglots.com/lotprod.asp?item=OCTAF1212LAM12

Cheaper than the Raymarine linear drive, too.


Fred Street -- Minneapolis
S/V Oceanis (1979 C&C Landfall 38) -- on the hard in Bayfield, WI   :^(

On Mar 26, 2013, at 10:07 AM, "Della Barba, Joe" 
<joe.della.ba...@ssa.gov<mailto:joe.della.ba...@ssa.gov>> wrote:


We loved the hydraulic units because a hydraulic ram is nearly indestructible. 
The only thing that can really go wrong is a bad seal and that can be fixed 
anywhere in the world. A bad pump can be swapped out fairly easily in a remote 
spot. When the rudder was not supposed to be moving the hydraulics lock it in 
place with much less strain on the device than the mechanical drives. The 
linear drives are more fiddly, with gears and bearings. They would tend to get 
chewed up under heavy use and are not easily fixable in Samoa or Bermuda - they 
pretty much have to go back home for repairs. Remember this is me spending 
other people's money ;) Now if you already have a linear drive it isn't like it 
won't work - they will steer the boat. In your install make SURE there is no 
lost motion with the mount flexing. That will feed back through the rudder 
sensor and the thing will endlessly be going back and forth. We had boats where 
the HULL flexed enough to cause this issue and we had to get reinforcements 
glassed in.

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