There is a third type which is a linear hydraulic unit with integral pump and resevoir. I have one on my Simrad-Robertson AP35. It is powerful and reliable.
http://www.wmjmarine.com/s21113386.html ========================================== On Wed, Jul 23, 2008 at 6:42 PM, Norm of Bandersnatch <[EMAIL PROTECTED]> wrote: > I know of two types of linear drives. > > One that I have I believe was made to aim the large old-style home satellite > TV antennas. It has a 12 VDC motor, screw drive and a travel of > about eight inches. I use it to operate a sliding blade valve (like in a RV > black water drain valve, but bigger and in stainless) as my main engine > exhaust discharge sea valve so I can close it in case of a stranding or > other emergency. It would have to be mechanically disconnected from the > steering quadrant or tiller when not in use. > > The second type I saw on the Internet. It consists of a tube with a series > of toiriod (donut shaped) electromagnets stacked along it and rod sliding > inside the tube with a series of strong permanent magnets. A controller > turns the electromagnets on and off to pull the permanent magnets back and > forth through the tube. I forget the web site and it got wiped from my > bookmarks last time I had to reinstall @#$%$% Windows. > > My boat has Wagner hydraulic manual system with a no-name flea market > Italian hydraulic pump controlled by a Furuno autopilot. > > Norm > S/V Bandersnatch > Lying Julington Creek > 30 07.695N 081 38.484W > > > > ----- Original Message ----- > From: Philip & Marilyn > To: [email protected] > Sent: 7/23/2008 8:42:59 AM > Subject: [Liveaboard] Autohelm pilot > I have an Autohelm 6000 wheel pilot (came with the boat) and definitely do > not like the drag and catch that the disengaged belt causes on the helm. > What investigation I have done tells me that there is no solution to this > problem. > > I am thinking about getting a below deck electric ram - Type 1 Linear Drive > 12 V. I believe it will interface with my existing control head. Money is a > consideration. Does any one have any experience with these? When it is > disengaged, how much drag does it place on the (cable and quadrant) steering > system? > > Thanks, Philip > > > "Be the change you want to see" > Philip & Marilyn Lange > AE4OV & KD4JRC, > ORYOKI > Witness 35 Catamaran > > > _______________________________________________ > Liveaboard mailing list > [email protected] > To adjust your membership settings over the web > http://www.liveaboardnow.org/mailman/listinfo/liveaboard > To subscribe send an email to [EMAIL PROTECTED] > > To unsubscribe send an email to [EMAIL PROTECTED] > The archives are at http://www.liveaboardnow.org/pipermail/liveaboard/ > > To search the archives > http://www.mail-archive.com/[email protected] > > The Mailman Users Guide can be found here > http://www.gnu.org/software/mailman/mailman-member/index.html > _______________________________________________ Liveaboard mailing list [email protected] To adjust your membership settings over the web http://www.liveaboardnow.org/mailman/listinfo/liveaboard To subscribe send an email to [EMAIL PROTECTED] To unsubscribe send an email to [EMAIL PROTECTED] The archives are at http://www.liveaboardnow.org/pipermail/liveaboard/ To search the archives http://www.mail-archive.com/[email protected] The Mailman Users Guide can be found here http://www.gnu.org/software/mailman/mailman-member/index.html
