Autohelm 4000 on 37C
I have had an Autohelm 4000 (predecesor to the ST 4000 and ST 4000+) on my H37C for over 10 years, now, and it is still serving well. The publized weight for my boat is 18,000 lbs. Actual weight is probably more. More than the weight, my problem is that while cruising under power, the wheel pulls real hard to port. This torque caused the posts for the idler wheels inside the steering ring to break after about a year and a half of use. I modified the posts by drilling down the center and installing a stainless bolt down through the center. I did this on all of the good posts as well as the broken post. Haven't had a problem with that ever since. The only other problem I've had is that the plastic clutch handle finally broke after about 10 years of service. That cost me only about $5.00 to replace (The price has gone up to $10.00, now). As far as performance, it will not handle down wind swells - not fast enough to respond to the yawing (Not many autopilots are fast enough). Generally, I have had very good service from this autopilot, but if I ever have to replace it, I will probably go to the ST5000. I would like to know how much faster the ST5000 is over the ST4000.