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Jeffa Autopilot Failure

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fulanito View Drop Down
Sub Lieutenant
Sub Lieutenant


Joined: 29 April 2018
Location: Auckland
Status: Offline
Points: 13
Post Options Post Options   Thanks (0) Thanks(0)   Quote fulanito Quote  Post ReplyReply Direct Link To This Post Posted: 28 December 2021 at 04:28
JD
Don't forget that there are only 2 or 3 gear teeth doing the work in the planetary. So mechanical fatigue will aways be a problem.
Once the tooth is broken it will look up the  rudder until the arm is removed. 
Even reduced loads will cause metal fatigue on the same spot. Your DD1 will not be steering from 0 to 25. It will 0 to 5 in a balanced boat. So I personally think that you want gain anything by reducing tbe loads. It is a design issue, that to me is limiting the DD1 unit to be used with 505 rudder.
To me, in my opinion if you need peace of mind, get rid of it.
I live in NZ and the southern Pacific have demonstrated me that DD1 is a toy AP.  Ending up in a  broaching position due to AP been locked up with a broken tooth stack in the planetary loosing your steering is certainly a very dangerous condition. This applies to all electro mechanical systems.
All other boats I had and also crewed in Oceania have hydraulic rams.
Cheers 
GG
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kipwrite View Drop Down
Captain
Captain


Joined: 14 October 2015
Location: New York
Status: Offline
Points: 293
Post Options Post Options   Thanks (0) Thanks(0)   Quote kipwrite Quote  Post ReplyReply Direct Link To This Post Posted: 28 December 2021 at 19:25
Fulanito,
You may well be right about the DD1. Needs gentle handling. 
Two questions on your proposed hydraulic unit. 
1- looks like that unit is not recommended in a spot that gets wet. If you're installing in the same spot as the DD1, how will you keep things dry?
2- also curious where are you planning to place the fluid reservoir?
Once you have this installed in February, please post photos and let us know how it performs. 
I'd much rather have a hydraulic unit - if there's one that can work. 
Kipwrite
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