Re: [PSUBS-MAILIST] Rudder angle indicators

[MerlinSub@t-online.de]

No Vance, no go!

Todays solution:

On the rudder axis a potentiometer - from there via a cable to a electric servo motor to a mechanical coke cable to the other side of the submarine. The mechanical cable goes into a black with another potentiometer. This box change the analog signal to digital and send it via an CAN bus to the ships computer (on the other sie of the boat of course). The computer has an graphic display (you can change the dispaly in size and format of course) and the rudder angle indication will be stored also on a hard disk 10times each milisecond for 24 hours a day. It is clear that the black box runs on 12 Volt, the electric servo motor on 24 volt and the computer on 220Volt 50Hz. And the subs battery has 48 Volt. So some DC-DC and DC-AC Converter are also required to make the system running. 

We have 2010 not 1977.. 

;-) Carsten 


<vbra676539@aol.com> schrieb:
> 
> Frank,
> A mechanical alternative is the Pisces unit, a SS cable (like a choke cable on a bike). You attach it to the pivot lever on your thrusters, then make a little delrin and SS arrow indicator on the other end and bracket mount it in front of a viewport (outside). No electrics, no penetrator, nothing to fail.
> Vance
> 
> 
> 
> 
> 
> 
> -----Original Message-----
> From: ShellyDalg@aol.com
> To: personal_submersibles@psubs.org
> Sent: Mon, Mar 8, 2010 12:50 pm
> Subject: Re: [PSUBS-MAILIST] Rudder angle indicators
> 
> 
> For a sensor to detect rudder angles or dive plane angles, Minnkota and Lenco have the setup built into the trim tab actuators/switches. The system is a little pricey though. The Minnkota actuators with a 4 inch stroke are $259 for the actuator alone, and another $80 for the switch with LED graph.
> As an alternative, it should be possible to use the idea suggested by Alan. He mentioned a magnet coupled to a simple "string" of magnetic switches, wired to an LED display inside the sub.
> In my application, it could be set up on the linkage controlling the dive planes or rudders. The number of wires would be determined by how many magnetic switches are used. I'm thinking 5 would suffice. One for center and two on each end for half way and full stroke. The whole thing could be potted in epoxy making it waterproof. Replacement of any individual part would be fairly inexpensive. The magnetic switch "strings" could be fabricated and kept as a "spares", the magnet attached to the linkage with a screw, and a small epoxied thru-hull. The internal display is the same, Low tech and cheap to build, easy to replace. Keeping it simple is the key to low cost and reliability. I bet you could even find the magnetic switch "strings" and internal LED graph parts as off-the-shelf items. You'd have to seal them up ( potting  in epoxy ) your self and make a mount specific to your application, but replacing a blown part would be easy. 
> Frank D.
> 
> 




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