Two. Bill Coleman
On Tue, Aug 4, 2020, 8:26 PM Russ & Melody via CnC-List < cnc-list@cnc-list.com> wrote: > > What is the number o' magnets supposed you be on the paddle-wheel? If it > is more than one then one is missing, > > Cheers, Russ > > > > At 09:57 AM 8/4/2020, you wrote: > > Content-Type: multipart/alternative; > boundary="------------3255BA44138849C8E1038307" > Content-Language: en-US > > One possible thing is the calibration is way off. > > Joe > > Coquina > On 8/4/2020 12:21 PM, General Gao wrote: > > I wanted to come back to this thread. Did some cleaning on land, had my > daughter rotated the Hall effect sensor, the needle moved, thought it was > all good. We later launched the boat and it turned out that the reading was > off still. It read about half of what it was supposed to be. > > What would this indicate? > > Thanks, > > Bo > > On Sat, May 23, 2020 at 1:32 PM Joe Della Barba via CnC-List < > cnc-list@cnc-list.com> wrote: > > Dielectric grease is made specifically for electrical use. Any auto parts > store has it for about $5. > > Joe > > Coquina > On 5/23/2020 12:54 PM, General Gao via CnC-List wrote: > > that is what I am thinking. Would vaseline work? > > Thank you, > > Bo > > On Mon, May 18, 2020 at 3:49 PM Della Barba, Joe via CnC-List < > cnc-list@cnc-list.com> wrote: > > Put some dielectric grease on the connections ;) > >  > > Joe Della Barba Coquina C&C 35 MK I > > www.dellabarba.com > >  > >  > >  > > From: CnC-List [ mailto:cnc-list-boun...@cnc-list.com > <cnc-list-boun...@cnc-list.com>] On Behalf Of General Gao via CnC-List > Sent: Monday, May 18, 2020 3:41 PM > To: cnc-list@cnc-list.com > Cc: General Gao <general.z....@gmail.com > > Subject: [EXTERNAL] Re: Stus-List speedometer - C&C 35 Mk2 > >  > > Reporting back. followed the guide and verified the transmitter had > resistance of 1787ohms, verified there was VAC output when the paddle was > turning fast (couldn't get to the 5knots as boat is on land). Decided to > sand the connectors, and put it back, tested again, and it worked...the > connectors looked without rust, a bit surprised. > >  > > Thank you everyone for the kind help! > >  > > Stay safe, stay healthy. > >  > > Regards, > >  > > Bo > >  > > On Mon, May 18, 2020 at 11:42 AM General Gao <general.z....@gmail.com > > wrote: > > thank you everyone. I really appreciate the information. I will go check > and report back. > >  > > Stay safe! > >  > > Bo > >  > > On Mon, May 18, 2020 at 8:32 AM Ken Heaton via CnC-List < > cnc-list@cnc-list.com> wrote: > > Yup, that's correct. If there are only two wires coming from the > paddlewheel transducer, it is likely this 'generator' type as a more modern > hall effect transducer will have at least three wires (I think). > >  > > Of course a broke wire or bad connection anywhere between the transducer > and the instrument will cause it all to not work. We would just pull the > transducer and connect it directly to the back of the instrument to see > what happens. > >  > > From the Troubleshooting section (last page) of the pdf I linked: > >  > > TROUBLESHOOTING > >  > > DISPLAY READS ZERO- The problem could be either the transmitter or the > display. Please follow the proceeding steps to determine cause of the > problem- > >  > > A. Measure the two wires of the transmitter with an ohm meter for > resistance value of approximately 2000 ohms (2K ohms). Do not spin the > paddlewheel. > > a. If unit is good, then check paddlewheel for any broken fins or missing > magnets. > > b. If unit is open (infinite resistance) then unit needs replacing. > > B. Measure with an AC voltmeter when the paddlewheel is spinning. You > should get approximately 1.0 VAC at about 5 knots of speed when unloaded > (not hooked up to display). > > INTERMITTENT READINGS- Keep the unit wired as normal and add an AC > voltmeter to where the input wires of the transmitter are connected. Motor > or sail as usual- > >  > > A. If an AC voltage is being produced but no speed indication appears on > display, then the problem is in the display. > > B. If readings only occur when voltages are produced, then the paddlewheel > is not always turning. Clean paddlewheel first and be sure it spins freely, > and then try again. If the results are the same then paddlewheel may need > replacing.  > >  > >  > >  > > On Mon, 18 May 2020 at 09:18, Josh Muckley via CnC-List < > cnc-list@cnc-list.com> wrote: > > So if I understand it correctly, the theory of operation for these > generator style knot meters would simply be a 2 wire system and a voltage > developed between the two? I would expect that a simple initial test > would be for continuity between the two wires with the wheel stopped. > Then spin the wheel and check for voltage proportional to the speed of the > wheel. > >  > > Josh Muckley > > S/V Sea Hawk > > 1989 C&C 37+ > > Solomons, MD > >  > >  > > On Mon, May 18, 2020, 07:38 Joe Della Barba via CnC-List < > cnc-list@cnc-list.com> wrote: > > There are (were) some generator knotmeters. Coquina came with one when > we bought her. If memory serves, it topped out at 10 or 12 knots and it > was always fun to peg it :) > > Joe > > Coquina > > On 5/18/2020 5:32 AM, Ken Heaton via CnC-List wrote: > > Have you looked at this web page? This takes yo to the manuals for SR > > Mariner Instruments (since 1973): > > https://srinstruments.com/manuals#mariner_manuals > <https://protect2.fireeye.com/v1/url?k=8594dd2f-d8e74e4e-8594f458-ac1f6b44e86e-dd5873740a9ca4d3&q=1&e=efdd7465-d92c-4c80-83ec-908c6edcb26a&u=https%3A%2F%2Fsrinstruments.com%2Fmanuals%23mariner_manuals> > > > > The only SR Mariner Knotmeter I ever worked on (on a friend's C&C 35 > > Mk.I 1973) was self powered. In other words, no external power was > > needed (except for the backlight for the instrument face for night > > use), the paddle-wheel seemed to be a generator. > > > > More info here: https://srinstruments.com/r/manuals/public/MANSELF.pdf > <https://protect2.fireeye.com/v1/url?k=02beb11d-5fcd227c-02be986a-ac1f6b44e86e-410501274e5fda22&q=1&e=efdd7465-d92c-4c80-83ec-908c6edcb26a&u=https%3A%2F%2Fsrinstruments.com%2Fr%2Fmanuals%2Fpublic%2FMANSELF.pdf> > > > > Ken H. > > > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution --  https://www.paypal.me/stumurray > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution --  https://www.paypal.me/stumurray > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution --  https://www.paypal.me/stumurray > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution --  https://www.paypal.me/stumurray > > > > _______________________________________________ > > Thanks everyone for supporting this list with your > contributions. Each and every one is greatly appreciated. If > you want to support the list - use PayPal to send contribution > -- > https://www.paypal.me/stumurray > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution --  https://www.paypal.me/stumurray > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > >
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