The speed transducer is caput...
On Tue, Jan 14, 2014 at 8:22 AM, Rick Brass <rickbr...@earthlink.net> wrote: > First post snagged because it was too big. Forgot to delete the string of > previous posts. > > > > *From:* Rick Brass [mailto:rickbr...@earthlink.net] > *Sent:* Tuesday, January 14, 2014 8:17 AM > *To:* 'cnc-list@cnc-list.com' > *Subject:* RE: Stus-List Autohelm St4000 how it should work with the GPS > > > > Curtis; > > > > The elevator version of how the paddlewheel works is that a little magnet > causes pulses in the wire, and the instrument converts the frequency of the > pulses into speed through the water. I’m not sure that a ohm meter would > show me anything even if I knew which pair of pins to test across. > > > > As far as water temp goes, there is a thermister in the sensor that > changes resistance in response to temperature change, but it would probably > only show a very few ohms of resistance and might look like normal > continuity unless you have a very sensitive meter. > > > > If your wind instrument is not hooked up to a GPS to get Speed Over Ground > and heading information, then it uses the speed input from the speed log > and the apparent wind information from the masthead sensor to calculate the > true wind and the VMG information. There is an inherent error here in that > SOG and speed through the water are different due to the impacts of > current, but without boat speed information, it isn’t possible to know true > wind unless you are standing still. > > > > Rick Brass > > > > *From:* CnC-List > [mailto:cnc-list-boun...@cnc-list.com<cnc-list-boun...@cnc-list.com>] > *On Behalf Of *Curtis > *Sent:* Tuesday, January 14, 2014 7:31 AM > *To:* cnc-list@cnc-list.com > *Subject:* Re: Stus-List Autohelm St4000 how it should work with the GPS > > > > I worked with the paddle wheel last night ad was able to clean it. It now > spins freely but shows however it still has no activity on the ohms meter. > All that being said, how much does this speed help you anyway? I mean it > will tell me how fast the river is passing under my boat but not if I’m > making speed? The GPS tells me distance over the ground, I have been > sailing real good before and not making much distance over the ground. What > are your thoughts on this? I will hook it back up and try it tonight after > work. But if there is no activity on the meter It may have a bad wire or > something. > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com > > -- *At sea, I learned how little a person needs, not how much.- Robin Lee Graham*
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