DrewR

Navman/Northstar 3100/310 paddle wheel! Kiwi help?

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So I'm appealing to anyone who might have an old Navman/Northstar 3100/310 speed paddlewheel. For a week my speedo has read zero, I figured it was fouled and went to clean it on Sat but the wheel is gone, the pin and hub are there, but the wheel itself is AWOL.

 

I've tried everywhere to find one, Navico, Gemeco, eBay, CL, etc. etc.Does anyone have one or a source or any leads on where I might find one? It's a shot in the dark I know but with all the failed displays out there, there has to be a mountain of transducers and paddle wheels. I'd like to keep this stuff going for a little while longer.

 

Any and all help would be appreciated.

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I had an extra unit that I put in an Alberg 22 that i restored and sold. If I had known a couple of months ago I would have kept it out for you. Sorry.

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I saw that one but the pic looks like its from a 3100s with the tri-ducer. But thanks.

 

HELP!!!!

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Yeah, since I work with reading proximity sensors and other industrial sensors I was thinking the same thing. Airmar makes ~90% of the speed transducers however it appears the Navman speed 'ducer was not made by them and actually made in NZ and is the 10% outliers. Since the technology is pretty elementary and I doubt Navman invented a whole new technology but is like the rest of the 90% of the 'ducers made it merely has a magnet and a sensor to count the revolutions. I was going to raid a supply of Raymarine parts and test to see what kind I would get using an alien paddlewheel. I hesitate to say it, but I may for the first time ever bring my 'sillyscope to the boat and see what I can see.

 

I first imagined a pile of useless Navman/Northstart gear waiting to be plundered. Thats proven not to be the case.

 

I most likely will chuck it all and go with B&G Tritons over the winter but am very biased against any Navico product given the wonderful experience being a Navman early adopter.

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I've spent hours on this, no the 3100/310 speed transducers are not Airmar parts. A call to Airmar to a person recommended by someone at Gemeco (they sell almost all kinds of transducers) confirmed it. The picture you show above is not the 3100/3100 and is not the same size and will not fit in the exiting hole (according to Airmar, they have a great cross reference tool on their site, I also called to confirm). And the paddle wheels were sourced only from a single place in NZ (they may have be manufactured elsewhere, but I've not gotten past this point).

 

I've spent way too much time on this, but Navico, Airmar, and Gemeco all have been helpful, but to no avail.

 

I'm still hoping for a dead unit to pop up somewhere.

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Mine started life as a Navman 3100 system. As all the displays failed within warranty they were swapped out. 3 out of 4 failed again. Swapped out again, this time, again gratis for the Northstar 310's. So the 'ducers are Navman parts. The depth IS an Airmar part, the speed is not. The hole is different size that the later ones or so I have been told. I am going to mic them tomorrow.

 

Since I work with industrial sensors I am guessing the paddle wheel is just a magnet that has a prox sensor counting revs. I may get the Airmar 6 blade paddle wheel and see what happens. I think it's worth a $30 shot.

 

I've put so much time into the stuff, I can repair the displays and have replaced the Hall sensors in the wind wand I want to keep it going, like that old Nova with 225K miles.

 

Not really, I do want Tritons and full NMEA2K system. But spending more money with Navico after they killed off Navman/Northstar is sort of a drag.

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Everything I have is networked so I can have it show GPS speed. Since I race in an area where currents are key, I have the BSP display right above the Multi I have showing SOG (or WVC (VMG)) so I can see in real time the current effect. I am a gizmo sailor. I calibrate the BSP constantly so I have it pretty close to actual speed thru the water most of the time.

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I have a Navman multi 3100 that has the paddlewheel your chasing , my unit is connected to my GPS , you wouldn't be able to find a wind transducer for my Navman w3100 by any chance ? We could do a swap.

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I actually do have one but it reads eratically or not at all, I don't remember. I think it may be the same problem as the other one I have, the Hall effect sensor is probably bad. The on the top of my mast is reading sporadically and I was planning on pulling the mast and reworking both over the winter.

 

You will need the Wind 3100 to decode the signal from the wind transducer tho I believe. The processing is done in the head unit. I have at least 2 or 3 of these, but none work correctly. One has no NMEA out, and I have an analog 3150 that the LCD doesn't read. Another analog 3150 I have in pieces I was trying to repair the LCD display but the zebra stripe fix doesn't work on the analog units so it will be scrapped.

 

One of the displays would be fine IF it processes the signal you could read it on the Multi display. But I'm not sure any of the wind displays works correctly,

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BUMP! C'mon, there has to be one out there somewhere..

 

I took an old Airmar wheel from my Marina's scrap pile. It was a 4 blade, not a six like the original. It was also larger in diameter than the original and narrower. I tried it out. It would not spin freely BUT it did register speed on the display. I stuck it in hoping the hydro effect would spin it but no such luck.

 

So not I need a smaller wheel. I estimate the wheel diameter to be 1 7/8"? I can get a similar looking wheel from Airmar but it's for the Navman high speed transducer, 50 kts is mentioned in the catalog. It looks similar to the original but I cannot find any specs on it.

 

So am I correct there is a Hall effect sensor just reading revs and if I could find a compatible size wheel I might be good? I'm thinking since an old scrap wheel registered speed I may be good to go if I can fit one.

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Yes absolutely. I will send you a PM. What do you want for it? The extra wind wand I had is totally non functional and I cut the wire right at the mast mount block to make a bench test fixture for the wind wand 2 years ago when I replaced the Hall sensors in mine. I may have spare displays, I got good at fixing the missing digit displays, I can poke around and see what I still have, I sold and given a lot away.

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Hi Drew

I don't want anything for it ' my display is fine my problem is the wind transducer but to be honest I haven't even looked at it ' could be a dry joint .

Anyway I have your address and I will send it off today.

Good luck with it it should be ok though , I put it near my compass and the compass went crazy.

 

Al

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Muchos gracias! I owe you one sail on Buzzards Bay with beer & rum!

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I had the same problem: pin and hub still on the transom transducer, but no paddle wheel.  I think it's been like that for some time.

So I designed and 3D printed one: https://www.thingiverse.com/thing:2824820

You'll need some tiny, cheap magnets from Amazon (or wherever) to superglue in the holes.  I've yet to test it on the water (too cold) but it registers when it freely spins, so please use at your own risk!

Martin

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I know this is an old thread but still hoping you and Neil G (Netanya) still have a passion for Navman. I have a three Mast head units and three Head units and on each of them I can't get a speed reading.

I have used Neil's magnificent circuit diagram to get one mast head unit to fix the direction problem but I'm having trouble determining the speed fault. 

Of the two I have at home one is the circular disc style mentioned in Neil's post and the other is a more modern style as shown in the pictures. I think this one was working but I spiked the speed Hall effect transistor (bottom right of second picture) when trying to take a voltage reading. I replaced it but now no speed. Could you or Neil if he is following this thread advise of the voltage I should be expecting on the blue wire and the variance +/-.

I am having trouble sourcing the switching Diodes A6w and A7w (BAV99) or at least in quantities less than a 1000 here in Australia.

Any insights gratefully accepted

Regards,

David

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