Nasa log

[PabloPicasso]

I would like to replace my paddle wheel lof with a nasa electromagnetic version.

Anyine know what the difference between the EML 2 & EML 3 versions are?

I have a display in the cockpit (not Nasa) that I'd like to connect to

Thanks

Are there other manufacturers of electromagnetic log units?

 

[PabloPicasso]

I would like to replace my paddle wheel lof with a nasa electromagnetic version.

Anyine k ow what the difference between the EML 2 & EML 3 versions are?

I have a display in the cockpit (not Nasa) that I'd like to connect to

Thanks

I

 

[Martin_J]

The manual is here at NASA..

https://www.nasamarine.com/wp-content/uploads/2023/02/EML-2-3-Manual.pdf

Looks like the first outputs in nmea0183 and the other as pulses which I fed into an NMEA convertor (optional from NASA with the EML). Your choice will depend on your display input requirements.



FWIW - I did fit one earlier this year but haven't really had the chance to test it.

What bugged me was that I had two bronze through hulls, one of which I had to remove to fit the NASA plastic through hull.. I would have preferred to use one of the original bronze through hulls, but it transpired that the diameter of the EML transducer was about 1mm less than the internal diameter of the bronze fitting that I had used for DST800 type transducers.

NASA also suggested the EML transducer should not be installed in a metal through hull. I found this a little odd because one of the other manufacturers of an electromagnetic speed transducer will supply them with bronze through hulls. Maybe I'll revert to bronze another year if I can find the right internal diameter.

 

[Martin_J]

Replied in your other thread!

 

[PabloPicasso]

Which other manufa turers do electromagnetic logs?

& thanks for the summary above

 

[Martin_J]

NKE do one... but I'm racking my brains trying to recall which suggested (in their fitting instructions) that use within a bronze through hull was fine.

 

[Martin_J]

In the meantime, if you do buy the EML-2 (so that you can connect to a NASA NMEA2000 convertor), then one thing you can do to save having to run the extra power supply lead for the EML-2 box is to power it with12v direct from the NMEA converter as below...



Then for even cleaner solution, you can even dispose of the plug in power connector and just wire that power cable direct to the -ve and red screw terminals on the EML-2 box.

Although the instruction sheet suggested you could power an instrument 'from' the red screw terminal, NASA did confirm it"s fine for power in via the screw terminals (since they're directly connected to the power socket).

 

[Martin_J]

I still don't think it was the NKE that I was reading about last year, but the NKE installation manual does mention that you can use a bronze through hull (but why suggested for a wooden boat and not GRP???)

https://www.nkeitalia.it/wp-content/uploads/2016/06/Manuale_Trasduttore_Log_Elettromagnetico_ENG.pdf




And within that manual

 

[Tranona]

The bronze in wood hulls recommendation is because there is a possibility that expansion and contraction of wood can damage the normal plastic through hulls used for transducers.

 

[Martin_J]

The bronze in wood hulls recommendation is because there is a possibility that expansion and contraction of wood can damage the normal plastic through hulls used for transducers.

I understand that part about bronze being the only recommended solution for wooden hulls.

What I don't understand is why the statement didn't include bronze actually being a better (or even a possible) solution in GRP.

 

[Snowgoose-1]

What I don't understand is why the statement didn't include bronze actually being a better (or even a possible) solution in GRP.

Bronze is pricey. Ouch.

Lowrance / SIMRAD / B&G / Airmar DST810 - Through Hull Bronze Multisensor Transducer - NMEA2000 B617V

 

[Tranona]

I understand that part about bronze being the only recommended solution for wooden hulls.

What I don't understand is why the statement didn't include bronze actually being a better (or even a possible) solution in GRP.

Because you really don't need the properties of bronze in hulls made of stable materials. The normal plastic is fine - no benefit from bronze, nor any downside if that is what you have.

 

[Martin_J]

It just felt like a backward step replacing one of my two bronze through hulls with a plastic NASA one (whose instructions suggesting adding a ring of filler around it to be sure) when the EML transducer was such a close (but not quite good enough) fit..

If I'd been able to leave the bronze in place then I'd have kept the choice of whether or not to put a standard sized transducer bag into the hole should the need arise.