Hi Rob,
As usual, the anwer would have to be "it depends". Different motors will handle water differently.
While researching this answer, I found that Perm (the German motor manufacturer) does list the IP Codes (International Protection Rating) for their products. If you look at their DC motor, the PMG 132, an air cooled replacement for ETEK motors, it has a IP code of IP 20. That means that it is protected against solids of > 12.5mm (fingers or similar objects) and it is not protected from liquids. Most open frame motors will probably fall into this rating.
Alternatively, their synchronous motors, PMS 080 through PMS 156 are rated as IP 54. IP 54 means that the motor is dust protected and is splash protected, "Water splashing against the enclosure from any direction shall have no harmful effect".
Nanni doesn't publish this kind of technical data about their hybrid add-on to their diesel engines. I do think that 35kg is a little heavy for a 5 to 7kW motor, but that's just my opinion.
So when you say "handle sea water" do you mean dripping, splashing, a solid stream of water or complete immersion? In case you're wondering where I pulled up those terms, they are all different values in the IP Codes. Your marine equipment like radios, switches and instrument displays should all have IP ratings. If you google "IP codes", you should be able to translate those values into something more meaningful.
I do know that many small electric motors will continue to operate when submerged, but they don't survive long after the immersion event due to corrosion. Before you ask, I'm not willing to offer up my Mars PMAC motor for scientific research. ;)
Fair winds,
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, "Rob" <dopeydriver@...> wrote:
>
> A serious question.
> I was thinking about my current boat , when I first got it, and it always had water in the bilge.
> In fact , the sump of the old Yanmar was almost always in a couple of inches of water , but it still started and ran ok .
> Of course I have rectified that situation , she is a nice dry boat now , but it got me wondering.
> How well does an electric motor handle sea water ?.
> I'm guessing it would kill the motor pretty quickly.
> And now I'm wondering about the Nanni setup , and whether it is water proof.
> So , a serious question , could you please tell me what happens to an electric motor if it gets wet while running , and/or gets wet , and is then turned on ?.
> And does anyone know about the Nanni setup ?.
> Regards Rob J.
>
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