You can find a very affordable tachometer in most hobbie shops that sell model airplane motors. They use a photodiode to count the prop passing. Use two flaps of tape on your prop shaft, and a flashlight to get the speed (set the tach to 2-blade prop).
Arby
From: Matthew Geier <matthew@acfr.usyd.edu.au>
To: electricboats@yahoogroups.com
Sent: Friday, October 26, 2012 5:42 PM
Subject: Re: [Electric Boats] Re: Lead battery charging
On 27/10/12 09:58, Arby bernt wrote:
>
>
> Dear Matthew,
> No e-boater should be without a clamp-on amp meter. Make sure you get
> one with a DC range, as most measure AC current only. No need to open
> connections that way, and you can use it in many other locations as
> well. Check eBay for DC Clamp Meters.
>
I've got one of those too. Lives in my boat tool kit. I also bought a
contact-less thermal probe at the same time so I could accurately see
how hot my motor was getting.
A RPM probe might be handy to add.
>
>
> Dear Matthew,
> No e-boater should be without a clamp-on amp meter. Make sure you get
> one with a DC range, as most measure AC current only. No need to open
> connections that way, and you can use it in many other locations as
> well. Check eBay for DC Clamp Meters.
>
I've got one of those too. Lives in my boat tool kit. I also bought a
contact-less thermal probe at the same time so I could accurately see
how hot my motor was getting.
A RPM probe might be handy to add.
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