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23 grams of thrust, baby!

After trying many combinations of commercial brushed and brushless motors, we resorted to winding our own. I didn’t think this was feasible but came across this site: http://www.strongrcmotors.com/ Don, the proprietor, was very helpful and gave us some tips on winding a motor around our needs (as you’ve read many times, 200 mA draw, as much thrust as possible).

The kits are made from CDROM motors and customized parts. Usually, these are used for home-built RC planes so we had to experiment quite a bit using thin wire and lots of winds. It was then that we found out that commercial brushless motor controllers wouldn’t work at low current draw so we built our own.

The magic formula is (and this is the result of easily a month of investigation so please at least pretend like you’re excited) 100 turns of 38 gauge magnet wire. That’s specific and tuned to our purpose: high pitch, 2 bladed, 2 inch prop underwater running at 100% duty cycle. 38 gauge wire is about twice as thick as human hair (Science Nerd measured it).

I would post a picture, it would look a lot like any other failed attempt (blog Aug 6th entry).

This entry was posted on 6. September 2009 at 14:18 and is filed under Uncategorized. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response or trackback from your own site.

8 Responses to “23 grams of thrust, baby!”

  1. Don says:
    7. September 2009 at 14:00

    Great project!
    Congratulations on the motor and controller development. Sounds like you have a good power train.

    What’s next after the short lake testing?

  2. Sean says:
    7. September 2009 at 18:49

    Thanks Don,

    Our next step is to put the new motors and controllers in the GPS boat and navigate across the lake - about 1 mile. The purpose is to get an accurate measurement of speed. We’re hoping to break 2 km/h. I think we’ve got a good shot.

    –
    Sean

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