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Old Jan 31, 2012, 09:37 AM
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Little Screamers Super ParkJet motor rewind help.

I have a Little Screamers Super ParkJet motor that I managed to burn up using the recommended setup and since LS is no more I want to rewind it to see if I can revive it, any suggestions?

What gauge wire does it use? How many turns and what is the pattern used? Has anyone ever rewound one of these? Any help would be greatly appreciated.

Thanks,
D
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Old Jan 31, 2012, 12:10 PM
Dave North
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I never did rewind a parkjet, just the original model. Don't worry too much about the wire that was used since they generally underwound the motors anyway. Use something thicker if you want a better result. You should be able to get a turn count when you clean off the old wire -- just be careful. You should also be able to get the gauge by using a caliper if you can borrow one.

I'll bet somebody will turn up who knows at least one of the turn counts (they often changed that from time to time).

Dave
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Old Jan 31, 2012, 06:55 PM
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There were 6 windings per pole, 9 poles total. I used a micro torch to get all the epoxy off one piece of wire to measure it with a caliper, I came up with 0.60mm.
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Old Jan 31, 2012, 09:18 PM
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The only LS motors I know the gauge for are my original Scott-wound De Novo PM 17T/26ga.... ~1125Kv), a prototype De Novo (maybe the same as the most recent production version (15T/25ga... ~1100Kv), a production Purple Peril (12T/24ga... ~1810Kv... LS spec was 1550Kv) and a production Park Jet (8T/23ga ... ~2450Kv...LS spec was 2900Kv). I don't know the wind on the 42g SuperParkJet, but the LS spec was 2350Kv... mine came out at ~1845Kv)
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Old Feb 07, 2012, 01:52 PM
Dave North
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That's probably 23 awg. With any luck you could do the same wind with 22 awg and get a better result. However, using a torch you may well destroy the stator insulation ... which creates its own set of problems.

Dave
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Old Feb 07, 2012, 08:04 PM
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I talked to Dan at gobrushless.com and he hooked me up with some microdan 23awg and some loctite 410. I re-wound it and did a continuity test on all the wires against each other and the stator and it looks like I managed to re-wind it without shorting anything. Hopefully I'll get to power it up later and test it out.


It may not look like it but all the insulation on the stator was fine, it was just a little charred.
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Old Feb 07, 2012, 10:56 PM
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Spun it up on the bench without a prop and everything seemed fine. Hopefully I'll get to test it good tomorrow.
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Old Feb 08, 2012, 12:55 PM
Dave North
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Looks pretty darn fine to me. Good luck on the test!

Dave
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Old Feb 08, 2012, 03:29 PM
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Thanks, test went great. on a 3s batt with a 6x5.5 apc thin-e prop I got about 19oz static thrust and about 16amps. I'll try it out in the air tomorrow if the weather holds out.
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Old Feb 09, 2012, 09:40 PM
Dave North
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Lookin good so far ...

Dave
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Old Feb 10, 2012, 12:35 PM
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First few flights went great.
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Old Feb 10, 2012, 02:12 PM
Dave North
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You win! All done.

Dave
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Old Feb 10, 2012, 07:21 PM
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Just FYI... with the original LS SuperParkJet (~42g, ~1845Kv), this is what I got with a 6x5.5 APC E on 3s:

10.8v, 14.70A, 158W, 14340rpm, 74.7mph, 485g, 17.08oz, 3.07g/W
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Old Feb 10, 2012, 10:10 PM
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Quote:
Originally Posted by Dr Kiwi View Post
Just FYI... with the original LS SuperParkJet (~42g, ~1845Kv), this is what I got with a 6x5.5 APC E on 3s:

10.8v, 14.70A, 158W, 14340rpm, 74.7mph, 485g, 17.08oz, 3.07g/W
Thanks for the info. I've been looking at your website, tons of info, nicely done.

What is the speed column referring to?
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Old Feb 11, 2012, 05:09 PM
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"Speed" column is calculated pitch speed... from "mph = RPM x indicated pitch in inches/1056".

Since actual pitch is probably often not the same as what is printed on the blade... the accuracy of "speed" is moot
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