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Old Jun 19, 2012, 04:58 PM
MassiveOverkill's Avatar
United States, FL, Melbourne
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What timing should I set my Seaking 120A ESC

So I have a CF2812 3300KV 8 magnet pole, 12 coil brushless on 2200 mAh 3S 30C batteries. What should my ESC timing be?

Pics:

Left motor is a standard CF2812 brushless. Right is Joysway frankenbrushless that I can't find anywhere. They removed 6 magnets (14 on left, 8 on right) and beefed up the gauge of the windings:



Motors put back together:



Windings of the stock Joysway Frankenbrushless:

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Old Jun 19, 2012, 06:03 PM
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So the motor on the right is a stock motor..................you didnt remove the magnests?
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Old Jun 19, 2012, 06:39 PM
MassiveOverkill's Avatar
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No, Joysway did that. I say Joysway because Google to infinity doesn't bring up any motor in this configuration. Actually I wish I could reproduce this configuration as I could just modify a standard CF2812 motor. If you look at the Joysway, the magnets are slightly bigger and if you look close, you may be able to see the slots machined into the outer hub to hold the magnets in place while they are epoxied.
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Last edited by MassiveOverkill; Jun 19, 2012 at 09:21 PM.
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Old Jun 19, 2012, 06:50 PM
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Does the manufacturer of the motor have any reccomendations? I would probably start at 7.5 degrees and re-assess the situation from there if you have nothing else to go on. Typical smaller/higher kv outrunners run relatively low timing relative to larger outrunners.
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Old Jun 19, 2012, 09:39 PM
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No recommendations, but Google says usually lower pole motors run lower timing while the more poles you get the more timing you can add.
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Old Jun 19, 2012, 10:02 PM
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Quote:
Originally Posted by MassiveOverkill View Post
No recommendations, but Google says usually lower pole motors run lower timing while the more poles you get the more timing you can add.
Higher pole count outrunners sometimes run higher timing, but they are also usually lower kv and low RPM setups.
Take, for example, the scorpion 3126 brushless outrunners. They are 8 pole motors and scorpion reccomends 5 degrees of timing.

Since you have a modded motor it's unknown how it will react, but I would try 7.5...check speed and temps relative to run time and adjust the timing next run and check again.
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Old Jun 21, 2012, 07:34 PM
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OK guys, I got my Seaking 120A ESC installed and man this thing jumps out of the water!! I've only done short 1-2 minute runs and the motor is running really hot. The driveshaft is pretty friction-free, but as I said in the other thread, a little heavier than the stock drivetrain. I went from a 30mm prop to 32mm. I guess I could go back but I don't think it's the prop.

I've tried 3.75, 7.50, and 11.25 ESC timing and she still runs hot. If it's a timing thing, it should run cooler the lower the timing I use right? Cooling tube spits out a nice stream of water.

What do you think, try 0 degree timing? BTW I'm glad I got the programming card.

Oh, it's weird hot the motor responds to timing. When I had it at the most advanced of 11.25 the drivetrain sounded like a bumble bee, whereas the lower the timing I used the smoother she ran. I think I just answered my own question but would like more input.

Thanks.
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Last edited by MassiveOverkill; Jun 21, 2012 at 08:34 PM.
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Old Jun 21, 2012, 11:02 PM
MassiveOverkill's Avatar
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I had to ditch the new compression collette as it was too heavy and unbalanced. I drilled out my old brass collette to accomodate the larger .130 flexshaft as well as put some hot glue at the bottom of the motor so it mates with the plastic and vibrations are much less now.

Old collette was only 7 grams, new one was 12.
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Old Jun 22, 2012, 06:16 AM
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Heavy won't add vibration, but unbalanced could.

Did you switch from a 30mm plastic prop to a 32mm metal prop? Did you add more pitch too?
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Old Jun 22, 2012, 07:48 AM
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Well the magnet casing probably isn't perfectly balanced, so the heavier motor coupling just made things worse (in addition to itself not being balanced). Vibration in the orginal setup as just a small buzz, with the new motor coupling, it was a big racket.

Went from plastic to plastic. I'm guessing my stock 30mm shaft fit the same dimensions as the one from OSE. I got the OSE 32mm

30mm Diameter, Pitch 1.4x30=42.0mm or 1.65"
32mm Diameter, Pitch 1.4x32=44.8mm or 1.76"

I'll know tonight after work if swapping the orginal collete back in did the trick.
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