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Old Oct 06, 2004, 09:25 PM
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Question
how to "break in" a sp400?

how do i properly break in a sp400(stock) for my ep sailplane?whats water break in?
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Old Oct 06, 2004, 10:08 PM
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Wilkes-Barre/Scranton, Pennsylvania, United States
Joined Nov 2000
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It isn't really necessary to break in a SP 400. Water break in simply refers to running the motor while it is under water. You will see the water turn cloudy as the motor runs. This is the dust from the brushes wearing to the commutator. The motor is run at a low voltage. I used two 1.5 v D cells.
I never saw any advantage to doing it. Speed 400 motors seem to run fine out of the box especially for sport flying.

BM
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Old Oct 07, 2004, 05:37 PM
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thank you for your input! really appreciate it.
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Old Oct 08, 2004, 04:19 AM
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East Anglia, UK
Joined Sep 2002
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I juts run em up at art throttle till the brushes bed in. Takes a few minutes.

Thing to avoid is massive current before they are bedded in - burns the commutator.
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Old Oct 17, 2004, 10:07 AM
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London, England
Joined May 2003
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I don't think it improves performance much but longevity can be greatly improved. I've broken in all my 300-400 motors. It takes much less time to seat the brushes in water and I've only had one 300 motor fail on my ss as I had run it hard on 8 cells for quite a few flights. It shorted out under full throttle on a steep climb out. All my other cheap can motors are still in service and running well.
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Old Oct 17, 2004, 11:05 AM
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Chattanooga, Tennessee, United States
Joined May 2003
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As vintage, so correctly, says..... if you don't bed in the brushes on the comm, then crank it to WOT first time out, you'll get a lot of arcing and pitting of the comm. It really is better to do a gentle water break-in.

Cheers, Phil
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Old Oct 20, 2004, 04:33 PM
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Dublin, Ireland
Joined Mar 2002
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A half hour on really low throttle, no need for water, although with water it is quicker.
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Old Oct 20, 2004, 07:27 PM
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Deer Park, Tx, USA
Joined Feb 2001
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I use 2 "C" cells in series, run motor in water for about 5 minutes ( turns cloudy ), after timing it for rotation direction. I think it has improved the longevity for me with not much effort expended. Most of mine have lasted more than a flying season
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Old Oct 20, 2004, 08:15 PM
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London, England
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I did once try to use one of those DC adapters which can switch voltage 3v, 6v, 9v, 12v
I set it to 3v and ran the motor suspended in water. Eventually, the adapter couldn't handle the amp draw and died. I think two cheap alkaline cells is definitely the way to do it.
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Old Oct 20, 2004, 08:33 PM
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.

Sorry, accidentally posted twice.
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