I used to work with electric r/c cars... so im not sure how important it is to planes... Id assume its just as important... it cant hurt
So, Yes break in's do matter.
The comm is round, and the brushes are square. Until the motor is run for about 45 min, the motor will perform poorly because hte contact between the brushes and comm will be poor. There will be a lot of arcing across the poor connection, pitting and burning the brushes and comm, which will further degrade the performance - permantly
so what you'd want to do is buy a radioshack 2x D Cell battery holder and some alligator clips. Put a couple of regular D Cell Alkaline batteries into the D cell holder, and hook it up to the motor with the alligator clips. Let it run like that until the batteries go dead.
Yes.. its only 3 volts... this will reduce arcing while breaking in the brushes.
If you really want to do it right, get some trinity comm drops, or break in drops. These keep the comm and brushes clean and lubricated, as well as enhance electrical conduction.
As for a water break in...
Ive heard of doing that... you'd have to re-lube everything in the motor....
I think its too much work. For a regular backyard basher (or in the case of planes, a weekend flier), a 2x D cell break in is perfectly good - no need for water.
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