Originally Posted by Smoothcruizer3
You have really great info and knowledge..... thank you very much for this.... I will run into you in the other thread (power systems) for any other questions.... Thanks again
Back in the mid 1980's before high powered motors were available, I was taking burned up brush type motors from work, rewinding them for more power, and putting them into models.
These were 24 volt permanent ferrite magnet type motors. The iron slots in the armature were only 1/2 filled originally by the mfgr, I managed to double the motor efficiency by actual dyno tests by filling the iron slots with heavier wire.
Problem was, the motors commutator for the brushes could not handle the extra current, and motor life was only a few flights before a meltdown. These motors were running about 15 Amps at about 20 volts.
Astroflight came out with their cobalt high powered brush type motors, and those motors from work were not even close.
Now we've got brushless motors, where even the lowest cost cheap China motors far outperform the very expensive Astroflight brush type motors typical of the 1980 to 1990's. Of course the Astro motors used top quality steel, bearings and so on. but my last Astro 40 brushless type motor used a brass gear on the motor shaft, and an aluminum gear on the prop shaft. That setup didn't last more than 40-50 flights before the gears were worn out. And I totally enclosed the gears with a top quality gear lube.
How times have changed in the past ten years.