SIMON CRAGG Posted June 27 Share Posted June 27 A club mate landed his 5 series motor powered P51 in some long grass and did not kill the throttle completely. The motor kept trying to turn and smoked the esc. The motor seemed stiff to turn, and still does, despite changing the bearings. There is no obvious burn marks or damage to the innards. It must be some sort of damage to the windings etc. as the magnets seem to be stopping the motor turning smoothly. Any any ideas...or is it a bin job?. Quote Link to comment Share on other sites More sharing options...
J D 8 - Moderator Posted June 27 Share Posted June 27 Have recently had similar issue with mini foam Spit. It just started to feel jittery as you turned it over by hand and was down on power. Had a look in motor but could see nothing to go on. Replacement on the way. Quote Link to comment Share on other sites More sharing options...
Zflyer Posted June 27 Share Posted June 27 Well i had something similar, magnet had come adrift. Being a bit of a skinflint and idiot (adventerous) epoxied it back in. Lo it works fine, so far.. Quote Link to comment Share on other sites More sharing options...
Keith Billinge Posted June 27 Share Posted June 27 If the motor got hot enough you probably cooked the glue that holds the magnets on. You can sometimes glue them back with CA but maybe safer in the bin. KB 1 Quote Link to comment Share on other sites More sharing options...
kevin b Posted June 27 Share Posted June 27 No alternative for safety's sake. Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted June 27 Share Posted June 27 If everything else seems OK It is possible that cooking the windings has caused a short circuit one or more of the winding to the metal armature. In this case the motor will behave as if the ESC brake is on. The faster you turn it the more the resistance. Still unrepairable unless you completely rewind the motor so it is a bin job. Moral of story all ways shut the throttle in a crash and preferably do so before you hit the ground! Not so easy to do as it needs a conscious effort as you are usually busy doing the utmost to stop it hitting the ground. 2 Quote Link to comment Share on other sites More sharing options...
SIMON CRAGG Posted June 27 Author Share Posted June 27 Thanks chaps Having done a bit more research, it looks as if the motor got that hot it shorted out and just became a big magnet!. Bin job. 2 Quote Link to comment Share on other sites More sharing options...
Philip Lewis 3 Posted June 27 Share Posted June 27 6 hours ago, Zflyer said: Well i had something similar, magnet had come adrift. Being a bit of a skinflint and idiot (adventerous) epoxied it back in. Lo it works fine, so far.. The magnets are held in with epoxy in the first place so if it's simply come unstuck the re-applying epoxy is just fine because that was how it was made in the first place, however there is a good chance that the reason it came lose in the first place was because the motor overheated, epoxy strong as it is has a fairly low melting point, you can actually remove it with a hairdryer set on the hottest setting, I've done that many times from composite fuselages, removes and cleans it up a treat. Quote Link to comment Share on other sites More sharing options...
Phil Green Posted June 27 Share Posted June 27 Save it for an autogyro bearing? Quote Link to comment Share on other sites More sharing options...
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