START HERE |
|
Register | FAQ | PM | Events | Groups | Blogs | Calendar | Mark Forums Read |
Unregistered
|
Electric Motors, Gearing, Speed Controls, Gyros, Receivers, and Other Electronics Discussion Electric Motors, Gearing, Speed Controls, Gyros, Receivers and Other Electronics Discussion |
|
LinkBack | Thread Tools | Display Modes |
05-09-2015, 11:20 PM | #1 (permalink) |
Registered Users
Join Date: Jan 2011
|
SOLVED: Can a crash kill my ESC? <It was a slipping OWB>
I didn't pull up fast enough with my 450 and ran it right into the grass. It hit going fast and almost like you'd land a plank. The crash broke a blade and two cyclic servo arms and bent the main shaft as badly as I've ever seen--about 60 degrees. Now after I rebuilt the heli, the Castle Ice 50 Lite still boots up normally and gives me the normal beep sequence and everything looks fine, but the heli only spins up to about 500 RPM.
It's not the battery and I didn't change any settings. Is it possible that even though the ESC had no mechanical trauma, somehow a spike or back EMF or sending power to a suddenly stopping motor killed the ESC? The ESC is being governed by a Vbar, by the way. <Later...> It occurred to me after I wrote this that I should try turning off the Vbar governor and try just running the ESC in plain old Castle "Set RPM" mode to eliminate one variable. I'll try that tomorrow. I'd still like to hear any opinions, suggestions, experiences, etc. Thanks. Last edited by Harbormaster; 05-10-2015 at 09:53 AM.. Reason: Figured it out... :P |
Sponsored Links | |||
Advertisement |
|
05-10-2015, 09:52 AM | #2 (permalink) |
Registered Users
Thread Starter
Join Date: Jan 2011
|
It's a slipping one-way bearing! I took it out to the driveway this morning and started it up in plain old Castle "Set RPM" mode and got the same behavior: the rotor came up to about 500 RPM and stopped increasing. Only this time I noticed that the motor whine was increasing in frequency when the blades weren't. I grabbed the gears and twisted them and sure enough, the one-way bearing isn't holding.
So can a crash kill an OWB? Later still: the OWB bearing had broken free. I wonder if long exposure to the oil on the bearing eventually weakened it and the shock of the crash did it in. In any case, it's fixed now! Last edited by Harbormaster; 05-10-2015 at 03:12 PM.. |
Thread Tools | |
Display Modes | |
|
|