Thanks Chris. Wouldn't be quite as bad but I'm chasing problems in my E7, as well. Last week my FBL controller browned out three times. I got lucky twice but the third time, it happened as I was landing and the heli just kind of dropped out of the air from about 15 feet. Destroyed a brand new set of Rail 716 mains and a set of Rail tail blades, too. It also started making this hollow buzzing sound at all rpm ranges.
After emailing back and forth with Skookum, I thought the brown outs might be caused by the wiring between the flight pack and the FBL controller. I bought some new 3" servo extension cables with the largest diameter wire I could find. I also replaced all three main shaft bearings, as well as the main shaft. First flight out was good (except it's still making the noise). On the second flight it browned out again on landing. Luckily, I was only about a foot off of the ground. I replaced that controller with the SK540 from my E5. A couple flights yesterday went well (except the noise that still persists). On flight number four, the motor momentarily shut down. I was able to land okay and this time, the LED on the SK540 was still green, so no brown out. I looked at the log file from the CC ESC and it never saw over 100 amps on any of those flights. I thought maybe I had hit over current. Anyway, I went ahead and swapped out the ESC with the 130A Scorpion commander I have and I tried again today. I still don't know what to think after the last flight. It seemed like I hit LVC at some point.
I just pulled the motor apart and the dust cover retaining clip on one of the bearings popped out. That's the same little clip that destroyed my Hacker motor. grrrrr. Anyway, by some miracle, I had the right size bearing to swap out so I have re-assembled the motor and I'm going to go give it another try later (if the thunder storms pass by).
So, yeah, awesome weekend so far. I also ended up having to order new blades for the N5C because one of them got cracked pretty bad in the crash, after all.
