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Post by Dr. Evil on Nov 23, 2012 16:31:41 GMT -4
I think i found out why it lost power and didn't show up on the ESC log. After putting everything back together and spooling up, the pinion was loose. I had tightened it down with thread lock and even put a thin layer on the shaft to help the pinion grip. I've ordered the metal wheels as well, so hopefully the next maiden will go well. Glad you found out the real problem....which makes perfect sense.
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Post by moleculo on Nov 23, 2012 17:14:52 GMT -4
If I were you, I would file a small flat spot where the pinion setscrew seats or risk the same type of thing recurring.
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Post by Valkman on Nov 24, 2012 5:36:54 GMT -4
I knew it was not a stripped servo!! I'm glad you found the real source of the problem.
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lee
PARK FLYER
Posts: 68
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Post by lee on Nov 24, 2012 9:34:09 GMT -4
The initial problem that made me freak out, was still the servo wheel slipping ( I have taken the wheels off and you can see the teeth on the bad wheel are stripped). My reaction to that, was to punch it negative. Thats what made the pinion slip. I have now ground a flat in the motor shaft to stop this happening again. Why does the shaft not have a flat in it already? Thanks for all the advice guys. Much appreciated.
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Post by Dr. Evil on Nov 24, 2012 15:15:54 GMT -4
The initial problem that made me freak out, was still the servo wheel slipping ( I have taken the wheels off and you can see the teeth on the bad wheel are stripped). My reaction to that, was to punch it negative. Thats what made the pinion slip. I have now ground a flat in the motor shaft to stop this happening again. Why does the shaft not have a flat in it already? Thanks for all the advice guys. Much appreciated. I may have missed it but what motor do u have? Most motor do come with a flat spot already.
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lee
PARK FLYER
Posts: 68
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Post by lee on Nov 24, 2012 18:49:07 GMT -4
I have the 740KV Scorpion Today didn't go too well Motor and pinion is great now, no slipping servos But.... I dumb thumbed it in during a piro flip. Too much collective. I should have taken it easy having up graded from 6S to 8S, but you live and learn. My only concern is something that happened just before i crashed. I actually recovered the bird about 2 meters from the ground, level and stationary, but the instant i centred the sticks, it flipped over and smacked into the ground? I'm using an AR 7200BX FBL unit. I'm not going to blame anything but my dumb thumbs, butit did seem weird, like the inputs from the TX was behind what the heli was doing or something. Well we won't know till the next time.
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lee
PARK FLYER
Posts: 68
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Post by lee on Nov 26, 2012 11:05:32 GMT -4
Ok dismantled my Bird after the crash. Now i'm 100% sure it was the servo wheels slipping on the splines. When levelling the swash today i found that one aileron servo was at its extreme limit instead of centred. So i tried to turn the servo wheel and it slipped. The screw was still in tight, nothing was loose. This is why in the first crash it carried on in a direction i wasn't telling it to, and just before the second crash, when i had recovered from the piro and centred the sticks, it then flipped on its back and drilled into the ground. So why after 1.5 years of no issues would this have happened? My conclusion is, having upgraded to 8S, I wasn't accustomed to the response time of the heli during manoeuvres. My efforts to correct the heli where extreme. The fact that i had upped the servo voltage from 4.8 to 6V was putting more than the usual pressure on the wheels, causing them to slip under extreme load. I have now installed the metal Align servo wheel. Unfortunately the crash has ment a need to order some more parts. But considering the power and speed it hit the ground, I am super impressed with the strength of the Chaos 600. Blades, gears and base plate are all that broke. I absolutely love this bird and it hurt me to see it go in for the first time in 1.5 years of awesome flying. But it will be receiving some love and attention, and a new livery scheme on the canopy Cheers guys and fly safe
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Post by Dr. Evil on Nov 27, 2012 9:07:40 GMT -4
Well, I hope you get it all fixed and back into the air soon. I do think the thicker carbon main frames do take plenty of abuse which is a plus when she decides to take a dive every now and then. Good luck and thanks for the updates.
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