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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Premature wearing on dampeners
01-22-2018 09:15 PM  3 years ago
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InvertedDude

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Premature wearing on dampeners
I was hoping we could compare wear and tear. I have a theory that electric motors pulse on power delivery comparied to a nitro with a clutch.

On my trex 600esp and raptor e620. I am having to replace dampeners every 30 to 40 flights.

My nitro dampeners are the original ones and still going strong. I am harder on my nitros than my electric. I really don't understand why I am having these issues.

I have set the headspeed at 2k on my electric....it doesn't matter until dampeners are replaced.

Any ideas?
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01-22-2018 09:53 PM  3 years ago
Pistol Pete

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If both heads, dampeners, head speed, blade pitch and weight are all equal, then perhaps its the nitro that prolong them...(?)

Just taking a dab at it.
~~Enjoying the hobby one flight at a time~~
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01-22-2018 10:46 PM  3 years ago
RM3

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InvertedDude I have a theory that electric motors pulse on power delivery comparied to a nitro with a clutch.
not really... the brushless motors are simply three phase motors. the more poles they have the "smoother" they are. the moving part of the motor is simply attracting and repelling the magnetic field which is changing between the three phases. they are very very smooth, so the torque pulse from one phase to the next is like 30 degrees for a 12 pole motor... on a nitro (or gasser ) the torque pulse is once every rotation...this is why a heavy flywheel on big gassers provide smoother engines compared to those that dont use one. then take into account the gearing and the torque pulse is even a smaller degree percentage of one full head rotation... so your nitro is beating on your dampeners alot harder than the electric

I think maybe it has more to do with the oil residue keeping the dampeners healthy...
showing a preference will only get you into trouble, 90% of everything is crap...
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01-22-2018 11:58 PM  3 years ago
ICUR1-2

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Just an observation.... If the electric motor was harder on the dampners it would also show up in the gear mesh as well. Are you wearing out main gears as well?
spending time, paying attention
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01-23-2018 01:29 AM  3 years ago
InvertedDude

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Main gears still look new. I use paper to space the gearing! You tried to get me on it! LOL j/K!
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01-23-2018 01:39 AM  3 years ago
ICUR1-2

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so if gears are good and no abnormal wearing then it would be safe to say it's not the drive train or motor. More than likely your slimer(nitro) is keeping the dampners healthy.

I expected to see deterioration instead, due to the nitric acid in the oil.
My 600N shows little signs of this here and there.
Then again I keep putting it away dirty and just rebuild it in the winter.

spending time, paying attention
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01-23-2018 01:40 AM  3 years ago
InvertedDude

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Alright, I will just fat coat it with lithium grease to see if that solves the problem?

What grease for cold weather for electric heads? It is cold in AZ and my helicopters are rebelling! Nitro still running strong and powers it away!
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01-23-2018 03:18 AM  3 years ago
ICUR1-2

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InvertedDude What grease for cold weather for electric heads?
I don't know I have never greased my dampners... does it help ?
spending time, paying attention
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01-23-2018 04:23 AM  3 years ago
InvertedDude

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Greased it, it is colder now. The helicopter still shakes, going to split frames and install new main mase bearings.
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01-23-2018 05:37 AM  3 years ago
ICUR1-2

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Did some reading apparently ATF fluid is what should be used.

Have you balanced the head ?
spending time, paying attention
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01-23-2018 07:08 AM  3 years ago
InvertedDude

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How do you balance the head? I have flown so many different blades. No balancing issues, but I will say this I am suspecting that may be the issue now. It never was a problem until recently.

Balancing the entire rotor head is the next step. Do you have a guide to make it easy?

I did swap out 600mm to 550mm. The helicopter was rock solid running 550mm blades. Can the E550 frames handle larger blades/boom?
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01-23-2018 08:29 AM  3 years ago
InvertedDude

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http://www.rchelisite.com/rc_helico...e_balancing.php

Went and balanced my blades. I was surprised they were off. CF blades are expensive! I guess the cold air forces any error on your helicopter to show up! Flying with 600mm blades smooth! Guess, I will be balancing all my blades despite what the factory says! Good experience learning all the problems of RC helicopters!
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01-23-2018 01:07 PM  3 years ago
ICUR1-2

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Ottawa, Ontario

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I use a high point balancer with a spare main shaft you mount the head side ways. Or you try using a jewlers scale and weigh the left and right side as you assemble the head.
Never assume quality from the factory. I have come across blade grips that had a 10 gram difference, yes they sent a new grip.
spending time, paying attention
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01-23-2018 08:42 PM  3 years ago
InvertedDude

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Problem was OBL 44/11-30H 1150 KV motor failing
The motor made the same wobble with 550/600mm blades. Of course, I can't hear the issue until the white magic puff goes out. Auto it safely from 4 feet. WOW! What other motors can I use with 9T/111 gearing?

When I first started with the motor it was smooth after a while it kinda bounced back and forth on spool up. Nothing serious, unknowing to me that was the first clue of motor failure coming. Learned something new!
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01-23-2018 08:56 PM  3 years ago
RM3

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you sure its the motor and not the ESC... or both?showing a preference will only get you into trouble, 90% of everything is crap...
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01-23-2018 09:39 PM  3 years ago
InvertedDude

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RM3
I put in a back up brushless motor...flew it a couple more times. How do u tell if the esc is going bad?
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01-24-2018 01:11 AM  3 years ago
InvertedDude

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Flybar Paddles
It was the flybar paddles getting loose in flight. Landing shows the paddles were tight. I went ahead and pushed the paddles harder into the side wall to tighten it down. The shakes finally went away!
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01-24-2018 01:29 AM  3 years ago
JuanRodriguez

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The Villages, Florida

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Oh my !
Glad you finally found the real issue !!
Been there, done that and old enough to know better.....
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01-24-2018 02:05 AM  3 years ago
InvertedDude

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Juan
JuanRodriguez Oh my !
Glad you finally found the real issue !!
It was a good learning experience! I am surprised that brushless motor gave up the magic white smoke! You should have seen me ripping stuff apart to access to lipo battery, I was gonna toss it!

Imagine the panic!

FIRE!!! OMG!!! NOOOO!!!!
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01-24-2018 03:07 AM  3 years ago
ICUR1-2

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It seems you're having quite the learning experience.
Now you're understanding the 100% rule. If it isn't 100% you can expect trouble.
A former flying buddy never learned this and eventually dropped out, It was hard watching someone who helped get me started, Crash as often as he did due to mechanical/electronic failures.
spending time, paying attention
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