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Home✈️Aircraft🚁Helicoptere-MikadoLogo 480 › 480 XXtreme on its way
04-09-2014 05:39 PM  5 years ago
soulrider911

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Novato Ca

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Here is some tests i did last night look at the results:

This is Idle up 2 with Tail blades attached:

This is Idle up 2 with NO Tail blades:
Why don't cats get gray hair with age?.....
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04-10-2014 02:45 PM  5 years ago
smittylube

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Santa Cruz, CA

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I agree with the quality of the kit and frames. The edged of the cf frames need no cleaning of the sharp edged because they did it already for us. Nice touch IMO.

As far as the vibes with the blades it is the tail blade causing the vibe. I use a piece of tape on one, try it then switch it. They suggest removing the control rod to avoid accidents during testing. It could be one grip somehow is different where the blade bolts in. Sometime swap blades in the grips as well, or another set of blades. You can easily get the tail below the yellow line.

This may fix it but might not
RPM is your friend..................................until you crash
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04-10-2014 05:41 PM  5 years ago
rexxigpilot

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It is likely the blades, not the grips. Otherwise this issue would be showing up on all the 480s. Since this heli came with the RotorTech tail blades instead of the Edge tail blades, I wonder if other who got the RotorTechs are having similar issue?
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04-10-2014 05:54 PM  5 years ago
soulrider911

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Novato Ca

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Hey Rexx that is exactly what i was thinking, i mean i have gon through this thing top to bottom at LEAST 5 times, it all point to the tail, and in my case the blades. And these helis just started coming with the rotortechs, i ordered a set of CY blades and will try them this weekend the Edge blades where out of stock, i really hope thats it, im about over it.Why don't cats get gray hair with age?.....
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04-10-2014 09:37 PM  5 years ago
kamaroman540

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Maple Shade N.J

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Edge 72
Yo soulrider911,i have three pairs of 72mm edges,u r more then welcome to try a pair pm and I will send them 2 ya
LOGO600SX LOGO400SE
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04-10-2014 11:06 PM  5 years ago
rexxigpilot

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good on ya kamaroman540!
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04-11-2014 01:44 PM  5 years ago
rcman

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Logan, Utah

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I'm running the new rotortech tail blades that come with the new kits and I have a perfect tail, no issues

Dave
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04-12-2014 01:41 AM  5 years ago
soulrider911

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Novato Ca

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Ok well it's not the tail blades , only thing I can think of now is the governor causing this some how, oh boyWhy don't cats get gray hair with age?.....
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04-12-2014 03:36 AM  5 years ago
BobOD

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New York- USA

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You mentioned that you tried disabling the gov before so not sure that'll do it. Might not be a bad idea to leave it disabled until you get this sorted though.
I notice there is a fairly strong harmonic at about 370hz. Does your problem happen at different head speeds?
Team POP Secret
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04-12-2014 06:17 AM  5 years ago
rexxigpilot

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367 Hz is the motor at 22,063 RPM. Since it is not the tail blades, the next thing to check for is a bent tail rotor shaft. What ever is causing the problem, your vibration analyzer has identified it as something that spins at tail rotor speed.
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04-12-2014 07:13 AM  5 years ago
BobOD

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Oh yeah, you're right. Looked like twice the tail rpm.Team POP Secret
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04-12-2014 07:18 AM  5 years ago
soulrider911

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Thanks for the reply just out of curiosity how can you that from the analyzer I just want to understand thanks!Why don't cats get gray hair with age?.....
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04-12-2014 07:21 AM  5 years ago
rexxigpilot

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Just multiply the Hz (cycles per second) value by 60 (60 seconds/minute) to get RPM. The analyzer labels the motor's sensor too.
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04-12-2014 04:26 PM  5 years ago
smittylube

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Santa Cruz, CA

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That's assuming the vibration is the cause. It still could something else, but regardless you want to fix the vibration or your tail bearings will not be happy real fastRPM is your friend..................................until you crash
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04-12-2014 07:05 PM  5 years ago
soulrider911

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Novato Ca

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So I just flew it with no vbar gov, still same issue, has to be either tail mechanical or software this is like the never ending story, Why don't cats get gray hair with age?.....
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04-12-2014 10:50 PM  5 years ago
BobOD

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New York- USA

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What caught my eye of that vibe analysis is that there is a spike almost exactly 2x the tail frequency. So, I looked at the gear ratios of this heli.
112T main / 23T Pinion - 9.22:1
42T pulley to 9T pulley - 4.67:1
The motor is turning very close to 2x the tail speed.
Here's the concern.
Motor RPM = 21225 (for 2300 HS)
Tail RPM = 10745
2x 10745 = 21490
21490-21225 = 265
265/60 = 4.4 hz
There is a beat frequency of 4.4 hz. This is so low a frequency that it is likely to be seen as movement rather than a vibration. It would be better to have this no less than 20hz.
There are only 2 other helis that I'm aware of that have a relationship like this. The Trex 700e Pro DFC and the Blade 130X.
Not sure if you want to go this far but you could try a different pinion and possibly a different kv motor to go with it. There are other ways to solve the problem, and this may not even be your particular problem but, just a concern I've seen before.
Team POP Secret
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04-13-2014 05:35 AM  5 years ago
soulrider911

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Novato Ca

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Dude another test today, flew with no gov and the gyro in rate mode, no wagging....? Checked the tail shaft it's straight, anyone want a brand new logo 480? I can't figure this out I have spent two weeks on this, really a bummer this is my first log and I was so excited about it, I no quitter, but comes a time when it's just time to hire in he towel Why don't cats get gray hair with age?.....
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04-13-2014 01:36 PM  5 years ago
Ronald Thomas

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Gainesville, Fl, USA

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Pm sent.Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!
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04-14-2014 06:53 PM  5 years ago
hemp

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Portland, OR - US

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Based on the vibe analysis I would suspect the motor.

Try putting a bit of tape on the motor (thin, spanned vertically) and see if the vibes change (better or worse.)

There are threads floating around regarding how to do precise motor balancing. At this point I'm just suggesting a quick, blunt technique to find out if it might be the problem, fixing it is a bit more involved.

Team MikadoUSA
Revolectrix Ambassador
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04-15-2014 06:09 AM  5 years ago
soulrider911

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Novato Ca

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Might have found the culprit, on the tail pitch slider??
So i was doing more tests (man i feel like a doctor on this thing), and i noticed something interesting... I think my tail pitch slider might be causing the problem here? Take a look at the attached video and watch the tail pitch slider closely... Notice it moving up and down and you can actually hear it as well if you listen close (checked the shaft it's straight). Now this is at very low rpm, but i image this just gets amplified at the rpms rise..., At which point to the naked eye appears to not vibrate, but i image its just happening so fast my eye cant atually pick up the movement??? Any thoughts in this???

Watch at YouTube

Why don't cats get gray hair with age?.....
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