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Other › High Vibration Level alerts?
02-15-2011 01:47 AM  6 years agoPost 1
Anthony.LrrElite Veteran - Seattle, WA - My Posts: All  Forum  Topic

I've got 5 flights now on my recent Logo 500SE build. The other day I was poking around in the Vstabi software and clicked on the log viewer. I noticed on the last flight the Vbar was complaining about vibrations basically every 10 seconds (polling interval?) for the entire length of the flight.

Are these somewhat normal levels, or alarming levels that I should start investigating the source of the vibrations? Since this is my first Logo and Vbar I have no benchmark on where it should be.

In flight I don't notice or hear any vibrations that are alarming to me in my experience.

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02-15-2011 02:51 AM  6 years agoPost 2
Jesse Kavros

rrApprentice

San Jose, California

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Depending on how you fly you will always see some sort of vibration alert. If you fly hard 3d, expect to see it a lot, sport flying you will see it every once in a while. But yes its normal . Atleast thats what I have noticed anyways.

Mikado
Scorpion
OptiPower
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02-15-2011 03:10 AM  6 years agoPost 3
Anthony.L

rrElite Veteran

Seattle, WA

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It was a hard 3d flight. I guess what I will to do so I can prove that theory is go out and hover for a couple minutes then come back and check the logs. If the vibration alerts are gone, or at least considerly less, then I will just assume its just me ringing her out!

Thanks Jesse!

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02-15-2011 03:13 AM  6 years agoPost 4
helicraze

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Victoria - Australia

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I would be concerned if you were hovering only and it came up. I understand that when finding vibes just hover the heli and see the result

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02-15-2011 03:13 AM  6 years agoPost 5
Smacka

rrApprentice

PA

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I have a question/observation with respect the V-Bar vibe spectrum feature...

I have noticed that many pilots have been chasing vibes, trying to all but eliminate them. Here is my thinking...

Did V-Bar create a "monster"? I wonder how many helicopters would fly for many years without alarming its pilot with strange tendencies and/or behaviors had they not had access to the vibe spectrum feature (data logging vibes)?

Could it be that V-Bar placed a tool in our hands that is too sophisticated for its own good? I wonder how accurate this feature is to begin with, and if these vibe levels ARE what they seem to be.

Seems to me that pilots used to be able to find bad vibes and correct them long before this feature became available.

Just a thought

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02-15-2011 03:28 AM  6 years agoPost 6
helicraze

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Victoria - Australia

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The way i see it if the vibe is bad you will see in flight as it will drift etc.

Personally I don't EVER look at the log.

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02-15-2011 03:30 AM  6 years agoPost 7
OICU812

rrMaster

Edson, Alberta,​Canada

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In flight yea that is NO BIGGIE at all, as said in hover and or on rug for example, then you should be concerned.

...Once upon a time there were Nitros, flybars and frequency pins...

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02-15-2011 04:14 AM  6 years agoPost 8
Anthony.L

rrElite Veteran

Seattle, WA

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Thanks guys! I will still do the hover test and check the log just to put my mind at ease.

Smacka, I was thinking the same thing and partially why I created this thread. As I mentioned, in flight I don't see or hear any vibrations. With any other heli I would not have thought twice and continued to fly it happily. However with the Vbar since I have this nifty event log now I'm questioning how well the heli is performing.

In other words, it seems I'm on a wild goose chase!

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02-15-2011 04:16 AM  6 years agoPost 9
helicraze

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Victoria - Australia

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Yes, chasing your tail so to speak

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02-15-2011 04:26 AM  6 years agoPost 10
Anthony.L

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Seattle, WA

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Well if anything this will serve as good info for anyone else in search of a similar question!

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02-15-2011 04:28 AM  6 years agoPost 11
Smacka

rrApprentice

PA

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I hear you...I am still fence sitting on that vibe feature. I absolutely want V-Bar to continue forward strides, and they have a fantastic product. I am going to read this thread closely and see what experiences are flushed out from other pilots.

As good pilots, we still need need to use all of our other senses and not rely solely on our eyes (to read log sheets). Let's not lose the power of discernment, and our critical "eye" when it comes to our heli's

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02-15-2011 08:59 AM  6 years agoPost 12
MrMel

rrProfessor

Gotland

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On electrics;

If you have Raised/High every 10 seconds, even in hover, you have vibration problems.

In Hover you should have green entries only.

In 3D flight however, it's a totally different story, even a simple roll can cause extreme vibrations.

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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02-15-2011 09:08 AM  6 years agoPost 13
Anthony.L

rrElite Veteran

Seattle, WA

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Thanks Mel! Soon as the rain stops I'll be doing a hover flight and posting the results, very curious to see!

It's going to be really hard to do nothing but hover for a couple minutes. This Logo Vbar just begs to be flogged! On the maiden flight I think I hovered for maybe 20 seconds checking the tail and then gave into the 3d monster.

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02-15-2011 07:23 PM  6 years agoPost 14
Andy from Sandy

rrElite Veteran

Bedfordshire, UK

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For me I used the spectrum analyser and found a big vibration at tail rotor speed. It turned out one of the grips was locking up under load.

You can use the spectrum analyser to check if you have the pinion to main gear set optimally as well.

It is a good feature IMO.

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02-15-2011 09:10 PM  6 years agoPost 15
Anthony.L

rrElite Veteran

Seattle, WA

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Ok, so I've seen the spectrum analyzer but have not used it yet.

So, if I understand correctly, you connect the Vbar to the Vstabi software on the bench. Remove the main and tail blades. Then spool up the heli on the bench and watch the analyzer looking for vibrations? The analyzer will tell you at what frequency the vibrations are which tells you if the problem is in the head, gear mesh, or tail?

I've built several helicopters and very confident in my building skills for things like the head and tail. However one thing that is completely new to me with this Logo is setting proper gear mesh with herringbone gears. Now I've read the manual, read countless threads online, and did some trial and error on my part. I think I've got it set good, but would love if the analyzer would tell me otherwise.

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02-15-2011 09:11 PM  6 years agoPost 16
helicraze

rrElite Veteran

Victoria - Australia

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Just hover it outside then plug it into the PC, upload the log and have a look.

Not always about building skills, a lot of the times things can be worn and you don't know

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02-15-2011 09:13 PM  6 years agoPost 17
Anthony.L

rrElite Veteran

Seattle, WA

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Ok, so I thought the spectrum analyzer was real time only, but instead it's a saved log like the event messages I posted above that I can review after the flight?

I will give it a shot on the next flight, only if it will stop raining in the PNW for 5 mins.

P.S. My logo is brand new, 5 flights total on the airframe. I highly doubt I have any worn parts yet.

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02-15-2011 09:18 PM  6 years agoPost 18
MrMel

rrProfessor

Gotland

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Spectrum analyzer is real time only, it wont be logged.

http://www.youtube.com/watch?v=4fe8rFxQcD8

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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02-15-2011 09:34 PM  6 years agoPost 19
Anthony.L

rrElite Veteran

Seattle, WA

My Posts: All  Forum  Topic

Thanks MrMel, I had skimmed your video previously and that was the assumption I was working off.

I'll run the analyzer live on the bench, and report my findings.

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