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Home✈️Aircraft🚁Helicoptere-MikadoLogo 500 › Vbar analyser and Kontronik help
04-09-2013 08:14 PM  7 years ago
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v58 fuy

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Vbar analyser and Kontronik help
Guys,

I have the typical Logo 500se combo, you know mini vbar, 4025-1100 and Kontronik 100LV.

Yesterday I replaced the bearings in my motor, so when re-assembling thought I'd run the vibration analyser, with interesting results.

When powering up the heli, I simply engaged idle up 1, which normally is 70% throttle with governor on.

Anyway,

Motor only with pinion not engaged - 25
Motor engaged with main gear, no tail blades - 120
As above but with tail blades added - 1200 (@ 19,500rpm)
Swap tail blades over - 790 (@ 19,500)
-—------------------------------------------------
Now my two questions:

1) in normal use the head is governed to about 2000rpm and therefore the tail vibe should have been around 9000 not 19500rpm - this I think must be due to the governor being able to produce higher rpm without the main blades on the heli?

2) Is 790 on the vibration analyser ok, will it likely be a lot lower at 9000rpm?

David
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04-10-2013 08:31 PM  7 years ago
smittylube

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Not good. I had about 25 on my 600 with tail blades.

First you have something wrong if it is that high no blades, you can try removing the tail hub and see if that helps. Like you did systematically is how you isolate problems. I put tape on my tail blades and had almost no vibes reach the frame. The plastic frames are excellent to dampen vibration, however if you have too much you will shorten the bearing life- so worth sorting it out.

Some have commented on removing some flashing on the tail blade grips. Dont know if if it was rubbing on the hub or not letting the bearing seat entirely, but might be where you start. No blades you should not feel much of anything.

Max vibes is 325 or 390.. Look for the yellow line in the graph. it stays there. that is the point where the sensor has to weed out the vibes and effects the vbar performance (At least how I understand it)

Good luck
RPM is your friend..................................until you crash
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04-10-2013 08:32 PM  7 years ago
smittylube

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Oh if you mouse over the peak it tells you roughly the rpm. First one is the mains, then the tail, then the motor from what I understand.RPM is your friend..................................until you crash
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04-10-2013 08:35 PM  7 years ago
smittylube

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No wait- motor..

KV 1100 x 25 volts (6s)= 27500 x 70% = 19250

Bingo - motor is probably the problem
RPM is your friend..................................until you crash
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04-10-2013 10:47 PM  7 years ago
v58 fuy

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Did some re-runs of the vibe test today, ran it on a straight throttle curve without governor.

With tail blades at 75% throttle the max was about 460 (yellow line is at 350) - this was registering at about 9850 rpm so it s definitely the tail blades.

When the tail blades are off, the max reading is under 100 - so am going to try an balance the tail blades, and take grips apart to check and re- grease everything.

Some additional points I'm interested to know, does anybody lube the belt, and/or the pinion? Also are there any other recommended mounting pads for the mini vbar which might help - what about the old pad / metal plate / pad trick we used to use on gyros that acted up?

David
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04-10-2013 11:37 PM  7 years ago
BobOD

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what about the old pad / metal plate / pad trick
On the new full size...no
On the mini...maybe
Team POP Secret
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04-11-2013 05:38 AM  7 years ago
smittylube

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I found tape at your flying rpm the best way to balance the blades. This can help other things that may be slightly off as well. Each time I've tried to static balance I could do better mounted and spooled up. Just be super careful.

Use the Bluetooth to balance mains, but have not had enough help to do it much.
RPM is your friend..................................until you crash
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04-12-2013 10:44 PM  7 years ago
Andy from Sandy

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I played around with tape on the tail blades until I got a reading below 100 on my Logo 500.

It takes a few goes to see what is making things good and what isn't. Then you play chicken and decide if you should have one more go at getting a lower reading.
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04-13-2013 10:46 PM  7 years ago
v58 fuy

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I found my gear mesh was too tight, and backing it off has reduced things a lot - now with tail blades fitted I'm getting around 180 which is a big improvement ( may try the tape trick now, or settle on it ).

David
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04-14-2013 04:04 PM  7 years ago
smittylube

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Take the time to try tape. You will be amazed at how smooth it can be. Find the light side by adding the tape. Sometimes it needs to be closer to the grips and more tape or slightly less out further towards the tip. Use the analyzer to verify, but just feeling the boom and frame with your fingers you can tell when you're there.RPM is your friend..................................until you crash
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04-14-2013 05:37 PM  7 years ago
v58 fuy

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Did some playing with tape today, got it down to around 120 with tail blades on, which considering it was 1200 last Thursday before I started with my testing - pretty impressed.

David
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06-17-2013 08:47 PM  7 years ago
Andy from Sandy

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Just coming back to an early post
Did some re-runs of the vibe test today, ran it on a straight throttle curve without governor.
Did you re-program the Jive or did you have it in Mode 4 or Mode 11? If either is set then it is in a governed mode.
Did some playing with tape today, got it down to around 120 with tail blades on.
Your Logo will thank you for the effort by flying nice and smooth now!
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06-17-2013 09:28 PM  7 years ago
smittylube

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Very confusing at first, totally understandable after you play around a bit.

I totally agree with Sandy from Andy

Your tail bearings will now hold together 10 times longer. And you can sleep better too.
RPM is your friend..................................until you crash
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