REFLECTOR: Vibration.

Sat May 10 18:07:03 CDT 2014

Just for grins before you take off the blades.  Turn the indicator 90 
degrees and measure the crush plate.
I bet you see movement there that correlates to a thicker/thinner blade 
root.

On 05/10/2014 05:52 PM, nmflyer1 at aol.com wrote:
> Today's test: Put a dial indicator under the motor housing on the IVO. 
> There is some flex involved with tires, motor  mounts and such that 
> cause the indication when the blade is being moved, but each stopping 
> point was duplicated and steady. Light isn't great, so what you are 
> seeing is the "0" setting, and a total movement of about .038. Seems 
> like a LOT to me.
> Tried the square against the flange/motor housing and it is almost 
> perfect. There is one small area where I can just barely see light 
> under the motor housing side of the square, but nowhere near .038. 
> (didn't get out my feeler gauges)
> I ran out of time today as I had to come to work. I will pull the 
> blades tomorrow and measure the thickness of them in the hub area.
> Here's what I was seeing: http://www.youtube.com/watch?v=ypql4quEE-c
> I appreciate all your input. Just might get this figured out sooner 
> than later.
> Kurt
>
>
> -----Original Message-----
> From: Brian Michalk <michalk at awpi.com>
> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
> Sent: Fri, May 9, 2014 3:31 pm
> Subject: Re: REFLECTOR: Vibration.
>
> Another indication will be to get a right angle square and hold it up 
> against the crush plate to the pitch motor.  It should be 
> perpendicular all the way around.  If not, the acme screw will gall 
> against the crush plate, preventing you from getting full coarse or 
> full fine pitch.
>
> If you are having problems getting full throw on pitch, email me.  
> This is easily fixed without going through IVO.
>
> On 05/09/2014 09:21 AM, nmflyer1 at aol.com wrote:
>> That is some good info to have Brian. Thanks. I was wondering (just 
>> knowing my luck) if I had a bad blade or something. Might just buy 3 
>> new ones and swap out the whole mess. They really don't cost that much.
>> I appreciate the info!
>> Kurt
>>
>>
>> -----Original Message-----
>> From: Brian Michalk <michalk at awpi.com>
>> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
>> Sent: Fri, May 9, 2014 6:30 am
>> Subject: Re: REFLECTOR: Vibration.
>>
>> Mike Deeter had a blade tracking issue and vibration problem as well.
>>
>> In his door open event, a blade was damaged, which he replaced with a 
>> new one from IVO. IVO said it matched his other blades, but the 
>> problem was that the root thickness where it's clamped was thicker 
>> than the other two blades.  This puts the acme rod and motor in a 
>> bind and can lead to galling of the aluminum-steel bearing surfaces.
>>
>> We finally convinced IVO that this was a problem.  He sent back all 
>> three blades insisting that they make them the same.  I think IVO 
>> sent back three new blades.  The tracking and vibration problem went 
>> away.
>>
>> Mike's tracking error was on the order of .5" max.  Yours looks much 
>> worse.  You should easily be able to see some gaps in your warped 
>> crush plate.
>>
>> On 05/09/2014 12:18 AM, Kurt Winker wrote:
>>> Looking for input. Engine ran fine w-out the prop. Started it with 
>>> the prop....wicked vibration.
>>> Took prop off.. Vibration gone.
>>> Sent prop back to IVO....1-blade was 1-gram out of balance.  They 
>>> corrected & returned.
>>> Since I noticed that, when viewed from the side, the blade disk 
>>> tracking seemed to move for & aft when you looked at the top of the 
>>> disk.
>>> When I got the blades back, I reassembled & reinstalled. Then I 
>>> checked the blade tracking. Was off a tad, and I corrected that. 
>>> Also checked the blade angle with a protractor, and all seemed good.
>>> Looking for things to check.
>>> Engine: 4.3l- V6 90-degree engine...
>>> Belt drive reduction unit:  1.7:1 ratio.
>>> 76"- 3-blade.
>>>
>>> The fact that the blade track for-aft seems to change, really gets 
>>> my attention.
>>> Changing RPM doesn't help...the vibration increases in frequency 
>>> with rpm, but no better or worse.
>>> Changing the prop pitch has no effect.
>>>
>>> All else is well.... Hope I can figure this part out.
>>>
>>> View from the side: http://m.youtube.com/watch?v=Nr-KLXgco38.
>>>
>>>
>>> Kurt
>>>
>>> Sent from my iPad
>>>
>>>
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