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Old 02-10-2017, 10:08 AM   #1
JetFox
 
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Default Looking for DynaVibe in Phoenix

Anybody know who would loan a DynaVibe in the Phoenix area? Need a dynamic prop balance on a 912 UL Kitfox 4 wit Ivo prop.
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Old 04-10-2017, 09:40 AM   #2
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Default Re: Looking for DynaVibe in Phoenix

Just for your information, I could not find a loaner DynaVibe unit. I had no other choice than buy one. If somebody needs a loaner DynaVibe, let me know, I may be able to help.

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Peter Buehlmann
Kitfox 4-1200
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Old 04-10-2017, 10:26 AM   #3
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Default Re: Looking for DynaVibe in Phoenix

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Originally Posted by JetFox View Post
Just for your information, I could not find a loaner DynaVibe unit. I had no other choice than buy one. If somebody needs a loaner DynaVibe, let me know, I may be able to help.

Regards
Peter Buehlmann
Kitfox 4-1200
I'm curious, Peter. Do you have the little skull-cap spinner with your Ivo?
If you do, how will you add balance weights to the prop assembly? That's been the problem with the Ivo's that I've been asked to balance.
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Old 04-10-2017, 12:56 PM   #4
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Default Re: Looking for DynaVibe in Phoenix

The ivo in my opinion is one of the easiest props to static balance. There is a great You tube video on how to.
My ivo had a blade 11 grams lighter than the other two. I was able to get each blade static ,centroid and total weight balanced to within a fraction of a gram of each other by inserting a weight inside the torque tube at a predetermined point using a fibreglass rod to stop the weight migrating outwards.well worth trying As has been mentioned there is limited places to add weight externally.
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Old 04-10-2017, 06:36 PM   #5
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Default Re: Looking for DynaVibe in Phoenix

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The ivo in my opinion is one of the easiest props to static balance. There is a great You tube video on how to.
My ivo had a blade 11 grams lighter than the other two. I was able to get each blade static ,centroid and total weight balanced to within a fraction of a gram of each other by inserting a weight inside the torque tube at a predetermined point using a fibreglass rod to stop the weight migrating outwards.well worth trying As has been mentioned there is limited places to add weight externally.
I'm sure that's all true, Dusty, but doing a good dynamic balance job on an Ivo with the small spinner seems very difficult if not impossible for a guy with a DynaVibe or any dynamic balancer. I've very rarely seen a propeller that has been well-balanced statically that couldn't benefit (sometimes greatly) from a dynamic balancing job. Since the entire rotating assembly is being balanced, the needed weight is most often not even in line with the propeller blades. At least that's been my experience.
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Old 04-10-2017, 07:20 PM   #6
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Default Re: Looking for DynaVibe in Phoenix

I had a friend balance his IVO by adding layers of paint to the tips of the blades.
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Old 04-10-2017, 07:45 PM   #7
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Default Re: Looking for DynaVibe in Phoenix

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I had a friend balance his IVO by adding layers of paint to the tips of the blades.
Yeah... that's pretty standard practice when statically balancing a painted prop, when you get down to the nitty-gritty.
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Old 04-11-2017, 12:33 AM   #8
Dusty
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Default Re: Looking for DynaVibe in Phoenix

I agree John,a final rotational balance wouldn't do any harm as there are limited places for weights on a ivo hub and getting as close as possible before would minimise if not possibly eliminate any weights.
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Old 04-30-2017, 08:34 PM   #9
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Default Re: Looking for DynaVibe in Phoenix

jrevens, sorry for the delayed response...
I am still working on the prop balancing, what I can say is that I had to add quite a bit of weight. You asked where I put the weight. In my case I have long prop bolt which are sticking out of the back of the Rotax prop flange. I just added smaller and larger washers under the prop bolt nut. It worked fine for temporary trials. I may replace the washers with a fabricated weights. What I can say is, I was actually surprised how bad the prop balance was. I may go back and do a prefect static balance and then a dynamic balance again. I will update here again once I have more details.

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Peter Buehlmann
Kitfox4-1200 Rotax 80HP
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Old 05-13-2017, 08:59 PM   #10
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Default Re: Looking for DynaVibe in Phoenix

Here is an update from my balancing. I did remove all the added weights and measured again, just to prove that I am out of balance. All the numbers proofed it. Put the weights on again, the numbers came down again as before. I think I will stop now and fly for a while. Here are some stuff I learned:
-I needed to add approx 50 grams of weight to get a good dynamic balance.
- I did not do a static balance, will do it next time I remove prop
- There is no good balance trough the whole RPM range, I did the balance for my typical cruse RPM of 4800. I have higher vibration at around 3200 RPM compared to before I added the weights for a good balance at 4800.
- Changing in flight adjustable pitch changes balancing numbers too/
- Adding weights was easy on the back of the Rotax prop flange.

I came to the conclusion the the prop dynamic balance with Dyna Vibe help me to reduce the vibration, however I did not achieve a prefect numbers of 10 IPS or less through the whole RPM range. The lower the numbers you get, the harder it is to re-produce during the next test. I will do a balancing on a metal prop on a C145 next and see how Dyna Vibe works out there.

Regards
Peter Buehlmann
Kitfox4-1200 IVO prop inflight adjustable on Rotax 80HP
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