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Old 05-13-2017, 09:49 PM   #11
jrevens
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Default Re: Looking for DynaVibe in Phoenix

Quote:
Originally Posted by JetFox View Post
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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
Hey Peter,

I don't want to discourage you, but 10 ips would represent a lot of vibration. That would be a very high number. When I balance a prop, I aim for a velocity of less than .05 ips. If it's not just a simple out of balance propeller situation - for instance if you have something loose, or a gearbox or engine problem - it will be hard or impossible to balance the prop. It will be interesting to see what results you get with the C145.
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Old 10-13-2017, 10:17 PM   #12
JetFox
 
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Default Re: Looking for DynaVibe in Phoenix

Hi John, after a hot summer in Arizona I am back in the hangar. Yes you are right, 10 ips is not a good number. This was a typo, I tried to achieve 0.10 ips. I did get 0.10 and below but not through the whole RPM range. I balanced for around 4800 RPM and I got it down there to 0.09 to 0.05 ips. I am still wondering why I do not have an equal result through the whole RPM range as the prob balance should stay the same in regards to weight distribution over the prop. I have to assume that engine vibration on different RPM influenced the prop balance result. Anyway, I have a much smoother ride around my cruising RPM of 4800. The vibration around 3200 just after pulling the power on a final has significantly increased. However this is just for a short time on final. I am happy the way it is now.
I have not done the C145 yet, will report back later.
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Old 10-14-2017, 02:47 PM   #13
n85ae
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Default Re: Looking for DynaVibe in Phoenix

Try clocking the prop differently. What I mean by that is rotate it one set of
bolt holes and try again. That can make a huge difference.

Jeff

Quote:
Originally Posted by JetFox View Post
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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Old 11-01-2017, 07:54 PM   #14
JetFox
 
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Location: Phoenix Arizona
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Default Re: Looking for DynaVibe in Phoenix

Jeff, I will give it a try next time I remove the prop.
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Old 02-13-2018, 07:33 PM   #15
Delta Whisky
 
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Default Re: Looking for DynaVibe in Phoenix

Peter not that I've ever jumped in to a fun task without double checking the basics - but - did you check the prop track? That will create the condition you're describing.
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Old 02-15-2018, 09:05 PM   #16
JetFox
 
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Default Re: Looking for DynaVibe in Phoenix

Delta Whisky, no I did not check the track of the prop blades. I did not consider it as important as these blades are very flexible (Ivo Prop). I did it on metal props on other planes. Well this is a good input and easy to do. Currently the prop is off, will check it once it is back on. Will report on the findings, thanks for the hint.
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