Today's Message Index:
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1. 12:29 AM - Re: Propeller? Gearbox? "Wow-wow-wow" resonance (Remi Guerner)
2. 04:14 AM - Biax Material for Europa classic wing (TobiK)
3. 04:40 AM - West Systems for wing filling ?? (Tony Renshaw)
4. 05:12 AM - Re: Propeller? Gearbox? "Wow-wow-wow" resonance (SPURPURA)
5. 05:43 AM - Re: Biax Material for Europa classic wing (spcialeffects)
6. 05:45 AM - Re: West Systems for wing filling ?? (spcialeffects)
7. 06:58 AM - Re: Propeller? Gearbox? "Wow-wow-wow" resonance (clivesutton)
Message 1
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| Subject: | Re: Propeller? Gearbox? "Wow-wow-wow" resonance |
Jonathan,
I do not think your gearbox could cause your problem. The cause may be a bug in
the propeller controller. I would ask Airmaster for advice.
Good luck
Remi
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http://forums.matronics.com/viewtopic.php?p=496919#496919
Message 2
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| Subject: | Biax Material for Europa classic wing |
Hey Guys,
I am actually building an Europa classic (blue foam) Wing. I am running out of
material (biax cloth) and I would now like to buy some new. The problem is, I
don't know what material the "biax" is. Does anyone of you can help me with a
specification or typ of cloth?
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http://forums.matronics.com/viewtopic.php?p=496922#496922
Message 3
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| Subject: | West Systems for wing filling ?? |
Gidday,
Over time I have found exposure to Ampreg products gave me flu type symptoms for
a couple of days after use, so I have migrated to the West Systems 105/106 Resin/Hardner
combination, with far less issues. I am wondering if others have
used it for filling their aircraft, whether it sands well, or whether I should
consider something else? I think at this stage Ill keep to an epoxy based filler,
unless I get a compelling argument to use something else. Hoping to get some
pearls of wisdom.... thanks in advance.
Regards
Tony Renshaw
Message 4
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| Subject: | Re: Propeller? Gearbox? "Wow-wow-wow" resonance |
Doubt that its propeller related. Try a stethoscope. If you have 600 hours on it,
you may be ready for some gear box service. I had 700 hours on mine before
getting rebuilt.Dont let it go too long as it is full of expensive parts.
--------
N951EU - Tri-gear & 912ULS, N77EU- Mono & 914
I'D RATHER HAVE A BOTTLE IN FRONT OF ME THAN A FRONTAL LABOTAMY.
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http://forums.matronics.com/viewtopic.php?p=496924#496924
Message 5
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| Subject: | Re: Biax Material for Europa classic wing |
Hi TobiK. I too built a classic but didn't have the biax cloth. I spoke with Andy
D and he told me the very early kits (first 12 or so) used 2 layers of uni.
When i was looking for the Biax cloth ito couldn't get the exact specs not even
from the LAA.
Good Luck
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http://forums.matronics.com/viewtopic.php?p=496926#496926
Message 6
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| Subject: | Re: West Systems for wing filling ?? |
Yes i to used the west system for the filling stage on the recommendation from
Neville E, It sands much better then the ampreg.
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http://forums.matronics.com/viewtopic.php?p=496927#496927
Message 7
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| Subject: | Re: Propeller? Gearbox? "Wow-wow-wow" resonance |
Hi Jonathan, what you describe is 'Heterodyning' or 'Beat-frequency' created by
the difference between two noise or vibration frequencies very close together.
Do you have a recording on e.g. a mobile phone that i could listen to - along with
the engine speeds in play at the time? And what about:-
1) How the frequency of 'wow-wow' change if you speed up or slow down the engine
a bit?
2) How does the 'wow-wow' effect change with Airspeed?
3) the CS mode idea is viable too - does it occur when that is turned off/the prop
is not trying to hunt for optimum speed vs pitch?
It's impossible to say from just the description given, but assuming the above
items make a significant difference, my initial suspicions would be one prop blade
with a slightly different prop pitch to the others and/or blade tip tracking
differences between blades. Both of those parameters should be quite easy
to check on the ground (no engine running needed) and reporting any variation
you find?
Clive
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http://forums.matronics.com/viewtopic.php?p=496930#496930
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