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slyck(at)frontiernet.net
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 Posted: Fri Sep 07, 2007 8:01 am Post subject: buzzing vibration |
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I went out for a sundown ride last night. Calm on the ground, enough
breeze at pattern altitude for a good crosswind crab, but still smooth.
Being too lazy lately to replace a lost pitot cover, the bugs plugged
that thing. So all my performance numbers were nonexistent.
(although zero mph climb speeds are pretty impressive)
Question is this: in bumpy air I get an intermittent buzzing
effect. Maybe a vibration, maybe only a sound effect. Generally only
when running full cruise above 4700 rpm. It isn't the ailerons
because I KNOW what they do from experience (still got to
move those balancers from the shelf to the wings)
My thinking is that it has something to do with the relationship
between my prop and bump-induced yaw. The sideways
moving prop biting the air unevenly. 3 blade powerfin. Anyone else
experience a similar effect?
BB
MkIIIc, suzuki
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jbhart(at)onlyinternet.ne
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| Posted: Fri Sep 07, 2007 10:05 am Post subject: buzzing vibration |
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Bob,
Might be a aileron gap seal or center section leak. On my FireFly, I ran
the gap seals the whole way to the pivot arm. The propeller wash wore them
out in the creases and so finally, I removed that portion of the gap seal.
They used to sing like blowing by a blade of grass held between your thumbs
etc.
Jack B. Hart FF004
Winchester, IN
At 11:59 AM 9/7/07 -0400, you wrote:
| Quote: |
I went out for a sundown ride last night. Calm on the ground, enough
breeze at pattern altitude for a good crosswind crab, but still smooth.
Being too lazy lately to replace a lost pitot cover, the bugs plugged
that thing. So all my performance numbers were nonexistent.
(although zero mph climb speeds are pretty impressive)
Question is this: in bumpy air I get an intermittent buzzing
effect. Maybe a vibration, maybe only a sound effect. Generally only
when running full cruise above 4700 rpm. It isn't the ailerons
because I KNOW what they do from experience (still got to
move those balancers from the shelf to the wings)
My thinking is that it has something to do with the relationship
between my prop and bump-induced yaw. The sideways
moving prop biting the air unevenly. 3 blade powerfin. Anyone else
experience a similar effect?
BB
MkIIIc, suzuki
|
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Steven Green
Joined: 05 Feb 2006
Posts: 118
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| Posted: Fri Sep 07, 2007 5:11 pm Post subject: buzzing vibration |
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I had a buzzing sound in my MK3 that was coming from a piece of lexan on the
center section overhead. It too was intermittent.
Steven
| Quote: |
I went out for a sundown ride last night. Calm on the ground, enough
breeze at pattern altitude for a good crosswind crab, but still smooth.
Being too lazy lately to replace a lost pitot cover, the bugs plugged
that thing. So all my performance numbers were nonexistent.
(although zero mph climb speeds are pretty impressive)
Question is this: in bumpy air I get an intermittent buzzing effect.
Maybe a vibration, maybe only a sound effect. Generally only
when running full cruise above 4700 rpm. It isn't the ailerons because I
KNOW what they do from experience (still got to
move those balancers from the shelf to the wings)
My thinking is that it has something to do with the relationship between
my prop and bump-induced yaw. The sideways
moving prop biting the air unevenly. 3 blade powerfin. Anyone else
experience a similar effect?
BB
MkIIIc, suzuki
|
| | - The Matronics Kolb-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Kolb-List |
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_________________
Steven Green |
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