The Murphy Builders Site

Last week, flying with my wife aboard, we encountered a light gust
(which my wife did not notice) which was either caused by or was the
cause of the onset of a fairly loud vibration noise. This noise seemed
to emanate from the rear of the aircraft, and was loud enough to make me
decide to land urgently which I did.

The noise sounded like a very rapid oil-canning. ie: the sound of a
piece of sheet metal flexing rapidly as a result of stimulation by the
wind. It does not appear to be a control surface because I feel nothing
in any of the controls. The noise in subsequent tests shows up at 60 mph
IAS (approx) and seems fairly constant regardless of airspeed, rpm or
other stimulations.

Nothing was changed in the past 12 hours of operation prior to the onset
of this noise. Earlier the floats had been put back on replacing the
wheels. I have spent considerable effort chasing this unnerving
phenomena. Has anyone else any similar experience and recommendations?

Garry
068R

Last week, flying with my wife aboard, we encountered a light gust
(which my wife did not notice) which was either caused by or was the
cause of the onset of a fairly loud vibration noise. This noise seemed
to emanate from the rear of the aircraft, and was loud enough to make me
decide to land urgently which I did.

The noise sounded like a very rapid oil-canning. ie: the sound of a
piece of sheet metal flexing rapidly as a result of stimulation by the
wind. It does not appear to be a control surface because I feel nothing
in any of the controls. The noise in subsequent tests shows up at 60 mph
IAS (approx) and seems fairly constant regardless of airspeed, rpm or
other stimulations.

Nothing was changed in the past 12 hours of operation prior to the onset
of this noise. Earlier the floats had been put back on replacing the
wheels. I have spent considerable effort chasing this unnerving
phenomena. Has anyone else any similar experience and recommendations?

Garry
068R



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Last week, flying with my wife aboard, we encountered a light gust
(which my wife did not notice) which was either caused by or was the
cause of the onset of a fairly loud vibration noise. This noise seemed
to emanate from the rear of the aircraft, and was loud enough to make me
decide to land urgently which I did.

The noise sounded like a very rapid oil-canning. ie: the sound of a
piece of sheet metal flexing rapidly as a result of stimulation by the
wind. It does not appear to be a control surface because I feel nothing
in any of the controls. The noise in subsequent tests shows up at 60 mph
IAS (approx) and seems fairly constant regardless of airspeed, rpm or
other stimulations.

Nothing was changed in the past 12 hours of operation prior to the onset
of this noise. Earlier the floats had been put back on replacing the
wheels. I have spent considerable effort chasing this unnerving
phenomena. Has anyone else any similar experience and recommendations?

Garry
068R

You probably already did it but for giggles I'd also grab all the
control surfaces to check for bearing play and also for up down movement
of the stab at the tips and at the fuselage forward mount. Some Rebels
have more free play in the stabilizer struts than I like.
Ken


Garry wrote:

Last week, flying with my wife aboard, we encountered a light gust
(which my wife did not notice) which was either caused by or was the
cause of the onset of a fairly loud vibration noise. This noise seemed
to emanate from the rear of the aircraft, and was loud enough to make me
decide to land urgently which I did.

The noise sounded like a very rapid oil-canning. ie: the sound of a
piece of sheet metal flexing rapidly as a result of stimulation by the
wind. It does not appear to be a control surface because I feel nothing
in any of the controls. The noise in subsequent tests shows up at 60 mph
IAS (approx) and seems fairly constant regardless of airspeed, rpm or
other stimulations.

Nothing was changed in the past 12 hours of operation prior to the onset
of this noise. Earlier the floats had been put back on replacing the
wheels. I have spent considerable effort chasing this unnerving
phenomena. Has anyone else any similar experience and recommendations?

Garry
068R

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I had a rapid tapping/ light banging noise on take off one day and landed
quickly because it was unusual - Peter eventually found it ...it turned out
to be the end of a piece of rubber trim that had come out from under the
wing root faring and it was slapping on the fuselage.

It happened again a few months later (because I keep forgetting to glue it
down) Tom, Peter, and I now refer to it as the "French River Flap".
Good luck

Jim R333




On 8/8/2008 11:25 PM, "Garry" <wright.garry30@gmail.com> wrote:

Last week, flying with my wife aboard, we encountered a light gust
(which my wife did not notice) which was either caused by or was the
cause of the onset of a fairly loud vibration noise. This noise seemed
to emanate from the rear of the aircraft, and was loud enough to make me
decide to land urgently which I did.

The noise sounded like a very rapid oil-canning. ie: the sound of a
piece of sheet metal flexing rapidly as a result of stimulation by the
wind. It does not appear to be a control surface because I feel nothing
in any of the controls. The noise in subsequent tests shows up at 60 mph
IAS (approx) and seems fairly constant regardless of airspeed, rpm or
other stimulations.

Nothing was changed in the past 12 hours of operation prior to the onset
of this noise. Earlier the floats had been put back on replacing the
wheels. I have spent considerable effort chasing this unnerving
phenomena. Has anyone else any similar experience and recommendations?

Garry
068R



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Hmmmm...... might be missing a screw on one of the tail
fairings, or wing fairings, ... or a bit of loose rubber edging ???

How about slack in the water rudder cables allowing
them to hit the float ?? .... or slack in the X brace wires ?
... or brake line tubing ...

I had a piece of rubber edging come out at the front
of the wing root fairings on FOKM - sounded like the
engine was about to throw a rod !! It was beating on the
top of the wing ... turned back & landed at Chilliwack ASAP !!

Time for a real close inspection - look for wear from
moving fairings or cables ....

Thanks Jim. That was the first thing I thought of after getting on the
ground. Unfortunately that was not it(at least the one I thought it
might be). One thing though, is the rubber on the lower fairing on one
of the elevators has disappeared. Could be that fairing thrashing around
I suppose and the rubber may have fallen off in mid-flight, which would
explain the sudden onset. I will try to get some replacement rubber. Any
idea on sources?

Garry

Jim Cole wrote:

I had a rapid tapping/ light banging noise on take off one day and landed
quickly because it was unusual - Peter eventually found it ...it turned out
to be the end of a piece of rubber trim that had come out from under the
wing root faring and it was slapping on the fuselage.

It happened again a few months later (because I keep forgetting to glue it
down) Tom, Peter, and I now refer to it as the "French River Flap".
Good luck

Jim R333




On 8/8/2008 11:25 PM, "Garry" <wright.garry30@gmail.com> wrote:

Last week, flying with my wife aboard, we encountered a light gust
(which my wife did not notice) which was either caused by or was the
cause of the onset of a fairly loud vibration noise. This noise seemed
to emanate from the rear of the aircraft, and was loud enough to make me
decide to land urgently which I did.

The noise sounded like a very rapid oil-canning. ie: the sound of a
piece of sheet metal flexing rapidly as a result of stimulation by the
wind. It does not appear to be a control surface because I feel nothing
in any of the controls. The noise in subsequent tests shows up at 60 mph
IAS (approx) and seems fairly constant regardless of airspeed, rpm or
other stimulations.

Nothing was changed in the past 12 hours of operation prior to the onset
of this noise. Earlier the floats had been put back on replacing the
wheels. I have spent considerable effort chasing this unnerving
phenomena. Has anyone else any similar experience and recommendations?

Garry
068R



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Aircraft Spruce has quite a collection in their catalog - What width are you
looking for to match the other trim?

Jim

On 8/9/2008 10:35 AM, "Garry" <wright.garry30@gmail.com> wrote:

Thanks Jim. That was the first thing I thought of after getting on the
ground. Unfortunately that was not it(at least the one I thought it
might be). One thing though, is the rubber on the lower fairing on one
of the elevators has disappeared. Could be that fairing thrashing around
I suppose and the rubber may have fallen off in mid-flight, which would
explain the sudden onset. I will try to get some replacement rubber. Any
idea on sources?

Garry

Jim Cole wrote:

I had a rapid tapping/ light banging noise on take off one day and landed
quickly because it was unusual - Peter eventually found it ...it turned out
to be the end of a piece of rubber trim that had come out from under the
wing root faring and it was slapping on the fuselage.

It happened again a few months later (because I keep forgetting to glue it
down) Tom, Peter, and I now refer to it as the "French River Flap".
Good luck

Jim R333




On 8/8/2008 11:25 PM, "Garry" <wright.garry30@gmail.com> wrote:



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Can you suggest any other source?

Garry

FWIW, Wicks (http://www.wicksaircraft.com/) also has a selection of rubber
edging. Good luck.

Ron

Can you suggest any other source?

Garry

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Thanks Ron. What did you search their site for when you looked - I can't
seem to find it.

G

Ron Shannon wrote:

FWIW, Wicks (http://www.wicksaircraft.com/) also has a selection of

rubber

edging. Good luck.

Ron

Its 3/8" stuff Jim. Speaking of ACS

Start of Rant!

When ACS opened in Toronto it was a boon for Ontario folks I think. But
we in the west got royally shafted. For me to buy 1" of this trim from
ACS would require a $50 shipping bill from ACS. It is cheaper to have it
shipped by air from the California outlet than from TO. Not only that,
they only accept returns from Canada via TO and then lose them in the
return process - even when they were purchased from the US in US$ on US
credit cards. Nice huh. I buy from them in the US but never when in
Canada any more. In other words I very much feel cut off from a sensible
supply source in the summer when in Canada. And it goes way beyond this
description.

End Rant!

Sorry about that - I usually don't rant but this one was well earned by
ACSTO for the last run around I got from them.
Can you suggest any other source?

Garry

Jim Cole wrote:

Aircraft Spruce has quite a collection in their catalog - What width are you
looking for to match the other trim?

Jim

On 8/9/2008 10:35 AM, "Garry" <wright.garry30@gmail.com> wrote:

Thanks Jim. That was the first thing I thought of after getting on the
ground. Unfortunately that was not it(at least the one I thought it
might be). One thing though, is the rubber on the lower fairing on one
of the elevators has disappeared. Could be that fairing thrashing around
I suppose and the rubber may have fallen off in mid-flight, which would
explain the sudden onset. I will try to get some replacement rubber. Any
idea on sources?

Garry

Jim Cole wrote:
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Garry

Do you know about Spaenaur in Kitchener? Thay probably have something that would
do the trick, Quickedge might be it
http://www.spaenaur.com/products.asp?PageID=K.

Cheers,

Dave
elite583.cjb.net



Garry wrote:

Its 3/8" stuff Jim. Speaking of ACS

Start of Rant!

When ACS opened in Toronto it was a boon for Ontario folks I think. But
we in the west got royally shafted. For me to buy 1" of this trim from
ACS would require a $50 shipping bill from ACS. It is cheaper to have it
shipped by air from the California outlet than from TO. Not only that,
they only accept returns from Canada via TO and then lose them in the
return process - even when they were purchased from the US in US$ on US
credit cards. Nice huh. I buy from them in the US but never when in
Canada any more. In other words I very much feel cut off from a sensible
supply source in the summer when in Canada. And it goes way beyond this
description.

End Rant!

Sorry about that - I usually don't rant but this one was well earned by
ACSTO for the last run around I got from them.
Can you suggest any other source?

Garry

Jim Cole wrote:

Aircraft Spruce has quite a collection in their catalog - What width are you
looking for to match the other trim?

Jim

On 8/9/2008 10:35 AM, "Garry" <wright.garry30@gmail.com> wrote:



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--
David A. Ricker
Fall River, Nova Scotia
Canada






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