Today's Message Index:
----------------------
1. 11:36 AM - M14P sound during flight. (Sylvain April)
2. 02:08 PM - Re: M14P sound during flight. ()
3. 04:40 PM - Re: M14P sound during flight. (Bill)
4. 04:46 PM - Re: M14P sound during flight. (Mark Pennington)
Message 1
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| Subject: | M14P sound during flight. |
Hi all,
I need your experience on the M14P. I am flying a Murphy Moose with a M14P
400HP engine spinning a MTV9 propeller.The airplane is on amphib floats.
The engine runs OK with all the parameters in the green. But the engine mak
e an unusual noise when we are in flight, it makes a kind of RAA_ RAA_ RAA
with a period of about 2 seconds. At 1840 RPM it is very noticable at 2000
RPM it is louder, this noise can also be felt as a vibration in the floor
of the airplane. The prop check OK no loose blade or damage, it perform nor
mally, The RPM is constant no variation seen on an 3 1/8=92=92 analog gauge
. We can not find anything loose on the airplane, The cowling is solid, the
float guide wire are tight.
Any idea what can cause this noise, it really seems to come from the engine
.
Thanks
Sylvain April
Envoy=E9 =E0 partir de Courrier<https://go.microsoft.com/fwlink/?LinkId=5
50986> pour Windows
Message 2
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| Subject: | M14P sound during flight. |
I apologize for stating the obvious, but this has the feel of a prop
being
out of balance.
r/
Mark Bitterlich
Yak-50 N50YK
From: owner-m14pengines-list-server@matronics.com
<owner-m14pengines-list-server@matronics.com> On Behalf Of Sylvain April
Sent: Wednesday, September 28, 2022 2:36 PM
Subject: M14PEngines-List: M14P sound during flight.
Hi all,
I need your experience on the M14P. I am flying a Murphy Moose with a
M14P
400HP engine spinning a MTV9 propeller.The airplane is on amphib floats.
The engine runs OK with all the parameters in the green. But the engine
make
an unusual noise when we are in flight, it makes a kind of RAA_ RAA_ RAA
with a period of about 2 seconds. At 1840 RPM it is very noticable at
2000
RPM it is louder, this noise can also be felt as a vibration in the
floor of
the airplane. The prop check OK no loose blade or damage, it perform
normally, The RPM is constant no variation seen on an 3 1/8=92=92 analog
gauge.
We can not find anything loose on the airplane, The cowling is solid,
the
float guide wire are tight.
Any idea what can cause this noise, it really seems to come from the
engine.
Thanks
Sylvain April
Envoy=E9 =E0 partir de Courrier
<https://go.microsoft.com/fwlink/?LinkId=550986>
pour Windows
Message 3
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| Subject: | Re: M14P sound during flight. |
We all seem to get a low frequency vibration or rough spot that it doesnt li
ke. Does it follow when changing power setting?
> On Sep 28, 2022, at 1:38 PM, Sylvain April <sapril001@hotmail.com> wrote:
>
> =EF=BB
> Hi all,
>
> I need your experience on the M14P. I am flying a Murphy Moose with a M14P
400HP engine spinning a MTV9 propeller.The airplane is on amphib floats.
>
> The engine runs OK with all the parameters in the green. But the engine ma
ke an unusual noise when we are in flight, it makes a kind of RAA_ RAA_ RAA
with a period of about 2 seconds. At 1840 RPM it is very noticable at 2000 R
PM it is louder, this noise can also be felt as a vibration in the floor of t
he airplane. The prop check OK no loose blade or damage, it perform normally
, The RPM is constant no variation seen on an 3 1/8=99=99 analog
gauge. We can not find anything loose on the airplane, The cowling is solid
, the float guide wire are tight.
>
> Any idea what can cause this noise, it really seems to come from the engin
e.
>
> Thanks
> Sylvain April
>
>
>
> Envoy=C3=A9 =C3- partir de Courrier pour Windows
>
Message 4
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| Subject: | Re: M14P sound during flight. |
I had the same issue until I dynamically balanced my propeller.
Mark
N621CJ
On Wed, Sep 28, 2022 at 7:43 PM Bill <wamflight@gmail.com> wrote:
> We all seem to get a low frequency vibration or rough spot that it doesnt
> like. Does it follow when changing power setting?
>
> On Sep 28, 2022, at 1:38 PM, Sylvain April <sapril001@hotmail.com> wrote:
>
> =EF=BB
>
> Hi all,
>
>
> I need your experience on the M14P. I am flying a Murphy Moose with a M14
P
> 400HP engine spinning a MTV9 propeller.The airplane is on amphib floats.
>
>
> The engine runs OK with all the parameters in the green. But the engine
> make an unusual noise when we are in flight, it makes a kind of RAA_ RAA_
> RAA with a period of about 2 seconds. At 1840 RPM it is very noticable a
t
> 2000 RPM it is louder, this noise can also be felt as a vibration in the
> floor of the airplane. The prop check OK no loose blade or damage, it
> perform normally, The RPM is constant no variation seen on an 3 1/8
=99=99
> analog gauge. We can not find anything loose on the airplane, The cowling
> is solid, the float guide wire are tight.
>
>
> Any idea what can cause this noise, it really seems to come from the
> engine.
>
>
> Thanks
>
> Sylvain April
>
>
> Envoy=C3=A9 =C3- partir de Courrier
> <https://go.microsoft.com/fwlink/?LinkId=550986> pour Windows
>
>
> --
Replied from my iPhone. Please excuse any typos in the content
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