Today's Message Index:
----------------------
1. 02:00 AM - Vibration - suspect gearbox? (GBWFH2010)
2. 02:54 AM - Re: Vibration - suspect gearbox? (GRAHAM SINGLETON)
3. 03:28 AM - Re: Oil tank (Gtblu)
4. 03:46 AM - Re: Vibration - suspect gearbox? (Bob Harrison)
5. 07:14 AM - Re: Vibration - suspect gearbox? (Roger Lee)
6. 10:30 AM - Re: Vibration - suspect gearbox? (GBWFH2010)
Message 1
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| Subject: | Vibration - suspect gearbox? |
Aircraft: Europa Tri-Gear
Engine: Rotax 912 UL 80 Hp 350 Hours
Propellor: Airmaster AP332
For over a year I have been trying to track down noise/vibration issues. I have
done all the things that seem obvious: carb balancing, throttle/choke cables,
checking exhaust system, airframe/cowling, servicing the propeller etc. but
I can not find anything obvious. The symptoms are strange: take off and climb
are normal and the initial cruise is fine: prop in cruise, 26 inches MFP and a
steady 105Kts at 12.5 litres an hour. Anytime from 10 to 40mins after entering
the cruise the noise starts, quietly at first and then gradually louder with
a slight vibration. It is difficult to describe, more of a low frequency buzz
than a mechanical clatter but it does increase in volume. If I select climb pitch
the noise stops but returns when the cruise is re-established. Changing pitch
manually can reduce the noise slightly but it does not go away.
Bud Yearly has given me a comprehensive list of specific items to check which I
am in the process of doing, but I am interested to know if anyone has experienced
anything similar with their Rotax. Although my engine is quite low hours
it is 14 years old so I suspect a gearbox overhaul may well be required.
--------
Gordon Grant
G-BWFH
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=384913#384913
Message 2
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| Subject: | Re: Vibration - suspect gearbox? |
Which propeller is it?=0AGraham=0A=0A=0A________________________________=0A
From: GBWFH2010 <gaxuk2010@gmail.com>=0ATo: rotaxengines-list@matronics.co
m =0ASent: Monday, 8 October 2012, 9:59=0ASubject: RotaxEngines-List: Vibra
FH2010" <gaxuk2010@gmail.com>=0A=0AAircraft: Europa Tri-Gear =0AEngine: Rot
ax 912 UL 80 Hp 350 Hours=0APropellor: Airmaster AP332 =0A=0AFor over a yea
r I have been trying to track down noise/vibration issues. I have done all
the things that seem obvious: carb balancing, throttle/choke=C2- cables,
checking exhaust system, airframe/cowling, servicing the propeller etc. but
I can not find anything obvious. The symptoms are strange: take off and cl
imb are normal and the initial cruise is fine: prop in cruise, 26 inches MF
P and a steady 105Kts at 12.5 litres an hour. Anytime from 10 to 40mins aft
er entering the cruise the noise starts, quietly at first and then graduall
y louder with a slight vibration. It is difficult to describe, more of a lo
w frequency buzz than a mechanical clatter but it does increase in volume.
If I select =C3=A2=82=AC=CB=9Cclimb=C3=A2=82=AC=84=A2 pitch the no
ise stops but returns when the cruise is re-established. Changing pitch man
ually can reduce the noise slightly but it does not go away. =0A=0ABud Year
ly has given me a comprehensive list of specific items to check which I am
in the process of doing, but I am interested to know if anyone has experien
ced anything similar with their Rotax. Although my engine is quite low hour
s it is 14 years old so I suspect a gearbox overhaul may well be required.
=0A=0A--------=0AGordon Grant=0A=0AG-BWFH=0A=0A=0A=0A=0ARead this topic onl
ine here:=0A=0Ahttp://forums.matronics.com/viewtopic.php?p=384913#384913
- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- -
=============
Message 3
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Hi All,
I was hand turning the prop to try and get a gurgle, and was up to 120 revolutions
of the prop when it struck me that the line back to the tank must be blocked.
Well it was, but by the obscure method of the overflow pipe being kinked,
thus causing a build up of pressure I imagine in the scavenger tank and thus stopping
oil coming back into it. Continuous flying in that configuration may have
become interesting!
Thanks for all the suggestions, number 1 lesson again is to follow a hunch or a
change in character till your satisfied its OK.
Still haven't followed up the vibration.. That's next.
cheers
Geoff.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=384916#384916
Message 4
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| Subject: | Vibration - suspect gearbox? |
Hi! Gordon ,,,,,,
Mail me with an address which works please, gaxuk2010@gmail.com doesn't work?
Regards
Bob Harrison G-PTAG
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of GBWFH2010
Sent: 08 October 2012 09:59
Subject: RotaxEngines-List: Vibration - suspect gearbox?
--> <gaxuk2010@gmail.com>
Aircraft: Europa Tri-Gear
Engine: Rotax 912 UL 80 Hp 350 Hours
Propellor: Airmaster AP332
For over a year I have been trying to track down noise/vibration issues. I have
done all the things that seem obvious: carb balancing, throttle/choke cables,
checking exhaust system, airframe/cowling, servicing the propeller etc. but
I can not find anything obvious. The symptoms are strange: take off and climb
are normal and the initial cruise is fine: prop in cruise, 26 inches MFP and a
steady 105Kts at 12.5 litres an hour. Anytime from 10 to 40mins after entering
the cruise the noise starts, quietly at first and then gradually louder with
a slight vibration. It is difficult to describe, more of a low frequency buzz
than a mechanical clatter but it does increase in volume. If I select climb pitch
the noise stops but returns when the cruise is re-established. Changing pitch
manually can reduce the noise slightly but it does not go away.
Bud Yearly has given me a comprehensive list of specific items to check which I
am in the process of doing, but I am interested to know if anyone has experienced
anything similar with their Rotax. Although my engine is quite low hours
it is 14 years old so I suspect a gearbox overhaul may well be required.
--------
Gordon Grant
G-BWFH
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=384913#384913
Message 5
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| Subject: | Re: Vibration - suspect gearbox? |
I have seen many people think it was an engine issue, but really turned out to
be the fuselage and the wind doing weird things in gaps or from fittings.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center - Heavy Maint. Rated
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=384928#384928
Message 6
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| Subject: | Re: Vibration - suspect gearbox? |
Sorry, due to an error in my profile the email address is incorrect. My correct
email is gaxuk2001@gmail.com
Graham: The prop is an Airmaster AP 322 Constant Speed fitted with 3 x 63" tapered
blades.
Roger: Yes, I have been checking the airframe/cowlings very carefully but have
not found anything obvious yet. I did not make any changes to the aircarft prior
to the noise commencing but I am still looking!
--------
Gordon Grant
G-BWFH
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=384940#384940
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