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VE3LVO(at)rac.ca
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 Posted: Mon Jan 02, 2006 8:47 am Post subject: 914 drivers only please! |
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Intermediate frame mounting -
To Steve, Kevin, Bob, Cliff, Paul, Patrick, Fred and others:
Many thanks for such a lrage and quick reply to my plea. One or
two misinterpreted the problem but in most cases the solution varied
between longer bolts or replacement after compression. I worried that a
longer bolt would soon be an inappropriate length after compression - grip
and all that. Fred came up with the "'why didn't I think of that" solution -
threaded 5/16 cut to size until compression allowed 5A-40 replacement. Lord
knows I used it elsewhere but ennui and frustration claimed the day.
I will explore that avenue, while I fuss over the next plateau -
the placing of the oil tank makes it impossible to site the filter
compartment below it. All the photos show the tank at the top of its
possible height, yet the filter compartment metal is still too high to house
the tank drain - and probably other facilities.
It's just one did-it-wrong after another............
May 2006 be a better backdrop......
Cheers, Ferg
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BEBERRY(at)aol.com
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| Posted: Mon Jan 02, 2006 10:27 am Post subject: 914 drivers only please! |
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hurstkr(at)growzone.com.a
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| Posted: Mon Jan 02, 2006 12:35 pm Post subject: 914 drivers only please! |
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| Quote: | My particular one is vibration. Horrid airframe vibration between
2000 and |
3700 rpm with my 914
Patrick,
Have you tried getting your propeller dynamically balanced whilst on the
aircraft ?
Also, have you checked your spinner for run-out? Have you tried it
without the spinner ?
Has the aircraft ever had a prop strike ?
Cheers
Kingsley
Happy New Year to all.
Do not archive
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BEBERRY(at)aol.com
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| Posted: Mon Jan 02, 2006 1:07 pm Post subject: 914 drivers only please! |
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ptag.dev(at)tiscali.co.uk
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| Posted: Mon Jan 02, 2006 1:16 pm Post subject: 914 drivers only please! |
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Hi! Patrick.
I am no Rotax Authority but:-
a) Did you get the carburettor's balanced?
b) Is the "sprag clutch" in good order?
c) Did you have the prop balanced dynamically?
d) Have you had a stress resonance check done on the prop/engine
combination?
e) is your ignition working adequately on all cylinders?
Regards
Bob Harrison
Do not archive.
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acrojim(at)cfl.rr.com
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| Posted: Mon Jan 02, 2006 2:24 pm Post subject: 914 drivers only please! |
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You might try checking the pitch of each blade to see if all are the same.
Jim
BEBERRY(at)aol.com wrote:
Hope you have all your problems sorted now Ferg. There will be more!!
My particular one is vibration. Horrid airframe vibration between 2000 and
3700 rpm with my 914. Fuel drained and refilled, filters cleaned, carbs
cleaned and jets., carbs balanced with proper kit, set of new plugs fitted,
engine mounts checked. New Arplast prop back in France for re-balancing. All
plugs show equally nice and grey. I have run out of ideas. Has anyone
experienced similar problems and can suggest any other areas of search please ?
Had no problems with the old Warpdrive (now defunct).
Patrick
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SPurpura(at)aol.com
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| Posted: Mon Jan 02, 2006 4:49 pm Post subject: 914 drivers only please! |
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You should get a dynamic balance done with a new prop,,just for peace of
mind.
Sam N77EU
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rparigor(at)suffolk.lib.n
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| Posted: Mon Jan 02, 2006 5:19 pm Post subject: 914 drivers only please! |
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Hello Patrick
No real life experience, some ideas though.
After you get prop back, do a dynamic balance of prop (on plane and
running)after you make sure blades track the same and they are all at the
same pitch, check your motor mounts are in good shape and fully tightened,
might as well check to see if all mounts are not cracked.
Make sure that the throttle cables where they attach to arms on carbs
rotate free, if they do not there will be an imbalance because 1 carb will
be opened more than the other.
Check out Causes of Vibration at:
http://www.rotaxservice.com/rotax tips/rotax troubleshooting.htm
You need Power Point.
Ron Parigoris
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terrys(at)cisco.com
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| Posted: Tue Jan 03, 2006 9:46 am Post subject: 914 drivers only please! |
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Hi Patrick,
We had problems with vibration in that rpm range that had us stumped for
a while. It turned out to be a mis-match in the prop blade incidences
on our Airmaster prop. As I recall, one blade was almost one degree off
from the other two. Turned out to be a problem with the blade followers
that was eventually corrected by the factory. Depending on how the
blades were installed in the hub (and the orientation of the followers),
the incidences could come out fairly close, or be rather bad.
Regards,
Terry Seaver
A135 / N135TD
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