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irampil(at)notes.cc.sunys
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 Posted: Tue Jan 09, 2007 8:34 am Post subject: Airmaster on Jabiru |
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At least on a rotax, the circular phase disposition of the prop hub is a non-issue. What are the possible issues
that might dictate a specific alignment?
Ira N224XS [quote][b]
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astills(at)cox.net
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| Posted: Tue Jan 09, 2007 9:00 am Post subject: Airmaster on Jabiru |
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Ira,
I have made some calls on this issue and it seems it is a non-issue on a 6
cyl with a 3 blade prop. A four cyl engine or a 2 blade is a different
matter, but thats not
what I have. Thanks to all who replied
Al Stills
N625Az
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ptag.dev(at)tiscali.co.uk
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| Posted: Tue Jan 09, 2007 10:05 am Post subject: Airmaster on Jabiru |
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Hi! Ira
There is possibility of conflicting resonance between the position of the blades and the power strokes of the engine which can be considerably reduced with the rotational alignment specifically arranged in relation to the power strokes. A three blade prop requires a different alignment to a two blade prop and I believe that a four cylinder engine compared to a six cylinder needs a different consideration too. Sorry I can’t help further but I’ve trawled through all my files to no avail. I know I once referenced the problem with MT Propellers and they made a definitive reply which I used to post on to a forum be it the Europa Forum or the Jabiru one.
Regards
Bob Harrison
Robt.C.Harrison
-----Original Message-----
From: owner-europa-list-server(at)matronics.com [mailto:owner-europa-list-server(at)matronics.com] On Behalf Of irampil(at)notes.cc.sunysb.edu
Sent: 09 January 2007 16:29
To: europa-list(at)matronics.com
Subject: Airmaster on Jabiru
At least on a rotax, the circular phase disposition of the prop hub is a non-issue. What are the possible issues
that might dictate a specific alignment?
Ira N224XS [quote] [b]
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grahamsingleton(at)btinte
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| Posted: Tue Jan 09, 2007 4:52 pm Post subject: Airmaster on Jabiru |
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Ira
Bob's right. Resonance is the issue. MT propellers will know the answer,
they usually do a vibration analysis and they are careful experienced
people.
You need to think where the pulses from the power strokes come, then
compare that with the pulses from the airflow. Those will be caused by
the pitch angle of the thrust line plus any
R.C.Harrison wrote:
| Quote: | Hi! Ira
There is possibility of conflicting resonance between the position of
the blades and the power strokes of the engine which can be
considerably reduced with the rotational alignment specifically
arranged in relation to the power strokes. A three blade prop requires
a different alignment to a two blade prop and I believe that a four
cylinder engine compared to a six cylinder needs a different
consideration too. Sorry I can’t help further but I’ve trawled through
all my files to no avail. I know I once referenced the problem with MT
Propellers and they made a definitive reply
Bob Harrison
Robt.C.Harrison
*
*
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