Today's Message Index:
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1. 10:30 AM - Re: Alternator Position (Michael Orth)
2. 11:05 AM - Re: Active VOR antenna ()
3. 02:08 PM - Re: Active VOR antenna (Robert L. Nuckolls, III)
4. 02:10 PM - Re: Active VOR antenna (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: Alternator Position |
Hi Bob,
Just got off the telephone with Neal George from Continental.
Neal is a very nice and knowledgeable man who is also very easy to talk to.
With regard to how the generator may become "vertical" as opposed to its
current horizontal orientation, it is moving to an M-14 from a Continental
IO-470-L.
In the process, it will also become gear-driven rather than belt-driven.
Neal agreed with you that the perpendicular force vector. . .the force
applied on the armature perpendicular to the axis of rotation by the drive
belt. . .would be lessened with a gear-driven installation.
Neal also agreed that the physical orientation of the generator should have
no effect on its mechanical life.
Thanks to both you and Neal for your help,
Michael
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-----Original Message-----
From: Robert L. Nuckolls, III
Sent: Thursday, May 7, 2015 11:40 AM
Subject: Re: AeroElectric-List: Alternator Position
<nuckolls.bob@aeroelectric.com>
At 13:01 2015-05-07, you wrote:
><mosurf@xplornet.com>
>
>Hi Bob,
>
>Actually, I must revise my original post.
>
>I have a generator..not an alternator.
>Of course, it is buried by other equipment and I am unable to make out the
>nomenclature tag without extensive dismantling.
>The Parts Manual is mum on the subject of manufacturer.
>The generator is 25 amps and externally regulated.
>It is currently mounted on a Continental IO-470-L. Beech Baron.
>It is belt-driven.
>
>Thanks,
>Michael
Interesting. As Neal has suggested, he may
be able to offer advise that's more application
specific. But I am curious as to how the installation
became 'vertical'.
I can't imagine that it would make any difference
for bearings. While there are such things as THRUST
bearings designed to take rated loads axially
oriented to the shaft, a ball bearing still
has significant performance for axial loading.
A major force on the belt driven generator
is belt tension. I would imagine armature
weight to be on the order of 1/3 or less
the belt force.
The force vector on the bearing would move
out of the bottom of the races . . . but
they're hard there too. The weakest mechanical
link in a generator is brush-wear. I suspect
you'll be replacing brushes at much shorter
intervals than for any other reason. Once you
have the machine off the airplane for attention,
you might as well replace bearings at the same
time . . . they're probably cheaper than the
brushes!
But give Neal a buzz and let us know what
you discover.
Bob . . .
-----
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Message 2
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| Subject: | Re: Active VOR antenna |
About a 24-30" run between antenna location and Garmin GTN-650 radio.
I would plan a short pigtail ~4" off the end of the antenna with a female
BNC connector. Similar with the power wire. To allow the canard to be
removed for maintenance and inspection, connectors local to the antenna
installation area are required.
Thanks,
-James
-----Original Message-----
From: Robert L. Nuckolls, III
Sent: Thursday, May 07, 2015 6:37 PM
Subject: Re: AeroElectric-List: Active VOR antenna
<nuckolls.bob@aeroelectric.com>
At 15:43 2015-04-24, you wrote:
>Bob,
>
>Have you been able to assess the active VOR antenna? Were about 30
>days from first flight and really need a retrofit VOR antenna solution for
>this bird as we discussed.
What is the length of cable from the
end of the antenna to your receiver?
Message 3
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| Subject: | Re: Active VOR antenna |
At 15:43 2015-04-24, you wrote:
>Bob,
>
>Have you been able to assess the active VOR
>antenna? Were about 30 days from first
>flight and really need a retrofit VOR antenna
>solution for this bird as we discussed.
>
>Thanks,
>James
What is the coax cable length from cable end of antenna
to your receiver. Is the receiver connector BNC?
Bob . . .
Message 4
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| Subject: | Re: Active VOR antenna |
At 13:03 2015-05-08, you wrote:
>
>About a 24-30" run between antenna location and Garmin GTN-650 radio.
>
>I would plan a short pigtail ~4" off the end of the antenna with a
>female BNC connector. Similar with the power wire. To allow the
>canard to be removed for maintenance and inspection, connectors
>local to the antenna installation area are required.
>
>Thanks,
>-James
Oops . . . missed this. Will do.
Bob . . .
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