Today's Message Index:
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1. 10:09 AM - Need Info on Vintage Landing Light (Eric M. Jones)
2. 11:44 AM - Re: Need Info on Vintage Landing Light (Robert L. Nuckolls, III)
3. 12:41 PM - Re: Need Info on Vintage Landing Light (Eric M. Jones)
4. 12:59 PM - Starter motor as generator (Jeff Page)
5. 03:24 PM - Re: Re: Need Info on Vintage Landing Light (Bob McCallum)
6. 05:31 PM - Re: Starter motor as generator (Robert L. Nuckolls, III)
7. 05:42 PM - Re: Starter motor as generator (Robert L. Nuckolls, III)
8. 08:58 PM - Re: Starter motor as generator (Jeff Page)
9. 10:14 PM - Re: Starter motor as generator (Richard Girard)
10. 11:20 PM - Re: Switch Ratings Conversion (AC to DC) for ST23N Toggle Swit (stearman456)
Message 1
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| Subject: | Need Info on Vintage Landing Light |
I came across a 19 pcs of Westinghouse Mazda 239W Aircraft Landing Lights (it actually
says Headlight..which dates it). I have 9 of the 24V bulbs and 10 of the
identical but12V bulbs. It appears that these are from the early 1930's since
they fit the (UK) Rearwin Cloudster for example.
How do I best sell these and to whom? What are 1930 landing lights worth? I can't
imagine there are more than a few of these on the planet.
eh?
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones@charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=366619#366619
Attachments:
http://forums.matronics.com//files/239w_mazda_544.jpg
Message 2
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| Subject: | Re: Need Info on Vintage Landing Light |
At 12:01 PM 2/19/2012, you wrote:
I came across a 19 pcs of Westinghouse Mazda 239W Aircraft Landing
Lights (it actually says Headlight..which dates it). I have 9 of the
24V bulbs and 10 of the identical but12V bulbs. It appears that these
are from the early 1930's since they fit the (UK) Rearwin Cloudster
for example.
How do I best sell these and to whom? What are 1930 landing lights
worth? I can't imagine there are more than a few of these on the planet.
These guys seem to think they're worth about $8 each . . .
http://bulbs.2yr.net/mazda-airplane.php
Bob . . .
Message 3
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| Subject: | Re: Need Info on Vintage Landing Light |
Bob,
$8 is what the guy paid for the one in his museum collection. It is not for sale.
There isn't another I can find anywhere.
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones@charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=366634#366634
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| Subject: | Starter motor as generator |
A friend of mine asked me a question I didn't know the answer to.
If the starter contactor sticks on, I assume it would act like a
generator, and there would be a current path back to the bus.
Would the starter motor spin fast enough to generate a high enough
voltage to hurt anything ?
The overvoltage circuit would kick in and disconnect the alternator,
but that would do nothing to help.
Is an indication the starter contactor is engaged useful ? It still
wouldn't indicate if the bendix gear stuck, just the starter
contactor, so still not always an indicator.
Is there enough noise from the bendix gear and starter being overspun
by the engine to alert the pilot ?
Jeff Page
Dream Aircraft Tundra #10
Message 5
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| Subject: | Re: Need Info on Vintage Landing Light |
Eric;
Here's a guy specializing in locating and selling rare and obsolete light
bulbs. He lists your bulbs on his site but says he is sold out. He might be
an interested customer or perhaps give a hint as to the value.
http://tinyurl.com/8yykt4t
http://tinyurl.com/rqspa
Bob McC
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-
> server@matronics.com] On Behalf Of Eric M. Jones
> Sent: Sunday, February 19, 2012 3:40 PM
> To: aeroelectric-list@matronics.com
> Subject: AeroElectric-List: Re: Need Info on Vintage Landing Light
>
<emjones@charter.net>
>
> Bob,
>
> $8 is what the guy paid for the one in his museum collection. It is not
for sale. There
> isn't another I can find anywhere.
>
> --------
> Eric M. Jones
> www.PerihelionDesign.com
> 113 Brentwood Drive
> Southbridge, MA 01550
> (508) 764-2072
> emjones@charter.net
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=366634#366634
>
>
>
>
>
>
>
> _-
> ====================================================
> ======
> _-
> ====================================================
> ======
> _-
> ====================================================
> ======
> _-
> ====================================================
> ======
>
>
Message 6
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| Subject: | Re: Starter motor as generator |
At 02:58 PM 2/19/2012, you wrote:
>
>A friend of mine asked me a question I didn't know the answer to.
>
>If the starter contactor sticks on, I assume it would act like a
>generator, and there would be a current path back to the bus.
No, all starters must be fitted with an over-running
disconnect clutch of some kind. Should a pinion gear
left solidly hooked to the starter's gearing it would
probably strip the armature pinion or spin windings
out of the armature slots
If it's a series wound starter, it will indeed spin
fast but because it is taking current out of the battery
an not because the engine is back-driving it. If you
browse through old patents on 'starter drives' you'll
an interesting array of de-clutching mechanisms designed
to prevent back driving. But as early as 1944 I found
the use of a 'sprag clutch' to prevent the starter from
being back-driven by the engine.
Figure 2 of http://www.freepatentsonline.com/2333765.pdf
http://en.wikipedia.org/wiki/Sprag_clutch
>Would the starter motor spin fast enough to generate a high enough
>voltage to hurt anything ?
A stuck starter is an unloaded motor, not a driven
generator.
>The overvoltage circuit would kick in and disconnect the alternator,
>but that would do nothing to help.
Moot point. Such a condition does not generate
an OV.
>Is an indication the starter contactor is engaged useful ? It still
>wouldn't indicate if the bendix gear stuck, just the starter
>contactor, so still not always an indicator.
Starter engagement disconnects are very simple mechanisms
but they're right up on the front of the engine to get
rained on, dusty, etc. If the pinion uses acceleration
inertia to engage it then it's a good candidate for
yearly tear down, cleaning and re-lubrication.
>Is there enough noise from the bendix gear and starter being overspun
>by the engine to alert the pilot ?
Maybe not. If your starter is a modern device
with a solenoid driven pinion gear engagement,
a stuck starter contactor is about the only
thing that can cause the pinion to hang in the
engaged position. I've hear of airshow pilots
flying hopped up airplanes suffering a hung
pinion and flew their routine with the pinion
spinning at a gazaillion rpm. Didn't heare
it before takeoff but had a starter and ring
gear replacement job to do on the ground.
Modern, low area, high pressure, intermittent
starter contactors energized with a robust
battery rarely hang. Further, these contactors
often have an "I" terminal which can be used to
driven a "starter energized" light.
http://www.aeroelectric.com/Pictures/Contactors/s702wire.jpg
Bob . . .
Message 7
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| Subject: | Re: Starter motor as generator |
At 02:58 PM 2/19/2012, you wrote:
P.S. After sending the earlier reply I recalled the
origins of the OV legend. In airplanes with ammeters
(either minus-zero-plus battery ammeters =OR= an
alternator loadmeter), immediately after engine start
the ammeter would be hard-over feigning a strong effort
to 'recharge' the battery. In fact, the voltage regulator
was dumping current from alternator in response to
what it believed as a badly discharged battery. In
point of fact, the battery was fine but being heavily
loaded . . . perhaps to some value greater than alternator
output, by the free running starter motor.
This very high alternator output was mis-interpreted as
an OV event-in-progress as opposed to a misguided regulator
thinking it was being asked to recharge a dead battery.
Bob . . .
Message 8
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| Subject: | Re: Starter motor as generator |
Bob,
You are full of wisdom as always.
Again, I appreciate you teaching me.
Thanks !
Jeff Page
Dream Aircraft Tundra #10
Do not archive
Message 9
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| Subject: | Re: Starter motor as generator |
Right after high school I bought a 1959 Alfa Romeo Giulietta Spider.
Besides being a positive ground which made doing anything on the electrical
system a true PITA, it didn't have a spring return on the starter switch,
you had to physically turn the starter motor off. When I sold the car to my
best friend, I told him never to let anyone else drive the car. Two weeks
later he let his step brother drive it. Yep, he left the starter engaged
the entire time. The current flowing back through the system boiled the
battery and cooked the voltage regulator. It was only after he replaced
every major component in the starter generator system that he was able to
get the car to run right. Before that he went through three batteries. That
took most of the winter of 1971 and just a week after he got it running
again a car in front of him kicked up a stone that punctured the radiator.
The kid at the gas station ran cold water into the overheated engine which
caused the roof of the number three combustion chamber to crack right down
the center line of both valves and the spark plug. Dave was convinced the
car was cursed by then and sold it for $100. Forty years later he's still
one of my best friends, but that car nearly killed that, too.
Rick Girard
On Sun, Feb 19, 2012 at 2:58 PM, Jeff Page <jpx@qenesis.com> wrote:
>
> A friend of mine asked me a question I didn't know the answer to.
>
> If the starter contactor sticks on, I assume it would act like a
> generator, and there would be a current path back to the bus.
>
> Would the starter motor spin fast enough to generate a high enough voltage
> to hurt anything ?
>
> The overvoltage circuit would kick in and disconnect the alternator, but
> that would do nothing to help.
>
> Is an indication the starter contactor is engaged useful ? It still
> wouldn't indicate if the bendix gear stuck, just the starter contactor, so
> still not always an indicator.
>
> Is there enough noise from the bendix gear and starter being overspun by
> the engine to alert the pilot ?
>
> Jeff Page
> Dream Aircraft Tundra #10
>
>
--
Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
Message 10
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| Subject: | Re: Switch Ratings Conversion (AC to DC) for ST23N |
Toggle Swit
Thanks, Bob. After rereading your article I see where my math went awry. It looks
like those switches will work out fine.
Dan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=366679#366679
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