Today's Message Index:
----------------------
1. 06:01 AM - Re: Starter engaged warning lights (Dale Ellis)
2. 08:55 AM - Re: Starter engaged warning lights (Robert L. Nuckolls, III)
3. 09:31 AM - Re: Starter engaged warning lights (Dale Ellis)
4. 10:07 AM - Re: Starter engaged warning lights (Robert L. Nuckolls, III)
5. 10:52 AM - Surplus whisky compass (Robert L. Nuckolls, III)
6. 11:02 AM - Re: Surplus whisky compass (Earl Schroeder)
7. 11:24 AM - Surplus whisky compass SOLD (Robert L. Nuckolls, III)
8. 12:59 PM - Re: Surplus whisky compass SOLD (Earl Schroeder)
Message 1
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| Subject: | Re: Starter engaged warning lights |
I added this feature to my RV-8 as omage to my former life as a Captain on
a Dehavilland DHC-8 where the first item on the after-start check list was
"START LIGHT -- OUT"!!
Dale
On Thursday, February 18, 2016, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
>
> Although relatively rare, having the starter and flywheel teeth jam
> and break in flight might make for a "stormy night" story :-(
>
>
> Not sure how much of a risk this is.
> Every starter I'm aware of has an over-running
> clutch built onto the pinion gear shaft. Hangar
> myths about stuck pinions back driving a starter
> and turning it into a generator are without
> merit. Further, the solenoid/contactor configuration
> of choice features a robust disengagement mechanism.
>
> The only 'unintentional engagements' I've
> heard about over the last 20 years have
> involved stuck contactors that kept the pinion
> gear electrically engaged. One such case involved
> a aerobatic performance airplane at OSH where
> the entire routine was performed with the starter
> engaged.
>
> While chewed up ring gears and pinons are ugly,
> they don't represent much of a hazard to the engine
> or airplane.
>
> The strongest prophylactic against these events
> are a strong battery and a modern, stick-resistant
> contactor.
>
> Most mechanical risk for pinion gear retraction
> failure have foundation in poor maintenance . . .
> a 'hard stick' is going to be preceded by a series
> of tentative sticks. Just keep the shaft clean
> and watch the pinion gear teeth for changes
> in wear patterns.
>
>
> Bob . . .
>
Message 2
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| Subject: | Re: Starter engaged warning lights |
At 07:59 AM 2/20/2016, you wrote:
>I added this feature to my RV-8 as omage to my
>former life as a Captain on a Dehavilland DHC-8
>where the first item on the after-start check list was "START LIGHT -- =C2
OUT"!!
>
>Dale
Little different breed of cat there. On many turbine
aircraft, the starter contactor on a series/shunt
starter-generator needs to be confirmed open before
a second contactor grabs armature output at the
other end of the series field winding which is used
only for starting.
In this case, the starter-generator is always
geared to the engine.
That light is driven by a micro-switch built into
the contactor's engagement hardware that verifies
the contacts are open thereby extinguishing the
light. Having that contactor stuck shut when the
circuit is re-configured for generator service
makes for some unhandy current flows in some
rather fat wires.
"Unhandy" current flows in fat wires can be a
real PITA . . .
Bob . . .
Message 3
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| Subject: | Re: Starter engaged warning lights |
Oh I agree Bob. I have no idea what the current inrush is when one of
those starters is engaged, but it has to be a bunch. The lights would dim
briefly when a starter was engaged and that was with the APU DC gen on line
.
As I said, I added it more for nostalgia then anything else.
Dale
On Sat, Feb 20, 2016 at 11:53 AM, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> At 07:59 AM 2/20/2016, you wrote:
>
> I added this feature to my RV-8 as omage to my former life as a Captain o
n
> a Dehavilland DHC-8 where the first item on the after-start check list wa
s
> "START LIGHT -- =C3=82 OUT"!!
>
> Dale
>
>
> Little different breed of cat there. On many turbine
> aircraft, the starter contactor on a series/shunt
> starter-generator needs to be confirmed open before
> a second contactor grabs armature output at the
> other end of the series field winding which is used
> only for starting.
>
> In this case, the starter-generator is always
> geared to the engine.
>
> That light is driven by a micro-switch built into
> the contactor's engagement hardware that verifies
> the contacts are open thereby extinguishing the
> light. Having that contactor stuck shut when the
> circuit is re-configured for generator service
> makes for some unhandy current flows in some
> rather fat wires.
>
> "Unhandy" current flows in fat wires can be a
> real PITA . . .
>
>
> Bob . . .
>
Message 4
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| Subject: | Re: Starter engaged warning lights |
At 11:29 AM 2/20/2016, you wrote:
>Oh I agree Bob.=C2 I have no idea what the
>current inrush is when one of those starters is
>engaged, but it has to be a bunch.=C2 The lights
>would dim briefly when a starter was engaged and
>that was with the APU DC gen on line.
>
>As I said, I added it more for nostalgia then anything else.
Understand. Inrush on a turbine engine is typically
1000A . . . Here's a plot taken from a Beech 400
(Beechjet/MU300) . . . real contact welder!
Emacs!
Thanks for the expansion!
Bob . . .
Message 5
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| Subject: | Surplus whisky compass |
I've got an legacy whisky compass that is surplus
to my plans. Magnets recharged, new gaskets,
fresh fluid.
Lettering is quite white. I'd like to get
$60 + postage for it.
Emacs!
Bob . . .
Message 6
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| Subject: | Re: Surplus whisky compass |
If it is still avil. I will buy it. Earl
On Feb 20, 2016 12:59 PM, "Robert L. Nuckolls, III" <
nuckolls.bob@aeroelectric.com> wrote:
>
>
> I've got an legacy whisky compass that is surplus
> to my plans. Magnets recharged, new gaskets,
> fresh fluid.
>
> Lettering is quite white. I'd like to get
> $60 + postage for it.
>
>
> [image: Emacs!]
>
> Bob . . .
>
Message 7
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| Subject: | Surplus whisky compass SOLD |
At 01:01 PM 2/20/2016, you wrote:
>If it is still avil.=C2 I will buy it.=C2 Earl
You've got it. I sent you a PayPal invoice . . .
Bob . . .
Message 8
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| Subject: | Re: Surplus whisky compass SOLD |
Should have now.
Earl Schroeder.
5436 Saint Phillip Rd S.
Evansville, IN. 47712
On Feb 20, 2016 1:29 PM, "Robert L. Nuckolls, III" <
nuckolls.bob@aeroelectric.com> wrote:
>
> At 01:01 PM 2/20/2016, you wrote:
>
>> If it is still avil.=C3=82 I will buy it.=C3=82 Earl
>
>
> You've got it. I sent you a PayPal invoice . . .
>
>
> Bob . . .
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