Today's Message Index:
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1. 03:53 AM - twitching gauge needles. (bob noffs)
2. 04:09 AM - Re: twitching gauge needles. (James Kilford)
3. 12:13 PM - Re: FAR 23 and airplanes of any stripe (Robert L. Nuckolls, III)
4. 12:13 PM - Re: twitching gauge needles. (Robert L. Nuckolls, III)
5. 01:55 PM - Re: twitching gauge needles. (bob noffs)
6. 07:41 PM - Re: Footwell got burned! (Angus)
Message 1
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| Subject: | twitching gauge needles. |
a few weeks ago i posted about a friend with gauges that wouldn't hold
still. as was suggested, when he put in a proper ground from battery to
engine, his problems disappeared.
bob noffs
Message 2
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| Subject: | Re: twitching gauge needles. |
That's great news! Bob's espousal of the common ground prevents or cures a
multitude of aeroplane electrical sins.
Happy flying!
James
On 30 July 2013 11:52, bob noffs <icubob@gmail.com> wrote:
> a few weeks ago i posted about a friend with gauges that wouldn't hold
> still. as was suggested, when he put in a proper ground from battery to
> engine, his problems disappeared.
> bob noffs
>
> *
>
> *
>
>
Message 3
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| Subject: | Re: FAR 23 and airplanes of any stripe |
At 01:42 AM 7/30/2013, you wrote:
>Damn Bob, you're so right! Why didn't I suggest that. Just charge
>the battery at every stop and do away with the alternator all together. :)
>
>By the way, a 15 minute overload in the Cherokee probably falls
>outside the definition of a "Nuisance Trip".
I defined nuisance trip as a behavior in response to
an expected, normal condition.
>And if you'd opened the breaker on the input to the regulator you
>probably would have been able to reset the Over Voltage Protection
>circuit in the regulator and get the alternator back on line. Just a
>guess that when the output breaker opened the output voltage spiked
>and the OVP latched. Have to remove all the power to it to get it to
>reset. But you probably knew that.
Tried that. This event 'killed' something. It was before
I owned the airport so I wasn't 'plugged in' to failure
analysis and repairs needed to restore the system.
Too many of our brothers in the heavier iron business
believed that 60A nameplate rating for an alternator
was a limit. Regulators for the generators replaced
by alternators featured a calibrated current limit control
relay. In this case, generator output and nameplate rating
were in lockstep.
Emacs!
An alternator is inherently current limited but at a
value dependent on temperature. The nameplate rating is
worst case for max allowable operating temperature. In
OTHER conditions, the user should expect MORE than nameplate
output.
Failure to understand this feature prompted the folks to
keep the same breaker-to-nameplate rating as for the legacy
generators thus setting the stage for the relatively rare
but significant breaker tripping in response to a predictable
and expected operating condition. This drove my recommendations
for following in Beech's footsteps and using uber-robust
current limiters for b-lead protection.
Emacs!
Note that a 35A ANL limiter will carry 80A at room
temperature for ever . . . but hit it with a shorted
diode fed by a battery and it opens in 100 mS or less.
This style of protection will not nuisance trip.
Bob . . .
Message 4
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| Subject: | Re: twitching gauge needles. |
At 05:52 AM 7/30/2013, you wrote:
>a few weeks ago i posted about a friend with gauges that wouldn't
>hold still. as was suggested, when he put in a proper ground from
>battery to engine, his problems disappeared.
Actually, it would have been better to take the
instrument grounds to the engine and leave the battery
tied to a common firewall ground . . . but what ever
works! I'm pleased that his instruments are now
more stable.
Bob . . .
Message 5
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| Subject: | Re: twitching gauge needles. |
i dunno, the battery and engine/firewall were connected by the fuselege!.
bob noffs
On Tue, Jul 30, 2013 at 2:13 PM, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> nuckolls.bob@aeroelectric.com**>
>
>
> At 05:52 AM 7/30/2013, you wrote:
>
>> a few weeks ago i posted about a friend with gauges that wouldn't hold
>> still. as was suggested, when he put in a proper ground from battery to
>> engine, his problems disappeared.
>>
>
> Actually, it would have been better to take the
> instrument grounds to the engine and leave the battery
> tied to a common firewall ground . . . but what ever
> works! I'm pleased that his instruments are now
> more stable.
>
>
> Bob . . .
>
>
Message 6
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| Subject: | Re: Footwell got burned! |
loll fucking ugly chink girl got burned in the face from her chink boyfriend.
loll japan sucks ass
--------
http://www.rctophobby.com
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