Today's Message Index:
----------------------
1. 04:59 AM - Re: Potter and Brumfield (D Fritz)
2. 07:28 AM - Re: Potter and Brumfield (Robert L. Nuckolls, III)
3. 08:14 AM - Genesis Switches (Larry Bowen)
4. 09:53 PM - ADF sense antenna (Scott Jackson)
5. 10:24 PM - Re: ADF sense antenna (Brian Lloyd)
Message 1
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| Subject: | Re: Potter and Brumfield |
--> AeroElectric-List message posted by: D Fritz <dfritzj@yahoo.com>
"W31 are a whole lot more expensive than a simple switch. The only
rational thought process for using them would be to eliminate the
need for another breaker on the bus . . . but of course, using
these switches forces you to have two busses - one for the breakers
that don't "switch" and one for the switches that "break"
Are you planning a breaker panel for non-switched functions?"
Bob,
I'm still on the fence between fuses and breakers, but it seems to me that using
the W31 breakers for my switched loads (about a dozen), I avoid making jumpers
from a fuse block (or circuit breaker) to a switch. This reduces the number
of connections to fail as well as the parts count. Is there any reason the
switched versus unswitched breakers can't be on the same bus? I would think one
could arrange them in a fashion that allowed both to attach to the same bus
and still allow adequate access to the breakers and the switches.
Dan Fritz
Message 2
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| Subject: | Re: Potter and Brumfield |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <b.nuckolls@cox.net>
At 04:58 AM 10/16/2004 -0700, you wrote:
>--> AeroElectric-List message posted by: D Fritz <dfritzj@yahoo.com>
>
>"W31 are a whole lot more expensive than a simple switch. The only
> rational thought process for using them would be to eliminate the
> need for another breaker on the bus . . . but of course, using
> these switches forces you to have two busses - one for the breakers
> that don't "switch" and one for the switches that "break"
>
> Are you planning a breaker panel for non-switched functions?"
>
>Bob,
>I'm still on the fence between fuses and breakers, but it seems to me that
>using the W31 breakers for my switched loads (about a dozen), I avoid
>making jumpers from a fuse block (or circuit breaker) to a switch. This
>reduces the number of connections to fail as well as the parts count.
Don't forget the parts count INSIDE the components. See:
http://www.aeroelectric.com/Pictures/W31_1.jpg
It becomes a trade off on your confidence for installing terminals
(fast-ons
at that) on two ends of a piece of wire versus your confidence that all
that
monkey motion inside the switch offers a superior solution for system
reliability.
> Is there any reason the switched versus unswitched breakers can't be on
> the same bus?
No, but generally the cockpit is arranged so that pilot controls
(switches) are in front of pilot and maintenance controls (breakers)
are more remote, like on sidewalls or far right side. It's all driven
by your panel real estate budgets and ergonomics.
Bob . . .
---
Message 3
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| Subject: | Genesis Switches |
--> AeroElectric-List message posted by: "Larry Bowen" <Larry@BowenAero.com>
Doh!
-
Larry Bowen
Larry@BowenAero.com
http://BowenAero.com
Do not archive
Backward drawings may be behind spacecraft crash
LOS ANGELES - The fragile NASA spacecraft that smashed into the Utah desert
last month as it brought home samples of the sun may have been doomed by
engineering drawings that had been done backward, an investigating board
said yesterday.
Because of the backward drawings, the switches that were supposed to detect
Genesis' re-entry into Earth's atmosphere and trigger its parachutes were
placed incorrectly, said Michael G. Ryschkewitsch, the chairman of the
board.
He said, however, that the panel has not completed its findings on what went
wrong with the $264 million mission to capture particles of the solar wind.
The design drawings were produced by Lockheed Martin Astronautics, which
built Genesis for NASA, Ryschkewitsch said.
Message 4
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| Subject: | ADF sense antenna |
--> AeroElectric-List message posted by: "Scott Jackson" <jayeandscott@telus.net>
Gentlemen:
It looks like at least one of my four teenagers will train for their instrument
rating in our RV-6. It already has a navcom with glidepath and I have a Narco
ADF 140 that I'd like to put in, if only temporarily.
But the ADF came with both a shoe antenna and the long wire sense antenna, which
would be hard to mount on an RV-6.
How would it work without the sense antenna, if at all? Is there an aftermarket
combination antenna that I could use?
I'm aware that ADF appears to be going the way of the do-do bird, but, in Canada,
GPS can only be used for overlay approaches if the aircraft is equipped with
the original receivers the approach required.
Scott in Vancouver
Message 5
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| Subject: | Re: ADF sense antenna |
--> AeroElectric-List message posted by: Brian Lloyd <brianl@lloyd.com>
> But the ADF came with both a shoe antenna and the long wire sense
> antenna, which would be hard to mount on an RV-6.
> How would it work without the sense antenna, if at all?
It won't work.
> Is there an aftermarket combination antenna that I could use?
For the Narco? I don't think so. Both the KR-86 and KR-87 had a
combined loop/sense antenna.
Brian Lloyd 6501 Red Hook Plaza
brianl@lloyd.com Suite 201
+1.340.998.9447 St. Thomas, VI 00802
I fly because it releases my mind from the tyranny of petty things . . .
Antoine de Saint-Exupry
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