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jmason(at)lightspeed.net
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 Posted: Tue Dec 18, 2007 8:49 am Post subject: Clearance/delivery switch |
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I am interested in wiring a Cl/Del switch into the system. I would like
to power up just a Comm. and EFIS and not have everything drawing
current. Am also, while dreaming, thinking that it would be nice to
have that circuit drop out when the master is switched on. I know that
this is not new as some certified aircraft have it. I just don't know
or have the knowledge to figure it out.
Thanks, John
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JOHN TIPTON
Joined: 17 Sep 2006
Posts: 239
Location: Torquay - England
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| Posted: Tue Dec 18, 2007 10:16 am Post subject: Clearance/delivery switch |
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What is a C1/Del switch
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longg(at)pjm.com
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| Posted: Tue Dec 18, 2007 1:46 pm Post subject: Clearance/delivery switch |
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John,
The wrap I got from Bob on this same question last week was that this
should be designed into your endurance bus. Example I use is Z19 where
you have the alternate switch for the endurance buss. Since you have
followed good design you already have a minimum of equipment on that
bus. That equipment would include one radio.
So, switch on e-Bus, wow, you've fired up a whole 5-7 amps and key the
radio. Ready for clearance.
If you are a real die hard, buy another small fuse bus, a switch and
have a single radio tied to that bus. If you are a real cheapo, buy and
inline fuse and wire one of the radio power lines direct to a battery.
Of course you will always need to turn that on/off. That would be a
great excuse for a 3rd radio.
RV-7 heavy cleared to taxi.
--
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nuckolls.bob(at)cox.net
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| Posted: Tue Dec 18, 2007 7:47 pm Post subject: Clearance/delivery switch |
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At 07:15 AM 12/18/2007 -0800, you wrote:
| Quote: |
I am interested in wiring a Cl/Del switch into the system. I would like to
power up just a Comm. and EFIS and not have everything drawing current.
Am also, while dreaming, thinking that it would be nice to have that
circuit drop out when the master is switched on. I know that this is not
new as some certified aircraft have it. I just don't know or have the
knowledge to figure it out.
|
Do you plan to have an E-bus? The clearance delivery
switch was concocted for TC aircraft that do not
and probably never will have an e-bus. The e-bus
was crafted specifically for non-TC aircraft that
need a dual-path, frugal use of energy mod for
accomplishing HOURS of en-route flight battery-only.
So, if you plan to have an e-bus, then powering up
the e-bus a couple of minutes for ATIS and a clearance
represents only a tiny fraction of the battery's total
energy content.
Making an clearance delivery function drop
automatically is an interesting gee-whizz . . . but
how about powering your comm transceiver from
the battery bus and just making sure it's on
your checklist for post flight power down?
See option A on
http://www.aeroelectric.com/Pictures/Schematics/Clearance_Delivery_A.pdf
Option B adds a switch to select either Battery
or E-bus for powering the radio.
On this drawing . . .
http://www.aeroelectric.com/Pictures/Schematics/Clearance_Delivery_B.pdf
Option C shows one of several ways to get an
auto-canceling transfer of comm radio power
from the e-bus to the battery bus. . . adds
a lot of "monkey motion" to the radio's power
path.
Better yet, how about using your hand-held for getting
clearance . . . this provides for pre-flight
verification of the hand-held's functionality.
Bob . . .
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nuckolls.bob(at)cox.net
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| Posted: Wed Dec 19, 2007 5:54 am Post subject: Clearance/delivery switch |
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At 04:44 PM 12/18/2007 -0500, you wrote:
| Quote: |
John,
The wrap I got from Bob on this same question last week was that this
should be designed into your endurance bus. Example I use is Z19 where
you have the alternate switch for the endurance buss. Since you have
followed good design you already have a minimum of equipment on that
bus. That equipment would include one radio.
So, switch on e-Bus, wow, you've fired up a whole 5-7 amps and key the
radio. Ready for clearance.
If you are a real die hard, buy another small fuse bus, a switch and
have a single radio tied to that bus. If you are a real cheapo, buy and
inline fuse and wire one of the radio power lines direct to a battery.
Of course you will always need to turn that on/off. That would be a
great excuse for a 3rd radio.
RV-7 heavy cleared to taxi.
|
Well considered posting sir. You beat me
to it!
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
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