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Revised Load Analysis

 
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pinetownd(at)volcano.net
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PostPosted: Tue Jan 10, 2006 5:29 pm    Post subject: Revised Load Analysis Reply with quote


Greetings,
I'm hoping that the formatting survives this time!
This month is wiring month for my Lancair Legacy. My preliminary load analysis
for each electrical bus is presented for review and comment. Composite airplane,
engine in front, 75 amp main alternator, SD-8 aux alternator, single battery,
Z-13/8 all electric on a budget with overweight E-Bus. Chelton Sport glass
cockpit with backups for airspeed, altimeter, and electric attitude indicator
(TruTrak ADI). IFR and night flights anticipated. The "Typ Amps" represents
the typical continuous current in cruise flight.
I'm curious if anyone has comments regarding which components are on each bus.
Battery Bus:
Baggage area dome light 1-2 amps
Clock -
Panel flood lights .5
Map lights .5
Electronic ignition 2
Alternate feed to E-Bus -
Total battery bus loads 4-5 amps
E-Bus:
Elevator trim servo -
Roll & yaw trim servos -
Transponder & altitude encoder 1.5
Audio panel & headsets .4
Gear down lights & O2 regulators -
Engine info system (GRT) .2
Com radio .3 (3.2 max)
Autopilot .5 (2.5 max, including servos)
Instrument panel lights .2
Chelton display #1 2.5
Chelton display #2 2.5
Attitude heading reference sys .2
Total E-Bus loads 9 (14 max)
Main Bus:
Angle of attack indicator .2
Fuel boost pump -
VOR receiver 1
Wingtip position lights (LEDs) ?
Wingtip strobe lights ?
Wing flaps motor -
Taxi light -
Landing light -
Pitot heat - (11 when in use)
Avionics cooling fan .5
Backup electric attitude indicator ?
Normal feed to E-Bus 9 (14 max)
Total Main Bus 16 (42 max)
Other:
Hydraulic pump for landing gear - (40 amp ANL fuse)
Thanks,
Dennis Johnson
Legacy #257, wiring this month


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lhelming(at)sigecom.net
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PostPosted: Wed Jan 11, 2006 5:02 am    Post subject: Revised Load Analysis Reply with quote


I would put the Avionics cooling fan and Chelton display 2 on the main bus
to reduce e-bus load.
"Please use the information and opinions I express with responsibility, and
at your own risk."
L R Helming


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Dennis Johnson



Joined: 10 Jan 2006
Posts: 89
Location: N. Calif.

PostPosted: Wed Jan 11, 2006 6:34 pm    Post subject: Re: Revised Load Analysis Reply with quote


[quote="lhelming(at)sigecom.net"]I would put the Avionics cooling fan and Chelton display 2 on the main bus
to reduce e-bus load."
Thanks for the thoughts! I agree with the cooling fan on the main bus, but I'm not sure about the Chelton display #2, which will be my primary navigation source. I suppose I could engage the autopilot and then switch the Chelton #1 display to the navigation page and then switch back. On the other hand, the display has an off switch, so I could manually turn off display #2 until it was needed.
Good food for thought,
Dennis Johnson


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Bret Smith



Joined: 09 Jan 2006
Posts: 178
Location: Mineral Bluff, GA

PostPosted: Wed Jan 11, 2006 7:12 pm    Post subject: Revised Load Analysis Reply with quote


Can't the Chelton "split-screen"? Show the PFD AND the Map page on the #1
display. Turn off #2 until you are within safe distance to an airport. I
would also put your fuel pump on the Battery Bus.
Bret Smith
Mineral Bluff, GA
www.FlightInnovations.com
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