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pinetownd(at)volcano.net
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 Posted: Mon Jan 09, 2006 7:47 pm Post subject: Load Analysis |
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Greetings,
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 Load Analysis
Fuse
Typ Amps
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Bret Smith
Joined: 09 Jan 2006
Posts: 178
Location: Mineral Bluff, GA
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| Posted: Wed Jan 11, 2006 7:27 pm Post subject: Load Analysis |
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Dennis,
I fly/live in the North Georgia mountains and consider the fuel boost pump
"essential" to safe flight. I have always used the FBP during takeoff/climb
then switched off. My "Before Landing" Checklist includes "Fuel Boost Pump-
ON". It may not be essential for others but it reduces the "pucker factor"
for me knowing it is available.
Others may disagree, but I am designing my Load Analysis to keep the juices
flowing.
Bret Smith
Mineral Bluff, GA
www.FlightInnovations.com
--
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Bret Smith
RV-9A (Emp) |
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deej(at)deej.net
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| Posted: Wed Jan 11, 2006 7:48 pm Post subject: Load Analysis |
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Bret Smith wrote:
| Quote: | I fly/live in the North Georgia mountains and consider the fuel boost pump
"essential" to safe flight. I have always used the FBP during takeoff/climb
then switched off. My "Before Landing" Checklist includes "Fuel Boost Pump-
ON". It may not be essential for others but it reduces the "pucker factor"
for me knowing it is available.
|
Hi Bret,
I follow the same procedure for take-off and landing.
However, one thing that I considered is that the boost pump
is really a backup to the main pump (in my case a mechanical
pump), and the "battery" or essential bus is really just a
backup in case the main bus fails. Realistically, what
are the chances that both the main bus AND the main fuel pump
are going to fail at the same time? If you are on the ground, and
one fails, you aren't going to take off (or shouldn't anyway).
If you are flying, and either one fails, you land as soon as
practical, and you should be able to land just fine without
the boost pump since it is just a backup and not really
essential to the plane flying. That's what went through my head
anyways... 
The wonderful thing about it is that neither
approach is wrong.
-Dj
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nuckollsr(at)cox.net
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| Posted: Thu Jan 12, 2006 3:55 am Post subject: Load Analysis |
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At 06:41 PM 1/11/2006 -0800, you wrote:
| Quote: |
<pinetownd(at)volcano.net>
Bret Smith wrote:
>
>
> Dennis,
>
> Looks good. I plan to put the Fuel Boost Pump on the Battery Bus
though. I
> will be putting the Transponder and Encoder and your Chelton display #2 on
> the Main bus and free up some amps on the Endurance bus. The E-Bus should
> only have the basic instruments to help you get safely on the ground.
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May I suggest that the e-bus is to get you comfortably to
airport in sight? After your comfortable arrival is assured,
bring the main bus back up. If you have a small aux alternator,
100% of the battery should be available to get you on the ground.
If you don't have a second alternator, even then, the prudent
design and use of the e-bus should leave you enough snort for
the last few minutes of flight with more goodies running . . . but
even if it doesn't, it shouldn't matter.
Bob . . .
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Bret Smith
Joined: 09 Jan 2006
Posts: 178
Location: Mineral Bluff, GA
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| Posted: Thu Jan 12, 2006 7:39 am Post subject: Load Analysis |
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Hi Dj,
It might seem overly cautious but since I will be running a fuel-injected
engine, my thought was that the fuel boost pump would be more critical than
for a carbureted engine... Even with a mechanical fuel pump.
Bret
---
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_________________
Bret Smith
RV-9A (Emp) |
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