Today's Message Index:
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1. 03:52 AM - Re: Request review of Electrical Load Analysis - using Z13/8 ar (plevyakh)
2. 06:30 AM - Re: Re: Request review of Electrical Load Analysis - using Z13/8 ar (Robert L. Nuckolls, III)
3. 06:33 AM - Re: Open squelch (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: Request review of Electrical Load Analysis - using |
Z13/8 ar
Jeff,
Thanks I'll add those items. I'm going to go without the cooling fan initially
and see how the avionics fare. I might have to add later.
For those planning IFR w/ similar equipment....it looks like the LC-60 amp alternator
is a must due to the high current consumption of the pitot heat, navigation,
strobe, and landing lights.
For anyone who has not yet purchased equipment you'll want to buy LED style, and
maybe the Gretz Aero pitot heat system to keep the amps down.
I'm going to switch to the B&C LC-60 amp alternator and plan for a max continuous
electrical load of 80-85% or 48 to 51 amps.
Howard
--------
Howard Plevyak
GlaStar
North Bend, Ohio
hplevyak@mac.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=326839#326839
Message 2
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| Subject: | Re: Request review of Electrical Load Analysis |
- using Z13/8 ar
At 06:48 AM 1/13/2011, you wrote:
>
>Jeff,
>Thanks I'll add those items. I'm going to go without the cooling
>fan initially and see how the avionics fare. I might have to add later.
>
>For those planning IFR w/ similar equipment....it looks like the
>LC-60 amp alternator is a must due to the high current consumption
>of the pitot heat, navigation, strobe, and landing lights.
>
>For anyone who has not yet purchased equipment you'll want to buy
>LED style, and maybe the Gretz Aero pitot heat system to keep the amps down.
>
>I'm going to switch to the B&C LC-60 amp alternator and plan for a
>max continuous electrical load of 80-85% or 48 to 51 amps.
Really that high? Do you run all those things all the time
for any flight condition? Here's an exemplar load-analysis
form I've used for many years.
http://www.aeroelectric.com/PPS/Load_Analysis/Blank_Form.pdf
It set's up a series of flight conditions that comport with
suggestions offered by FAR23.1351(a)(1)(i) that says:i)
"For normal, utility, and acrobatic category airplanes, by an electrical
load analysis or by electrical measurements that account for the electrical
loads applied to the electrical system in probable combinations and for
probable durations"
The operative words are "combinations" and "duration".
Not all things are turned on at any time. The last
detail load analysis I did on a small airplane some
years ago showed a max CONTINUOUS demand of 27 amps
for the worst case flight condition (IFR, pitot heat
ON).
This left 10A plus for battery maintenance with
only a 40A alternator.
The rule of thumb for alternator sizing is to
reserve 25% of total capacity for battery charging
so if you're planning a 60A alternator, you want
to establish operating conditions that do not
demand more than 45A continuous.
Bob . . .
>Howard
>
>--------
>Howard Plevyak
>GlaStar
>North Bend, Ohio
>hplevyak@mac.com
>
>
>Read this topic online here:
>
>http://forums.matronics.com/viewtopic.php?p=326839#326839
>
>
>-----
>No virus found in this message.
>Checked by AVG - www.avg.com
Bob . . .
Message 3
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| Subject: | Re: Open squelch |
Thanks Bob;
When the antenna is disconnected the radio goes silent. I spoke
with both Icom and GRT today. At this point I'm going to leave it as is until
I still have a problem after the panel is installed in the
aircraft. If so GRT indicated they can install some filters on the
video display that may help.
Interesting. I didn't mention it in my earlier
post . . . but the LCD color display panels have
cropped up a number of times before as potentially
serious radiation antagonists. Sounds like GRT
might not fare well in the DO160 qualifications
tests.
Bob . . .
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