Today's Message Index:
----------------------
0. 12:11 AM - Contributions Down By 17%... (Matt Dralle)
1. 05:35 AM - Re: Z13/8 Rev Q comments (Jeff Page)
2. 10:06 AM - Re: Re: Z13/8 Rev Q comments (B Tomm)
3. 12:41 PM - OV protection for Alt energized contactor (jonlaury)
4. 01:04 PM - Source for fuselink sleeve? (jonlaury)
5. 01:27 PM - Re: Source for fuselink sleeve? (Robert L. Nuckolls, III)
6. 01:27 PM - Re: Source for fuselink sleeve? (Robert Borger)
7. 01:46 PM - Re: Re: Z13/8 Rev Q comments (Robert L. Nuckolls, III)
Message 0
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| Subject: | Contributions Down By 17%... |
Dear Listers,
As of today, Contributions to the Matronics List Fund Raiser are lagging behind
last year at this time by roughly 17%. I have a Fund Raiser each year simply
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All of this costs a fair amount of money, not to mention a significant amount of
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If you enjoy the Lists, please make a Contribution today. I also offer some incentive
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Thank you for your support!
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Message 1
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| Subject: | Re: Z13/8 Rev Q comments |
> Jeff,
>
> If I recall correctly and Bob may confirm, the SD8 aux alt actually puts out
> up to 10mp at the rpm we fly. Further, in a main alternator out scenario,
> this is to be matched to the continuous draw of your minimum equipment list.
> The surge current for transmitting etc can come from the battery.
> Therefore, I would think that the SD8 will be sufficient as I'm doing
> similar as you.
>
> Bevan
> RV7A wiring, not flying yet.
I typically cruise at 2200 rpm. For a Lycoming the pad ratio is
1.3:1. at 2860 rpm, the SD-8 outputs approx 6.2A, which is just a
little shy of what I need. Some items, such as the instrument panel
lights can be turned down or off. The Skyview probably drawsa less
current if it is dimmed as well. The SD-8 will produce more power if
I cruise at a higher rpm. So my Plan B has me doing a little
adjustment to keep the low voltage warning light off.
I would like to include a transponder on my endurance bus, but that
would require the SD-20. More cost and weight for a very unlikely
situation.
Jeff Page
Dream Aircraft Tundra #10
Message 2
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| Subject: | Re: Z13/8 Rev Q comments |
OK,
I stand corrected on the output of the SD-8.
Good info here. I check my E-buss to see if it's less than 6 amp
continuous.
Bevan
RV7A wiring
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Jeff Page
Sent: Monday, November 22, 2010 5:28 AM
Subject: AeroElectric-List: Re: Z13/8 Rev Q comments
> Jeff,
>
> If I recall correctly and Bob may confirm, the SD8 aux alt actually
> puts out up to 10mp at the rpm we fly. Further, in a main alternator
> out scenario, this is to be matched to the continuous draw of your minimum
equipment list.
> The surge current for transmitting etc can come from the battery.
> Therefore, I would think that the SD8 will be sufficient as I'm doing
> similar as you.
>
> Bevan
> RV7A wiring, not flying yet.
I typically cruise at 2200 rpm. For a Lycoming the pad ratio is 1.3:1. at
2860 rpm, the SD-8 outputs approx 6.2A, which is just a little shy of what I
need. Some items, such as the instrument panel lights can be turned down or
off. The Skyview probably drawsa less current if it is dimmed as well. The
SD-8 will produce more power if I cruise at a higher rpm. So my Plan B has
me doing a little adjustment to keep the low voltage warning light off.
I would like to include a transponder on my endurance bus, but that would
require the SD-20. More cost and weight for a very unlikely situation.
Jeff Page
Dream Aircraft Tundra #10
Message 3
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| Subject: | OV protection for Alt energized contactor |
My Stby alternator energizes its contactor, per the attached drawing.
How do I provide OV protection to the circuit with an OVM 14?
Thanks,
John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=320538#320538
Attachments:
http://forums.matronics.com//files/stby_alt_ov_protection_study_417.pdf
Message 4
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| Subject: | Source for fuselink sleeve? |
Does Aerolectric Connection still sell the kits?
Didn't see it in the Products section
J
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=320541#320541
Message 5
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| Subject: | Re: Source for fuselink sleeve? |
At 03:00 PM 11/22/2010, you wrote:
>
>Does Aerolectric Connection still sell the kits?
>Didn't see it in the Products section
I think B&C sells it. It's a Bently-Harris
silicon impregnated fiberglas sleeving.
Were are you intending to use it?
Bob . . .
Message 6
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| Subject: | Re: Source for fuselink sleeve? |
J,
Go to B & C Specialty Products ( http://www.bandc.biz/ ). They have Fusible Link Kits under "Electrical Products" "Circuit Protective Devices"
Check six,
Bob Borger
http://www.europaowners.org/N914XL
Europa XS, Short Wing, Intercooled Rotax 914
rlborger@mac.com
Cel: 817-992-1117
On Nov 22, 2010, at 3:00 PM, jonlaury wrote:
>
> Does Aerolectric Connection still sell the kits?
> Didn't see it in the Products section
>
> J
Message 7
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| Subject: | Re: Z13/8 Rev Q comments |
At 11:10 AM 11/21/2010, you wrote:
>
>Jeff,
>
>If I recall correctly and Bob may confirm, the SD8 aux alt actually puts out
>up to 10mp at the rpm we fly.
Correct . . . sort of . . . the NORMAL manner in which
alternators are rated calls for supporting the bus
a the design set point. Say 14.2 - 14.6 volts. At the
same time, a battery doesn't deliver significant energy
into the system until the bus sags to 12.5 or so volts.
The "normal" rating for the SD-8 is 8A. However, the max load
you can support with an SD-8 without taxing the battery
closer to 10A because the bus voltage can be allowed to sag.
This is why I don't show low-voltage warning on the E-bus.
Even with an SD-8 powering it (as in Z-13/8). A satisfactory
operating design point voltage is probably below the trip
point for a l3v warning light driver.
>Further, in a main alternator out scenario,
>this is to be matched to the continuous draw of your minimum equipment list.
>The surge current for transmitting etc can come from the battery.
>Therefore, I would think that the SD8 will be sufficient as I'm doing
>similar as you.
If we were comfortable with the idea of taxing
a battery for a minimum endurance during alternator
out operations, the act of adding an SD-8 on top
of the battery does not convert the battery's stored
energy into a sacred commodity.
If you needed to support a 13A endurance bus under
some conditions, why not? The points to be pondered
are minute details for how "plan-b" or perhaps even
a "plan-c" are implemented. What preventative
maintenance tests to the battery will be religiously
conducted to insure support for your "worst case"
but planned-for scenario.
Building an OBAM aircraft is a mixed bag. There's
a LOT of planning supported by a lot of understanding
that is NOT covered in a holy-watered POH for your
project.
You're on your own to make sure you've got "the plan" and
understanding that meets your design goals. Well,
not entirely on your own . . . there IS the AeroElectric
List.
This discussion highlights the importance of both
load analysis and failure mode effects that drive
configuration of both hardware and your "plan-b".
Bob . . .
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