Today's Message Index:
----------------------
1. 04:59 AM - Re: Z101 in an RV-10 (A Lumley)
2. 10:20 PM - Re: Re: Z101 in an RV-10 (Robert L. Nuckolls, III)
3. 10:24 PM - Re: Re: Z101 in an RV-10 (Robert L. Nuckolls, III)
4. 10:37 PM - Re: Re: Z101 in an RV-10 (Robert L. Nuckolls, III)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Z101 in an RV-10 |
Kelly, good point about the alternating pumps. Of course normally both pumps will
be operating for takeoff and landing. The bus will be sized for both pumps
to be operating but if the main alternator fails I guess theres no reason for
more than one pump at a time.
John, the 2 grounds will be independently grounded to the same ground bus. I can
show that better in the schematic however. Also I didnt realize that the sense
pin had a parasitic draw when off, is that in the manual? Ill revisit that.
I plan on having the same voltage set points for both regulators. The aux will
be normally off. If the main fails, Ill get a low voltage indication and will
take the main alternator offline manually before engaging the aux alternator.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=503116#503116
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Z101 in an RV-10 |
>
>I'm curious what voltage setpoints have been chosen for the main and
>aux regulators.
Why so expensive a regulator on the aux alternator?
That regulator will see perhaps a hand-full of hours
operation over the lifetime of the airplane under
Plan-B conditions where the need for lv warning
and ov protection is vanishingly small. That
alternator/regulator gets preflight tested each
flight-cycle. I.e. every tank full of fuel.
Since plan-b operations are stand-alone and
short duration, a full-up alternator controller
adds no value . . . only expense and complexity.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Z101 in an RV-10 |
>
>
>Voltage regulators...
>
>Grounds are redundant, should go to separate points, ref install
>manual, failure of
>one is benign and not discoverable in flight or preflight. I put
>physical inspection
>on annual check list.
But not necessary on a metal airplane where the
regulator is mounted on a high integrity airframe
ground . . . dual wired grounds are indicated
for non-metalic airframes where no 'natural',
high quality ground is available.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
Message 4
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Z101 in an RV-10 |
At 09:22 AM 9/8/2021, you wrote:
><andrew.lumley@sympatico.ca>
>
>My calculations are definitely on the conservative side. I
>distributed the loads such that I could fly on the Aux bus and
>Engine busses alone in IMC if I were to lose the primary alternator
>or otherwise had to shut down the main bus.
>
>My aux bus looks like this:
Others have already suggested adjustments
to this list. I would add this suggestion:
Download the form at:
http://www.aeroelectric.com/PPS/Load_Analysis/Blank_Form.pdf
This is similar to the form I and others used in
load analysis required for type certification of
part 23 and 25 aircraft.
Use a page per bus. Make a list of EACH feeder from
the bus that includes function label, protection
size and wire size. Then fill the blank with the
ENERGY CONSUMPTION value for each feeder under
each flight condition.
Intermittent loads are not part of the energy
consumption study. This includes transmit
current of comm radios. Taxi lights, landing
gear pump motors, trim actuators, etc.
The sums at the bottom of the form are used
to validate size selection of each power source
for adequacy to meet energy management design
goals.
`
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|