Today's Message Index:
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1. 12:00 AM - Re: RV10 primary elec sys wiring (airknot)
2. 12:02 AM - Re: RV10 primary elec sys wiring (airknot)
3. 12:44 AM - Re: RV10 primary elec sys wiring (airknot)
4. 04:05 AM - Re: thermocouple calibration (Gerald Cruz)
5. 04:27 AM - Re: RV10 primary elec sys wiring (user9253)
6. 04:39 AM - Re: RV10 primary elec sys wiring (user9253)
7. 04:45 AM - Re: RV10 primary elec sys wiring (airknot)
8. 09:02 AM - Re: Re: RV10 primary elec sys wiring (Charlie England)
Message 1
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| Subject: | Re: RV10 primary elec sys wiring |
[/quote]
Google says we need permission to see it; sent the request.
Charlie
My apologies - i was sure it is accessable for averyone with the link.
I have double-checked and gave rights to edit:
ELA - https://drive.google.com/file/d/19XBHeM0oGqIDpQcepn1XrqFzVvEpWZq6/view?usp=sharing
Equipment list, source analisys
https://drive.google.com/file/d/1KQJFOoFCRKHqWNgRtfG3JbY6XyPKGQ0d/view?usp=sharing
thank you
Alex
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http://forums.matronics.com/viewtopic.php?p=497813#497813
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| Subject: | Re: RV10 primary elec sys wiring |
[/quote]
Thoughtfully crafted electrical systems do not suffer
emergencies . . .
Bob . . .[/quote]
I mean loss of primary alternator
Alex
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| Subject: | Re: RV10 primary elec sys wiring |
nuckolls.bob(at)aeroelect wrote:
>
> >
> > 3 backup smart battery (TCW IBBS-12V-6AH) max cont loadoad 8 A, intermittent
12 A
> > Engine: Lycoming IO-540-D4A5
>
> With that engine, why are you including a backup
> battery? A 8-10A standby alternator on a vacuum
> pump pad offers UNLIMITED endurance with about
> a 4 pound penalty. I go out of my way to avoid
> adding batteries to a design over and above
> those normally expected to start engines and
> back up the primary alternator.
>
> Do you not PLAN to conduct periodic airworthiness
> checks on the main battery?
>
>
> Bob . . .
I feel the same, even more - i prefer independent buses which a powered from different
power sources plus 2 batteries. as commercial airplanes constructed...
but, unfortunately, I was asked to help built Airplane with equipment already purchased...of
course I can ask for changes ..
Engine is electrically independent -
and my idea was 2 or 3 buses, to construct reliable, redundant but simple system
using all I have:
-Main bus powered from alternator
-Battery bus (so called switched hot battery bus - to avoid battery drain in case
of always hot battery bus), but it have to be powered not from battery under
normal conditions - so only main bus available
-Essential bus that might be normally powered from the Main bus (thru IBBS battery)
and in case of main bus power loss - power from IBBS baterry itself.
Initial idea was to power VHF transciver with its audio control panel.
Another point is to protect equipment during engine start:
For engine start we need 1 Skyview monitor with its periphery operating
Top important question - battery maintenance.
Scheduled servicing will be performed - we will install BatteryMInder charger for
Main battery and will charge IBBS with its charger (separate unit recommended
by TCW).
Due to lack of time - guys want fly asap :) - we will do not install Ground power
subsystem now, but for sure will schedule this upgrade in winter time.
Alex
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| Subject: | Re: thermocouple calibration |
I truly welcome this superb post that you have accommodated us. I guarantee this
would be valuable for the vast majority of the general population. https://royalcbd.com/cbd-vs-thc/
(https://royalcbd.com/cbd-vs-thc/)
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http://forums.matronics.com/viewtopic.php?p=497816#497816
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| Subject: | Re: RV10 primary elec sys wiring |
> Another point is to protect equipment during engine start
Absolutely NO equipment needs to be protected during engine start.
There is no such thing as voltage spikes during starting. That is an old wive's
tale.
Are you going to believe rumors based on 1950's technology or Bob N. who has written
the book on aircraft electrical systems?
Read the following:
http://forums.matronics.com/viewtopic.php?t=16757246&sid=74d855944e77ced507a5bb87d7f9a72f
Avionics Master Switches: Really Necessary?
http://www.aeroelectric.com/articles/avmaster.pdf
--------
Joe Gores
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http://forums.matronics.com/viewtopic.php?p=497817#497817
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| Subject: | Re: RV10 primary elec sys wiring |
> Essential bus that might be normally powered from the Main bus
> (thru IBBS battery) and in case of main bus power loss - power from IBBS baterry
itself.
I do not like the fact that the output of the IBBS battery is protected by one
10 amp fuse. If that fuse blows, everything down steam loses power.
I would not power an essential bus through that backup battery.
The cure is worse than the disease.
--------
Joe Gores
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http://forums.matronics.com/viewtopic.php?p=497819#497819
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| Subject: | Re: RV10 primary elec sys wiring |
user9253 wrote:
>
> > Another point is to protect equipment during engine start
>
> Absolutely NO equipment needs to be protected during engine start.
> There is no such thing as voltage spikes during starting. That is an old wive's
tale.
> Are you going to believe rumors based on 1950's technology or Bob N. who has
written the book on aircraft electrical systems?
> Read the following:
>
> http://forums.matronics.com/viewtopic.php?t=16757246&sid=74d855944e77ced507a5bb87d7f9a72f
>
> Avionics Master Switches: Really Necessary?
> http://www.aeroelectric.com/articles/avmaster.pdf
Agree, thank you. i wrote silly thing. Bob told that Avionics switch is unnecessary
nowadays.
just think about the most wise and safest way of using equipment available.
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http://forums.matronics.com/viewtopic.php?p=497820#497820
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| Subject: | Re: RV10 primary elec sys wiring |
On 8/18/2020 1:58 AM, airknot wrote:
>
> [/quote]
> Google says we need permission to see it; sent the request.
>
> Charlie
>
>
> My apologies - i was sure it is accessable for averyone with the link.
> I have double-checked and gave rights to edit:
> ELA - https://drive.google.com/file/d/19XBHeM0oGqIDpQcepn1XrqFzVvEpWZq6/view?usp=sharing
>
> Equipment list, source analisys
> https://drive.google.com/file/d/1KQJFOoFCRKHqWNgRtfG3JbY6XyPKGQ0d/view?usp=sharing
>
> thank you
> Alex
>
OK, got it. 1st thing I noticed is that you didn't totalize current for
the various phases of flight. Even without looking there, your 'typical'
consumption for everything is only 36 A. I'd look at cruise, with pitot
heat and boost pump included for worst case numbers. Re-examine what
you've included for each phase of flight. ex: Looks like you show 1 A
for the flap motor, for all phases of flight. Also, look carefully at
recommended circuit protection values for each device. ex: Even though
the flap motor may only consume 5 A, IIRC, the docs for it recommend
closer to 15 A for circuit protection due to startup surge.
I suspect that the number for the boost pump number is a bit low. The
automotive injection pumps typically used in a/c boost pumps typically
draw a *minimum* of around 4.5A; most will draw closer to 6A. That draw
doesn't really change with engine power, since they pump the same
quantity of fuel at the same pressure, regardless of flow to the engine
(excess is bypassed back to the inlet). The Walbro pumps (not the one
used by AFP) recommend a 20A circuit protection, due to startup surge
current.
I didn't do a line-by-line analysis, so you can probably find more power
savings.
Charlie
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