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nuckolls.bob(at)aeroelect
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 Posted: Mon Jul 16, 2018 6:26 pm Post subject: Fwd: Re: Re: Question for Bob |
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| Quote: | Date: Mon, 16 Jul 2018 20:59:53 -0500
To: aeroelectric-list(at)matronics.com
From: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com>
Subject: Re: Re: Question for Bob
At 05:21 PM 7/16/2018, you wrote:
| Quote: | --> AeroElectric-List message posted by: "Rocketman1988" <Rocketman(at)etczone.com>
Bob
This is just a simple drawing with reference to the Z-14. |
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Okay, I'm getting your thread confused with the
project using the EFII 'bus controller' . . . let
me back up.
| Quote: | | Quote: | The feeders to the "hot" busses are the ones in question. In the RV-10, the 3 contactors are located in the aft fuselage, while I would like the busses to be located forward, with c/b s accessible from the control seat.
Those two wires would each be around 10 feet long... |
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Yes, so now we need to consider the effects of
a failure of one of those relays.
Normally, we would like to have redundant systems
that do not depend on both used-to-be-a-battery
bus powered up.
A battery bus is generally the most reliable source
in the airplane . . . nothing between it and the battery.
Now we've got a piece of hardware there that capable
of killing the whole bus. The consequences of that
are best deduced before first flight . . . not after.
Bob . . .
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Rocketman1988
Joined: 21 Jun 2012
Posts: 63
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| Posted: Tue Jul 17, 2018 7:17 am Post subject: Re: Fwd: Re: Re: Question for Bob |
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Very true.
You posted a reply in another thread that stated battery contactor failures in flight are exceedingly rare. Hypothetically, you could put a battery contactor in the feed line to a forward buss. This contactor would be checked prior to every flight, as the engine could not be started if there was a failure, and the ability to isolate the battery is retained. Given that there would be two separate feeders to that buss, the likelihood of both contactors failing simultaneously would be quite small, leaving the buss powered in the event of a single failure.
Thoughts?
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user9253
Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan
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| Posted: Tue Jul 17, 2018 9:02 am Post subject: Re: Fwd: Re: Re: Question for Bob |
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Rocketman1988,
Your reasoning is valid. The chances of two contactors failing on a single flight are infinitesimal. Infinitesimal is defined as the the amount an aircraft carrier sinks in the water when a fly lands on its deck.
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Joe Gores |
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