Today's Message Index:
----------------------
1. 06:18 AM - Re: Engine Ground (Charlie England)
2. 07:11 AM - Re: Engine Ground (johnbright)
3. 07:15 AM - LR3-14 regulator, why for OEM alternators only (johnbright)
4. 07:43 AM - Re: Vertical Power VP-100 opinions ? (donjohnston)
5. 09:53 AM - Perihelion Design (speedy11@aol.com)
6. 10:53 AM - Re: Perihelion Design (johnbright)
7. 12:05 PM - Re: Perihelion Design (speedy11)
8. 01:02 PM - Wiring of the S704 in Z101 (prestonkavanagh)
Message 1
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| Subject: | Re: Engine Ground |
On Sun, Jan 17, 2021 at 4:17 PM bcone1381 <bcone1964@gmail.com> wrote:
>
> In AEC book p. 5-3 instructs to install a fat ground wire from the battery
> minus to the firewall ground stud, then a braided bonded jumper from the
> ground stud to the crankcase.....additionally
>
> AEC P.5-4 suggest Grounding the Battery directly to the crankcase a wise
> idea.
>
> Those are two different grounding methods
>
> Q 1. Is it suggesting to install two engine grounds for redundancy?
> Q 2. I don't understand the use of a braided jumper cable, and wonder if
> it s a poor practice to use 4AWG flexible welding cable for engine ground?
>
> --------
> Brooks Cone
> Bearhawk Patrol Kit
>
If the battery is on the firewall, running the engine ground direct to the
bat neg or to the firewall gnd is electrically the same (excepting the few
micro-ohms in extra cable length). If the battery is in the aft fuselage,
there'd be a *big* difference in weight to make two 'fat' runs. Some
batteries make it fairly difficult to install more than one terminal on
each post, so that can also drive decision making.
A lot of guys install two engine grounds, for redundancy. Probably a waste
of weight for a 'conventional' installation, but if the engine is
electrically dependent (electronic injection or dual electronic ignitions),
it might make sense. I had a car once that had cranking problems for years,
and I finally discovered that the factory authorized dealership had left
the engine ground strap unattached after maintenance on the car. Discovered
it when I had the hood up, and a friend cranking the engine. Car had a
cable-actuated clutch, and I saw the clutch cable start smoking while the
starter was running.
Braided ground is a bit more flexible than welding cable, but welding cable
is flexible enough, and has the added advantage of minimizing abrasion
risk, if other FWF items happen to come in contact with it (shouldn't
happen, but....). Has the downside of the weight of the insulation, if
you're counting ounces. A lot of us use welding cable for engine grounds.
FWIW,
Charlie
Message 2
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| Subject: | Re: Engine Ground |
bcone1381 wrote:
> ... Q 1. Is it suggesting to install two engine grounds for redundancy?
Two engine grounds eliminates an SPOF for the alternator(s) and starter. If using
dual grounds, preflight will not detect if one is broken so there needs to
be periodic inspection.
The EFI+I I know well is SDS. The EFI+I system does not use the engine as a ground
path but of course losing the alternator(s) means you're operating on battery
capacity.
--------
John Bright, RV-6A, at FWF, O-360
Z-101 single batt dual alt SDS EM-5-F.
john_s_bright@yahoo.com, Newport News, Va
https://docs.google.com/document/d/1YOtPiA3AdUsQEYR4nodBESNAo21rxdnx4pFs7VxXfuI/edit?usp=sharing
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500313#500313
Message 3
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| Subject: | LR3-14 regulator, why for OEM alternators only |
I don't need to know but I'm curious. Why does the LR3-28 regulator work with "OEM
28v Alternators" but not with B&C alternators?
--------
John Bright, RV-6A, at FWF, O-360
Z-101 single batt dual alt SDS EM-5-F.
john_s_bright@yahoo.com, Newport News, Va
https://docs.google.com/document/d/1YOtPiA3AdUsQEYR4nodBESNAo21rxdnx4pFs7VxXfuI/edit?usp=sharing
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500315#500315
Message 4
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| Subject: | Re: Vertical Power VP-100 opinions ? |
I would advise against it.
>From Vertical Power back in 2015.
> Product obsolescence usually brings angst with both customers and their supplier.
We at Astronics Ballard Technology had an unusual situation with the acquisition
of the Vertical Power products. As many of you may know, we acquired only
the VP-X Sport and the VP-X Pro products, plus bins and boxes of all kinds
of parts. As a service to the community, we continued to provide repair support
for already obsolete products such as the VP-50/VP-100/VP-200 whenever possible.
However, we are now out of most the useable parts and many are no longer
attainable. Therefore, we are discontinuing factory service support for these
already obsoleted units. If you have one of these units and would like to upgrade
to a VP-Pro, please contact Chad Jensen to discuss options.
If you want an electronic power distribution system, I would suggest the VPX.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500316#500316
Message 5
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| Subject: | Perihelion Design |
Does anyone know if Eric shut down his=C2-Perihelion=C2-Design web site
?I tried going to the site but could not connect.Stan SutterfieldDaytona Be
ach
Message 6
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| Subject: | Re: Perihelion Design |
works for me
http://www.periheliondesign.com/
--------
John Bright, RV-6A, at FWF, O-360
Z-101 single batt dual alt SDS EM-5-F.
john_s_bright@yahoo.com, Newport News, Va
https://docs.google.com/document/d/1YOtPiA3AdUsQEYR4nodBESNAo21rxdnx4pFs7VxXfuI/edit?usp=sharing
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500320#500320
Message 7
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| Subject: | Re: Perihelion Design |
John - thanks for your reply. I must have misspelled the web site name.
Stan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500321#500321
Message 8
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| Subject: | Wiring of the S704 in Z101 |
Over the weekend I figured out a detail of the Z101 diagram - how to wire the S704
relay. See attached.
In the Z101 detail Bob mirrors the expected flow through a relay. Normally power
comes in the COM and goes out through either the NC or (when the coil is activated)
the NO. Here power is sitting in the NO ready to flow to the device
through the COM. It's elegant and creative. Or at least I found it so.
--------
PBK3
PA-12, BD-4, RV6a, gliders
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500322#500322
Attachments:
http://forums.matronics.com//files/wiring_of_the_s704_1_relay_771.docx
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