Today's Message Index:
----------------------
1. 06:25 AM - Re: Field of grounds with local bat ground (floridawing)
2. 09:28 AM - Subject: Re: How does the Ducatti rectifier/regulator work? (Robert L. Nuckolls, III)
3. 09:52 AM - Rotax PM regulator (C&K)
4. 03:36 PM - Order (Richard Girard)
5. 03:51 PM - Re: Field of grounds with local bat ground (Robert L. Nuckolls, III)
6. 03:52 PM - Re: Re: Field of grounds with local bat ground (Robert L. Nuckolls, III)
7. 04:06 PM - Re: Order (Larry Mac Donald)
8. 06:47 PM - Re: Field of grounds with local bat ground (Jim Kale)
9. 09:06 PM - Re: Field of grounds with local bat ground (floridawing)
10. 09:47 PM - Re: Re: Field of grounds with local bat ground (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: Field of grounds with local bat ground |
Thank you everyone for the information!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=436522#436522
Message 2
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| Subject: | Re: How does the Ducatti rectifier/regulator |
work?
Subject: AeroElectric-List: Re: How does the Ducatti rectifier/regulator work?
From: "Eric M. Jones" <emjones@charter.net>
I hesitate to inject my questions about the schematic of the Ducati
dynamo regulator. But what is that little unlabeled zener diode
feeding the base of the BF493S?
And why does this look like an alternator regulator instead of a DC
dynamo regulator? What am I missing?
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net
It has a lot in common with a wound-field regulator.
See attached for an exemplar wound field regulator
from 'back in the day' . . .
The zener in the Ducati schematic is the regulation
voltage reference serving the same purpose as D12
in the attached schematic. Noodle through the same
rise-fall/on-off effects in the Ducati schematic
and you will see that perturbations in bus voltage
as sensed by the Ducati regulator causes a
programmed triggering of the SCRs in the gated,
bridge rectifier with the effect of throttling
Dynamo energy about the regulator's set-point
voltage.
Bob . . .
Message 3
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| Subject: | Rotax PM regulator |
There are a couple of interesting quotes from Hawker (on the
www.aero-hesbaye site) saying their Battery life is shortened by
charging ripple. The link below seems to validate the statement.
http://www.cdtechno.com/pdf/ref/41_2131_0212.pdf
Makes me curious whether a large capacitor in the PM charging circuit
might increase battery life a bit.
Ken
"The power being transmitted per burst, voltage ripples are more
important. This can affect all powered systems and instruments but it is
the battery that will suffer the most. To avoid premature aging, Hawker
advocates RMS voltage ripple of less than 1% (battery not connected) ..."
On 01/01/2015 3:38 PM, D L Josephson wrote:
> <dlj04@josephson.com>
>
> It looks like an alternator regulator because that's what it is. The
> output from the stator coils is single phase AC.
>
> There are many attempts online at drawing out the schematic of the
> existing unit (it helps to search with the correct spelling of Ducati)
> but I think the most complete one is in Gilles Thesee's
> http://contrails.free.fr/elec_ducati_en.php. There is another website
> in Belgium that has some of Gilles' earlier work, with some SPICE
> simulations of the waveforms at
> http://www.aero-hesbaye.be/circuit_elec.htm. Google Translate does a
> good enough job if you don't have any French.
>
>
Message 4
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Bob, Would you please contact me off forum, I do not have a current email
address for you, sorry.
Rick Girard
do not archive
--
Believe those who are seeking the truth, doubt those who find it.
-Andre Gide
Message 5
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| Subject: | Field of grounds with local bat ground |
At 19:01 2015-01-01, you wrote:
>
>Grounds can be tricky on composite or wood airplanes. It is easy to get
>different parts of the airplane with grounds not being well bonded to each
>other. In that case, grounds can have different voltages on them and you
>get what is commonly referred to as GROUND LOOPS. All sorts of funny things
>happen to electrical equipment which don't want to operate like they should.
>It is extremely difficult to trace the problems. Be very careful to have
>all ground points bonded to each other very well with redundant paths if
>possible. On metal airplanes, grounds are less difficult, but any metal
>corrosion can cause the same problems.
Actually, DC POWER grounding in composite airplanes is stone simple.
See chapter 15 of the 'Connection.
BONDING for purposes of achieving grounds at radio frequencies
and issues of LIGHTNING protection are another matter entirely
. . . usually ignored in OBAM aircraft as physically, economically
and operationally impractical. Adding the necessary and useful
ground plane under comm and xponder antennas is generally
all that's required . . . also stone simple . . . see
chapter 13 . . .
Bob . . .
Message 6
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| Subject: | Re: Field of grounds with local bat ground |
At 15:01 2015-01-01, you wrote:
>
>Thank you Vern and Charlie. Would I be better off adding a second
>ground strap to the engine and running it up to the field of grounds
>on the firewall or should I only use the one strap I have but remove
>the end attached to the engine mount and attach it instead to the
>field of grounds on the firewall? Thank you!
Avoid burdening engine mount structure with
electrical system duties. Single engine ground
to your fire wall mounted 'forest of grounds'
is recommended.
Bob . . .
Message 7
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On Jan 2, 2015, at 6:33 PM, Richard Girard wrote:
> Bob, Would you please contact me off forum, I do not have a current email address
for you, sorry.
>
> Rick Girard
> do not archive
>
Hi Richard.
It's Larry Mac Donald
lm4@juno.com
____________________________________________________________
Fast, Secure, NetZero 4G Mobile Broadband. Try it.
http://www.netzero.net/?refcd=NZINTISP0512T4GOUT2
Message 8
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| Subject: | Field of grounds with local bat ground |
It is only STONE SIMPLE if one knows where to get the information, can
understand and apply the information. Thank you for the reference.
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: Friday, January 2, 2015 5:49 PM
Subject: RE: AeroElectric-List: Field of grounds with local bat ground
--> <nuckolls.bob@aeroelectric.com>
At 19:01 2015-01-01, you wrote:
>
>Grounds can be tricky on composite or wood airplanes. It is easy to
>get different parts of the airplane with grounds not being well bonded
>to each other. In that case, grounds can have different voltages on
>them and you get what is commonly referred to as GROUND LOOPS. All
>sorts of funny things happen to electrical equipment which don't want to
operate like they should.
>It is extremely difficult to trace the problems. Be very careful to
>have all ground points bonded to each other very well with redundant
>paths if possible. On metal airplanes, grounds are less difficult, but
>any metal corrosion can cause the same problems.
Actually, DC POWER grounding in composite airplanes is stone simple.
See chapter 15 of the 'Connection.
BONDING for purposes of achieving grounds at radio frequencies
and issues of LIGHTNING protection are another matter entirely
. . . usually ignored in OBAM aircraft as physically, economically
and operationally impractical. Adding the necessary and useful
ground plane under comm and xponder antennas is generally
all that's required . . . also stone simple . . . see
chapter 13 . . .
Bob . . .
Message 9
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| Subject: | Re: Field of grounds with local bat ground |
Hi Bob, thank you. I will relocate the ground on my Rocket from the engine mount
to the firewall with a field of grounds. The battery is still mounted in the
back for W&B with a local ground.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=436556#436556
Message 10
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| Subject: | Re: Field of grounds with local bat ground |
At 23:05 2015-01-02, you wrote:
>
>Hi Bob, thank you. I will relocate the ground on my Rocket from the
>engine mount to the firewall with a field of grounds. The battery is
>still mounted in the back for W&B with a local ground.
Sounds like a plan . . .
Bob . . .
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