 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
jd(at)lawsonimaging.ca
Guest
|
 Posted: Wed Nov 01, 2006 6:01 am Post subject: no battery contactor? |
 |
|
Greetings...
I'm just wondering what the justification for eliminating a
battery contactor as per Z17 or Z-20?
Also, if the S700-2-10 split master type switch can be
replaced by a 2-3, per appendix Z, how should it be wired,
exactly?
Thanks...
--
Regards, J.
flying: Zenith STOL CH701/912 C-IGGY, 350 hrs.
building: Sonex #325, Jabiru 3300/6, 85% completed
+-------------------------------------------------------+
| J. Davis, M.Sc. | (computer science) |
| *NIX consulting, SysAdmin | jd at lawsonimaging.ca |
| c/o Brandywine Aviation | voice: 519.289.1527 |
| 5507 Irish Dr., Appin, ON | http://www.cleco.ca |
| N42 47.33 W081 36.50 31/13 | 2000+ x 60', elev: 740' |
+-------------------------------------------------------+
To most people the sky is the limit.
To those who love aviation, the sky is home.
Take charge of your attitude. Don't let someone else choose
it for you.
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
 |
nuckollsr(at)cox.net
Guest
|
| Posted: Wed Nov 01, 2006 6:46 am Post subject: no battery contactor? |
|
|
At 08:59 AM 11/1/2006 -0500, you wrote:
| Quote: |
Greetings...
I'm just wondering what the justification for eliminating a battery
contactor as per Z17 or Z-20?
|
The engine drive power sources for a number of small
engines have limited output. The classic battery contactor
implementation consumes 0.7 to 1.0 amps for the
duration of flight. In most cases, there's energy-to-
burn while the main alternator is functioning but
for Rotax and Jabiru engines, this resource is small
(8-18 amps) and a builder may elect to avoid power
losses represented by the installation of a battery
contactor.
Indeed ANY airplane can use a manual switch in lieu
of a contactor . . . but recall that one of the design
goals for a contactor is that when the master switch
is OFF, the amount of hot wiring between battery and
battery switch is minimized.
| Quote: | Also, if the S700-2-10 split master type switch can be replaced by a 2-3,
per appendix Z, how should it be wired, exactly?
|
A 2-3 is not progressive transfer . . . so the battery
and alternator come on and off together. This presents
a problem for conducting battery-only ground ops
where an alternator might come alive even with the engine
not running and load the battery unnecessarily during
ground testing.
If you use a 2-3, the pulling the alternator field
breaker during ground ops takes the place of the
progressive transfer feature of the 2-10 where
the system can be alive on battery only.
Looking at the back of the switch, the 2-3 is
wired just like a 2-10.
Bob . . .
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
|
jd(at)lawsonimaging.ca
Guest
|
| Posted: Thu Nov 02, 2006 7:17 am Post subject: no battery contactor? |
|
|
Thanks, Bob. Clear, concise and timely, as usual ;')
do not archive
Robert L. Nuckolls, III wrote:
| Quote: |
<nuckollsr(at)cox.net>
At 08:59 AM 11/1/2006 -0500, you wrote:
>
>
> Greetings...
>
> I'm just wondering what the justification for eliminating a battery
> contactor as per Z17 or Z-20?
The engine drive power sources for a number of small
engines have limited output. The classic battery contactor
implementation consumes 0.7 to 1.0 amps for the
duration of flight. In most cases, there's energy-to-
burn while the main alternator is functioning but
for Rotax and Jabiru engines, this resource is small
(8-18 amps) and a builder may elect to avoid power
losses represented by the installation of a battery
contactor.
Indeed ANY airplane can use a manual switch in lieu
of a contactor . . . but recall that one of the design
goals for a contactor is that when the master switch
is OFF, the amount of hot wiring between battery and
battery switch is minimized.
> Also, if the S700-2-10 split master type switch can be replaced by a
> 2-3, per appendix Z, how should it be wired, exactly?
A 2-3 is not progressive transfer . . . so the battery
and alternator come on and off together. This presents
a problem for conducting battery-only ground ops
where an alternator might come alive even with the engine
not running and load the battery unnecessarily during
ground testing.
If you use a 2-3, the pulling the alternator field
breaker during ground ops takes the place of the
progressive transfer feature of the 2-10 where
the system can be alive on battery only.
Looking at the back of the switch, the 2-3 is
wired just like a 2-10.
Bob . . .
|
--
Regards, J.
flying: Zenith STOL CH701/912 C-IGGY, 350 hrs.
building: Sonex #325, Jabiru 3300/6, 85% completed
+-------------------------------------------------------+
| J. Davis, M.Sc. | (computer science) |
| *NIX consulting, SysAdmin | jd at lawsonimaging.ca |
| c/o Brandywine Aviation | voice: 519.289.1527 |
| 5507 Irish Dr., Appin, ON | http://www.cleco.ca |
| N42 47.33 W081 36.50 31/13 | 2000+ x 60', elev: 740' |
+-------------------------------------------------------+
To most people the sky is the limit.
To those who love aviation, the sky is home.
Take charge of your attitude. Don't let someone else choose
it for you.
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
