Today's Message Index:
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0. 12:28 AM - Make Sure You're Listed! List of Contributors Coming Soon! (Matt Dralle)
1. 06:31 AM - Re: kitfox /rotax 912 wiring diagram (variation on Z-16) (user9253)
2. 06:42 AM - Re: kitfox /rotax 912 wiring diagram (variation on Z-16) (user9253)
3. 09:25 AM - Re: Re: kitfox /rotax 912 wiring diagram (variation on Z-16) (Robert L. Nuckolls, III)
4. 09:27 AM - Re: Re: Garmin G3X Autopliot Auto Trim with Big Trim Motor (Robert L. Nuckolls, III)
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Subject: | Make Sure You're Listed! List of Contributors Coming |
Soon!
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Subject: | Re: kitfox /rotax 912 wiring diagram (variation on |
Z-16)
Sacha,
The output of the dynamo goes through a 5 amp circuit breaker which is too small
for a 20 amp dynamo.
The 25 amp main circuit breaker is a single point of failure. When it opens,
everything electrical stops working.
To fix the above two problems, use the 25 amp circuit breaker for the dynamo
circuit. Do not install any main circuit breaker. The pilot can shut off the
master relay in case of smoke in the cockpit.
The 20 amp avionics circuit breaker is another single point of failure. Replace
it with a wire.
I see no reason to have the starter switch on the control stick unless the pilot
intends to make frequent engine starts while flying. It is only a matter
of time before the start button is accidentally pushed when the engine is already
running.
If anyone disagrees with the above, please speak up. It will not hurt my feelings
and I want Sacha to have good advice.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=414324#414324
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Subject: | Re: kitfox /rotax 912 wiring diagram (variation on |
Z-16)
Sacha,
I was looking at the wrong schematic, Kitfox Diagram 0.6.pdf, my mistake.
I should have been looking at Kitfox_Proposed_Diagram_1.23.pdf.
Even so, the dynamo output is still going though a 5 amp breaker. And the start
switch is still on the control stick.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=414327#414327
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Subject: | Re: kitfox /rotax 912 wiring diagram (variation |
on Z-16)
At 08:41 AM 11/27/2013, you wrote:
Sacha,
I was looking at the wrong schematic, Kitfox Diagram 0.6.pdf, my mistake.
I should have been looking at Kitfox_Proposed_Diagram_1.23.pdf.
Even so, the dynamo output is still going though a 5 amp
breaker. And the start switch is still on the control stick.
Joe
Joe offers some salient observations. I'm pleased that you've
taken a run at the AutoCAD flavored gauntlet!
As you evolve your plan for this airplane, consider refining
your drawings to be less like schematics and more like wiring
diagrams. If you study the drawings I've posted you will discover
that they look more like the sketch on the left where the
END of each wire, i.e. the location of each termination is defined
both electrically and physically.
Schematics are entirely suited to describing how a
thing works but its a good idea to include information
on just how it all goes together too.
Emacs!
Additional points of interest from your draft:
The battery bus is generally located very close to the
battery contactor. Feeder from the battery to battery
bus is short and no protection is necessary.
Your e-bus loads include a lot of stuff that seems
to go beyond the needs for en route, battery only
endurance. In other words, what is the minimalist
suite of electro-whizzies needed to navigate to
a point of destination airport in sight. After that,
your arrival in one piece is assured . . . you
can close the battery contactor and tax what ever
energy remains in the battery without adding to
your risks.
Consider re-assigning supply points for some
of the items on the avionics bus.
The breaker in the alternator b-lead can be
replaced with an in-line, fuse holder . . .
Emacs!
and 30A fuse. The b-lead fuse can then
be located right next to the battery's
connection with the battery contactor.
The 5A "alternator breaker" is actually
a CONTROL breaker included to accommodate
the crowbar OV protection system.
Not sure stick-grip starter buttons are a good
idea . . . but if you do incorporate them
into the system, make sure your starter
contactor coil currents are not overly
antagonistic to the switches. As I outlined
in my essay on two-stage, starter-mounted
solenoids, the pull-in currents carried
buy the starter button are pretty scary . . .
hence the advice for a stand-alone, automotive
starter contactor with MUCH more benign
current draws . . . but even these are on
the order of 5A . . . and should probably
be wired with 20AWG wire to insure strong
pull-in. Contactors are most abused by soggy
pull-in current. More contactors have been
burned up by nearly dead batteries than by
healthy, fully charged batteries.
Recommend you use panel mounted, robust
button only and wire with 20AWG wire from
a protected feeder . . . you don't show a
'starter' breaker or fuse.
Looks like a great starting point . . . let's
continue to discuss its refinement.
Bob . . .
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Subject: | Re: Garmin G3X Autopliot Auto Trim with Big Trim |
Motor
At 10:44 PM 11/26/2013, you wrote:
><tim@aircraftersllc.com>
Sure. Will this project include a wheel-master disconnect
switch?
Bob . . .
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