Today's Message Index:
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1. 07:01 AM - Re: kitfox /rotax 912 wiring diagram (variation on Z-16) (nuckollsr)
2. 08:52 AM - Re: Flow indicator (jonlaury)
3. 10:06 AM - Re: Re: kitfox /rotax 912 wiring diagram (variation on Z-16) (Sacha)
4. 11:43 AM - Re: Re: kitfox /rotax 912 wiring diagram (variation on Z-16) (Ken)
5. 12:18 PM - Re: Re: kitfox /rotax 912 wiring diagram (variation on Z-16) (Sacha)
6. 02:17 PM - Re: Registering a non-TC in the UK (Bill Allen)
7. 02:24 PM - Re: kitfox /rotax 912 wiring diagram (variation on Z-16) (user9253)
8. 02:42 PM - Re: Re: Garmin G3X Autopliot Auto Trim with Big Trim Motor (Robert L. Nuckolls, III)
9. 09:09 PM - Unprotected Feeder in Z Drawings (Jeff Luckey)
Message 1
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| Subject: | Re: kitfox /rotax 912 wiring diagram (variation on |
Z-16)
> Sacha's schematic has two of those 22,000 microfarad capacitors, one on each
side of the alternator relay. I questioned the need for two of them.
Good eye. I should have seen that too. Yeah, if any capacitor is needed, one is
probably enough!
>
> Bob, when you said the large electrolytic capacitor is problematic, did you mean
that they are prone to fail?
No, I intended 'problematic' in that it's not clear that the capacitor is necessary
or functions as the various assertions suggest. I have run bench tests on
the B&C SD-8 alternator and found that adding the capacitor demonstrates no measurable
benefit.
The schematic for the B&C PM regulator-rectifier is not materially different than
the last one I saw for the Rotax-Ducatti R-R . . . the notion that adding a
capacitor 'protects' the regulator if the battery becomes disconnected is not
clear. I'm not suggesting that folks stop installing them . . . but given demonstrated
inability/unwillingness of proponents for adding the capacitor to explain
its function in demonstrable physics gives one pause to wonder.
I'd love to put one of the larger PM machines on the test bench with a Rotax-Ducatti
R-R and explore details of its performance . . . but I've got a lot of more
pressing goals right now.[/quote]
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=414841#414841
Message 2
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| Subject: | Re: Flow indicator |
[quote="ceengland7(at)gmail.com
Hi John,
[/quote]
As I told Bob, I've had some of the Gems detectors in my parts drawer
for years, but have never tested them for flow detection. It's great to
hear that you've tested them & found that they work as flow sensors. Now
I know I won't be wasting my time when I install them. :-)
Charlie[/quote]
Charlie,
One caveat is that the Gems sensor in my application indicates 'presence' but not
flow.
John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=414852#414852
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| Subject: | Re: kitfox /rotax 912 wiring diagram (variation |
on Z-16)
Bob, what's a PM machine?
Sacha
On Dec 4, 2013, at 16:00, "nuckollsr" <bob.nuckolls@aeroelectric.com> wrote:
> I'd love to put one of the larger PM machines on the test bench with a Rotax-Ducatti
R-R
Message 4
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| Subject: | Re: kitfox /rotax 912 wiring diagram (variation |
on Z-16)
Permanent Magnet alternator.
Permanent magnets instead of a wire wound field coil.
On 04/12/2013 1:05 PM, Sacha wrote:
>
> Bob, what's a PM machine?
> Sacha
>
Message 5
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| Subject: | Re: kitfox /rotax 912 wiring diagram (variation |
on Z-16)
Thanks Ken
Do not archive
On Dec 4, 2013, at 20:42, Ken <klehman@albedo.net> wrote:
> Permanent Magnet alternator.
> Permanent magnets instead of a wire wound field coil.
Message 6
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| Subject: | Re: Registering a non-TC in the UK |
We think in similar ways Bob.
An aphorism I'm fond of is "forgiveness is easier to obtain than permission"
another is "rules are made for the obedience of fools and the guidance of
wise men"
The problem comes when clever men (administrators and lawyers) are paid to
write rulebooks.
They never get fat from thin rulebooks, and have never been known to say
"these rules are enough. Our work is done. Make us redundant and we'll look
for other work...."
Especially over in 'Yurp, where the feeding frenzy is multiplied by the
number of languages involved.
Bill Allen
( not Tim Allen, - I have a cousin Tim, but he's a farmer :^)
On 4 December 2013 04:58, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> Tim Allen wrote:
>
>
> The strategy seems to be one of "when we have exhausted him with a long
> series of requests, he will go away, but we can never be accused of
> actually denying a request"
>
> Bear in mind that an administrator never lost his job for preventing
> something happening, but could loose employment by approving something
> which later turned out to be an embarrassment. They have no incentive to
> help you.
>
>
> Tim's assertions brought to mind the words of
> Alexis de Tocqueville committed to paper . . .
>
>
> *"After having thus successively taken each member of the community in its
> powerful grasp and fashioned him at will, the supreme power then extends
> its arm over the whole community. It covers the surface of society with a
> network of small complicated rules, minute and uniform, through which the
> most original minds and the most energetic characters cannot penetrate, to
> rise above the crowd. The will of man is not shattered, but softened, bent,
> and guided; men are seldom forced by it to act, but they are constantly
> restrained from acting. Such a power does not destroy, but it prevents
> existence; it does not tyrannize, but it compresses, enervates,
> extinguishes, and stupefies a people, till each nation is reduced to
> nothing better than a flock of timid and industrious animals, of which the
> government is the shepherd." * Alexis reads like an individual who would
> offer some
> really useful conversation over beer and burgers . . .
>
> BTW, I'm presently taking a 20 hr class that purports to
> 'guide' interested individuals in the rigors of compliance
> with yet another boat load of 'recommendations' (DO-330 and
> 331) piled on top of DO-178 which is up to revison C.
>
> A sample quote from one of the reference documents:
>
>
> *To summarize, we found that analyzing the relationship between require-
> ments coverage and model coverage provides a promising means of assessing
> requirements quality. Nevertheless, the effectiveness of this approach is
> highly dependent on the rigor and effectiveness of the coverage metrics
> used, and aware- ness of the pitfalls of structural coverage metrics is
> essential. For instance, in this experiment we found that the UFC metric
> was surprisingly sensitive to the struc- ture of the requirements, and one
> has to ensure that the requirements structure does not hide the complexity
> of conditions for the metric to be effective. * Now THERE's a crystal
> clear illumination of the problem!
> What was it de Tocqueville said?
>
>
> *"Such a power does not destroy, but it prevents existence; it does not
> tyrannize, but it compresses, enervates, extinguishes, and stupefies a
> people . . ." *Methinks he had it pegged 180+ years ago.
>
> Bob . . .
>
> *
>
> *
>
>
Message 7
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| Subject: | Re: kitfox /rotax 912 wiring diagram (variation on |
Z-16)
> what's a PM machine?
Most likely Permanent Magnet alternator, aka dynamo.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=414864#414864
Message 8
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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>
>
>Any thoughts on using transistors in this setup instead of relays?
>
>Thanks,
>
>Tim
>
>--------
>Tim Farrell
>Aircrafters
>831-722-9141
>
Tim, I thought I had responded to this. Are you
still interested in a solid state 'relay deck' for
this application?
Do you plan to have a "stick master disconnect"
switch?
Bob . . .
Message 9
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| Subject: | Unprotected Feeder in Z Drawings |
Bob,=0A=0AI have been reviewing some of the Z drawings in the back of "The
Aeroelectric Connection" and I have a question.- (specifically Z-11, Z-12
, & Z-14)=0A=0AI notice that the 6 awg wire which connects the load side of
the Battery Contactor to the Main Power Distribution bus is not fused.-
That seems like an un-protected feeder and gives me a little heart burn.=0A
=0AI think of the Main Power Distribution bus as the bus bar which runs acr
oss the back of the breakers in my distribution panel which lives in my ins
trument panel.- With the Battery Contactor on the firewall, the run from
it to the distribution panel penetrates the firewall then snakes its way to
the back of my panel.- That #6 wire will be between 6 & 8 feet in length
.=0A=0AWhat happens if that wire gets into trouble along its route.- With
out a fuse it will get very hot and bad things will happen.=0A=0AI'm curiou
s about the criteria used in this design.- Perhaps I'm missing something?
=0A=0ATIA,=0A=0A-Jeff
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