Today's Message Index:
----------------------
1. 09:39 AM - Z-14 Question (Mark Steitle)
2. 09:54 AM - Re: Re: AOA Indicator (Sigma Eta Aero)
3. 09:54 AM - Re: Re: AOA Indicator (Sigma Eta Aero)
4. 11:06 AM - Re: Re: AOA Indicator (Robert L. Nuckolls, III)
5. 11:07 AM - Re: Z-14 Question (Robert L. Nuckolls, III)
6. 01:14 PM - FatWire (Eric M. Jones)
7. 01:17 PM - Re: Z-14 Question (Mark Steitle)
8. 02:53 PM - 70amp alt 60amp current limiter (TimRhod@aol.com)
9. 03:58 PM - Re: AOA Indicator (Eric M. Jones)
10. 04:29 PM - Re: FatWire (Greg Young)
11. 05:14 PM - Re: Re: AOA Indicator (Sigma Eta Aero)
12. 05:25 PM - FatWire (Eric M. Jones)
13. 06:32 PM - Re: AOA Indicator and piece-meal development programs (Robert L. Nuckolls, III)
14. 07:16 PM - Re: 70amp alt 60amp current limiter (Robert L. Nuckolls, III)
15. 07:28 PM - Re: Question on Z-14 (Robert L. Nuckolls, III)
16. 10:45 PM - B&C 20 amp vac pad major failure (richard@riley.net)
Message 1
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--> AeroElectric-List message posted by: Mark Steitle <msteitle@mail.utexas.edu>
Bob,
(This is a repeat of a previous inquiry which seems to have been
filtered/dropped/missed. So, as you have instructed, I am re-posting my
question.)
The Z-14 schematic shows a Transient Suppressor tied into the secondary
battery/alternator system. Can you explain what this is and where to go to
buy/build one?
Or, if I have a properly designed electrical system, do I really need a
transient suppressor?
Thank you,
Mark S.
Message 2
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| Subject: | Re: AOA Indicator |
--> AeroElectric-List message posted by: Sigma Eta Aero <sigmatero@yahoo.com>
Bob,
What would be required to make a very basic and as simple as possible solid state
voltage regulator that outputs 5V and how much would the voltage fluctuate?
Joa
---------------------------------
Message 3
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| Subject: | Re: AOA Indicator |
--> AeroElectric-List message posted by: Sigma Eta Aero <sigmatero@yahoo.com>
Bob,
What would be required to make a very basic and as simple as possible solid state
voltage regulator that outputs 5V and how much would the voltage fluctuate?
Joa
---------------------------------
Message 4
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| Subject: | Re: AOA Indicator |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 09:54 AM 9/22/2003 -0700, you wrote:
>--> AeroElectric-List message posted by: Sigma Eta Aero <sigmatero@yahoo.com>
>
>Bob,
>
>
>What would be required to make a very basic and as simple as possible
>solid state voltage regulator that outputs 5V and how much would the
>voltage fluctuate?
See http://www.national.com/ds.cgi/LM/LM1084.pdf for
specs on a low cost, later-day 3-terminal regulator.
There's a whole family of these devices. Radio Shack
can probably sell you an MC7805 (276-1770) which has
the following chracteristics:
http://www.fairchildsemi.com/ds/MC/MC7805.pdf
Bob . . .
Message 5
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| Subject: | Re: Z-14 Question |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 11:37 AM 9/22/2003 -0500, you wrote:
>--> AeroElectric-List message posted by: Mark Steitle
><msteitle@mail.utexas.edu>
>
>Bob,
>
>(This is a repeat of a previous inquiry which seems to have been
>filtered/dropped/missed. So, as you have instructed, I am re-posting my
>question.)
you did good . . .
>The Z-14 schematic shows a Transient Suppressor tied into the secondary
>battery/alternator system. Can you explain what this is and where to go to
>buy/build one?
Ignore it.
>Or, if I have a properly designed electrical system, do I really need a
>transient suppressor?
This is correct. That was included at the request of a builder
who was worrying too much and should have been removed before
I published the drawing.
Bob . . .
Message 6
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--> AeroElectric-List message posted by: "Eric M. Jones" <emjones@charter.net>
Today I placed THE ORDER for 1,445,472 feet Copper Clad Aluminum wire. This
is sufficient to make 5,434 feet of 1/0 CCA cable (and much more of the
smaller stuff). I intend to sell AWG 1/0, AWG 2, and AWG 4. Custom
configurations like Y's, split-offs, embedded control wires, etc. are easy
to do.
The insulation is still in the works, samples coming in a few days. The
insulation should also be far lighter than the usual stuff you can buy. see
the particulars at--
www.periheliondesign.com/fatwiremanual.pdf
Please keep me in mind.
Please.................!
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge MA 01550-2705
Phone (508) 764-2072
Email: emjones@charter.net
Message 7
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| Subject: | Re: Z-14 Question |
--> AeroElectric-List message posted by: Mark Steitle <msteitle@mail.utexas.edu>
Bob,
Thanks, I figured that from reading your past postings, but wanted to be
sure before I deleted it.
As always, your feedback is appreciated.
Thank you,
Mark S.
At 01:07 PM 9/22/2003 -0500, you wrote:
>--> AeroElectric-List message posted by: "Robert L. Nuckolls, III"
><bob.nuckolls@cox.net>
>
>At 11:37 AM 9/22/2003 -0500, you wrote:
> >--> AeroElectric-List message posted by: Mark Steitle
> ><msteitle@mail.utexas.edu>
> >
> >Bob,
> >
> >(This is a repeat of a previous inquiry which seems to have been
> >filtered/dropped/missed. So, as you have instructed, I am re-posting my
> >question.)
>
> you did good . . .
>
>
> >The Z-14 schematic shows a Transient Suppressor tied into the secondary
> >battery/alternator system. Can you explain what this is and where to go to
> >buy/build one?
>
> Ignore it.
>
>
> >Or, if I have a properly designed electrical system, do I really need a
> >transient suppressor?
>
> This is correct. That was included at the request of a builder
> who was worrying too much and should have been removed before
> I published the drawing.
>
> Bob . . .
>
>
Message 8
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| Subject: | 70amp alt 60amp current limiter |
--> AeroElectric-List message posted by: TimRhod@aol.com
Bob: I just found out that my new cont IO550 has a 70 amp alternator. Am I
still alright with a 60amp current limiter I bought from B&C? Thanks Tim
Message 9
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| Subject: | Re: AOA Indicator |
--> AeroElectric-List message posted by: "Eric M. Jones" <emjones@charter.net>
A voltage regulator is not required in the circuit I proposed.
The hall effect rotary position sensor is very cheap and will do the trick,
granted, with the water seal removed, and maybe new bearings (you wouldn't
want to modify ten thousand of these). The torque is not an issue...you go
as low torque as you can, then make the vane big enough to work, then adjust
the weight on the vane until it mimics reality. Make the vane of foam, then
if it blows off it can't hurt the wing. (Black humor here).
If you have nothing else to do please see
www.periheliondesign.com/rubberbands.jpg and please don't write to me or Bob
that it's off-topic.
Regards,
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge MA 01550-2705
Phone (508) 764-2072
Email: emjones@charter.net
"I only regret my economies."
Reynolds Price
Message 10
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--> AeroElectric-List message posted by: "Greg Young" <gyoung@cs-sol.com>
Do I have this right? You're going to take a bazillion strands of tiny
aluminum wire, twist it all together yourself, put your own insulation on it
and sell it as fat cables? Things that make you go hmmmm...
Regards,
Greg Young - Houston (DWH)
RV-6 N6GY ...project Phoenix
Navion N5221K - just an XXL RV-6A
>
> --> AeroElectric-List message posted by: "Eric M. Jones"
> --> <emjones@charter.net>
>
> Today I placed THE ORDER for 1,445,472 feet Copper Clad
> Aluminum wire. This is sufficient to make 5,434 feet of 1/0
> CCA cable (and much more of the smaller stuff). I intend to
> sell AWG 1/0, AWG 2, and AWG 4. Custom configurations like
> Y's, split-offs, embedded control wires, etc. are easy to do.
>
> The insulation is still in the works, samples coming in a few
> days. The insulation should also be far lighter than the
> usual stuff you can buy. see the particulars at--
>
> www.periheliondesign.com/fatwiremanual.pdf
>
> Please keep me in mind.
> Please.................!
> Eric M. Jones
> www.PerihelionDesign.com
> 113 Brentwood Drive
> Southbridge MA 01550-2705
> Phone (508) 764-2072
> Email: emjones@charter.net
Message 11
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| Subject: | Re: AOA Indicator |
--> AeroElectric-List message posted by: Sigma Eta Aero <sigmatero@yahoo.com>
Thanks for the reply Bob. Would the two capacitors (input and output) shown in
the application schematics for the MC7805 be needed for this? Do you think
this would work with the other hardware to produce a working angle of attack indicator?
What am I missing?
Thanks.
Joa
+++++++++++++++++++++++++++++
See http://www.national.com/ds.cgi/LM/LM1084.pdf for
specs on a low cost, later-day 3-terminal regulator.
There's a whole family of these devices. Radio Shack
can probably sell you an MC7805 (276-1770) which has
the following chracteristics:
http://www.fairchildsemi.com/ds/MC/MC7805.pdf
+++++++++++++++++++++++++++++++
---------------------------------
Message 12
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--> AeroElectric-List message posted by: "Eric M. Jones" <emjones@charter.net>
Piece of Cake....
Eric
Message 13
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| Subject: | Re: AOA Indicator and piece-meal development programs |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 05:13 PM 9/22/2003 -0700, you wrote:
>--> AeroElectric-List message posted by: Sigma Eta Aero <sigmatero@yahoo.com>
>
>Thanks for the reply Bob. Would the two capacitors (input and output)
>shown in the application schematics for the MC7805 be needed for
>this? Do you think this would work with the other hardware to produce a
>working angle of attack indicator? What am I missing?
>
>Thanks.
The capacitors are necessary for legacy devices
like the MC7805, I think most of the newer devices
will perform without them. I generally include them
anyhow for reasons other than regulator performance.
Are you sure you want to tackle an electro-mechanical
AOA system for your first crack at it? If you're getting
you feet wet for the first time in electronic circuit
design, layout, fabrication, troublshooting, calibration
and operation stacked on top of fabricating and proofing
an AOA sensor, -AND- expecting to achieve stability
and accuracy in a flight instrument that will let you skate
up to the edge of the ice with confidence . . . . perhaps
I can suggest ways to mitigate risk.
Check out http://www.snyder.on.ca/pages/lri.htm
The link from the page cited to a drawing for the
probe is broken . . . but I've copied it to my
server here:
http://216.55.140.222/temp/angle_of_attack.jpg
Follow this link to Ebay where you'll find a bunch
of Magnehelic super-sensitive differential pressure
instruments.
http://search.ebay.com/search/search.dll?MfcISAPICommand=GetResult&SortProperty=MetaEndSort&ht=1&query=magnehelic
If this link doesn't come through the list-server intact,
just go directly to ebay and search on "magnehelic"
The "sweet spot" for calibrating this AOA system is at
about 0.4" H20 . . . so any gage 1" to 5" H20 full scale
would be useful in this application.
Neat thing about this system is that it is non-electric,
with one moving part (instrument pointer). Only
down-side I see is the rather chunky, non-aviation
looking instrument . . . but like one's homely sister
who never has dates but makes straight A's in everything,
there is great value beyond appearances.
I'm paraphrasing remarks credited to Burt Rutan wherein
he noted, "Never test a new engine on a new airframe.
Always bolt a stoggy ol' Lyc to your new winged thing
of beauty, and use something like a C-172 as a test
bed for a new engine. It is best to limit the size, kind
and number of dragons you take flying with you."
See if you can make the probe work with a known
instrumentation technology. If that plays, then do some
fiddling with a low-pressure sensor that might even
drive another analog display of some kind . . .
in parallel with the Magnehelic instrument to bolster
confidence in your design. When your sensor is working
well, go for the whippy bar graph or whatever. When
that's done, lets talk about how to fabricate it in
a manner that provides both mechanical and electrical
robustness such that this new instrument is likely to
still be functional the day your airplane is deemed
un-airworthy and ready to be parted out or scrapped.
This kind of programmed, one-step-at-a-time development
effort will yield superior results while keeping you
out of the icewater when you go skating up to the edge. . .
Bob . . .
--------------------------------------------
( Knowing about a thing is different than )
( understanding it. One can know a lot )
( and still understand nothing. )
( C.F. Kettering )
--------------------------------------------
Message 14
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| Subject: | Re: 70amp alt 60amp current limiter |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 05:52 PM 9/22/2003 -0400, you wrote:
>--> AeroElectric-List message posted by: TimRhod@aol.com
>
>Bob: I just found out that my new cont IO550 has a 70 amp alternator. Am I
>still alright with a 60amp current limiter I bought from B&C? Thanks Tim
you bet. Take a peek at the specs for the ANL limiters
at http://www.bussmann.com/library/bifs/2024.PDF
It doesn't have a curve for ANL60 but there's one for
ANL50 . . . note that at even 80A from your "cold" alternator,
the ANL50 would hang in there okay.
Bob . . .
Message 15
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| Subject: | Re: Question on Z-14 |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 01:44 PM 9/18/2003 -0400, you wrote:
>--> AeroElectric-List message posted by: "Pat Hatch" <pat_hatch@msn.com>
>
>Bob,
>
>I am currently wiring an RV-7 in accordance with Z-14.
>
>I realize that you would normally operate with the busses un-tied thereby
>isolating two separate electrical systems. But let's say we close the
>cross-feed contactor in flight with both alternators and both batteries
>operating normally. Would it be prudent to set the voltage regulator for
>the 40-amp alternator slightly higher than the 20-amp alternator thus
>assuring that the larger alternator hogs the load? I really can't think
>of a situation when you would do this, so maybe this is just academic.
Wouldn't hurt to do this but better I think to
have a warning light that comes on when the cross-feed
contactor is closed.
Bob . . .
Message 16
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| Subject: | B&C 20 amp vac pad major failure |
--> AeroElectric-List message posted by: richard@riley.net
Normally I wouldn't dream of forwarding pictures to this list, but these
are ultra-topical. They're what remain of a 20 amp B&C backup alternator
that was mounted on the vacuum pad of a Lycoming 260 hp IO-540 on a
Berkut. More details as I get them.
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