Today's Message Index:
----------------------
1. 12:39 AM - Davd Clark X-11 headset review? (Jim Jewell)
2. 05:43 AM - Re: Engine Kick-Back IO-360 (Robert L. Nuckolls, III)
3. 05:56 AM - Turn on ALT before engine start? (Bill Denton)
4. 05:58 AM - Re: Transorbs for Lancair Flap Actuator... (Bob Verwey)
5. 06:13 AM - Re: Noise filter noise (Johnson, Phillip (EXP))
6. 06:37 AM - Re: Transorbs for Lancair Flap Actuator... (Bishop, Robert C MSgt 21 MOF/CCA)
7. 07:00 AM - Re:How to unsubscribe (Dale Ensing)
8. 07:35 AM - Re: Davd Clark X-11 headset review? (Cory Emberson)
9. 08:09 AM - Re: Turn on ALT before engine start? (Brian Lloyd)
10. 08:06 PM - Mag noise filters..... (Jim Baker)
11. 08:47 PM - Re: Mag noise filters..... (Robert L. Nuckolls, III)
Message 1
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| Subject: | Davd Clark X-11 headset review? |
--> AeroElectric-List message posted by: "Jim Jewell" <jjewell@telus.net>
Hello listers,
The David Clark Co. Inc. website offers what apears to be a new headset
called X 11.
The promo on the website looks good
I have not heard or found any other reports pro or can about this product.
Would anyone care to offer opinions based on actual use?
Jim in Kelowna - final inspection soon
Message 2
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| Subject: | Re: Engine Kick-Back IO-360 |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckollsr@cox.net>
>
> > --> RV-List message posted by: "J. R. Dial" <jrdial@hal-pc.org>
> >
> > I did not break a starter but the inrush current to the
> > permanent magnet starter I had dropped my voltage low enough that it
> > was
> > below the compliance voltage for the electronic ignition. I changed
> > it
> > out for a wound field starter and the problem was solved.
> > If you want to know brand names etc. email me off list.
>--> AeroElectric-List message posted by: Larry Mac Donald <lm4@juno.com>
>
>Now here is a problem I've never heard of before.
>Does anyone else have this problem and can it be
>resolved without changing out starters ?
>Larry Mac Donald
>lm4@juno.com
>Rochester N.Y.
>Do not achcive
This "problem" and "solution" has been around for
a long time. When the volumes of rare-earth magnet
motors was taking off in the market place (and prices
coming down) we (at B&C) considered a change-over
to the burgeoning technology.
The change was rejected for several reasons but
prominent among them was the extra-ordinary "locked-
rotor" current characteristics of the PM motor.
This did not present a systems issue with respect
to getting the engine running but we were already aware
of problems that some companies had with respect to
momentary "brownouts" during the first phases of
engine cranking. A typical system voltage transient
during first closure of starter contactor may be
seen at:
http://www.aeroelectric.com/Pictures/Curves/95_GMC_Safari_1.gif
http://www.aeroelectric.com/Pictures/Curves/95_GMC_Safari_3.gif
http://www.aeroelectric.com/Pictures/Curves/99_Saturn_SL1.jpg
http://www.aeroelectric.com/Pictures/Curves/99_Saturn_SL1_2.gif
These are battery terminal voltages taken from
our cars. The batteries are in excellent health. Note in
particular, the last curve where the battery voltage
stays below 9.0 volts (DO-160 recommended, "stay awake"
voltage level) for about 50 mS. If the ignition system
(or any other accessory) shared any supply current
paths with the starter the voltage drops on wires would
exacerbate the brown out conditions illustrated.
Unfortunately, many folks who would sell to either the
TC or OBAM aviation worlds do not take the DO-160 recommendations
to heart and ignore the realities of cranking systems operation,
they allow their products loose in the wild with unhappy
vulnerabilities to such transients.
Sometimes it's an extended reboot interval for a computer based
accessory, or timing for an ignition system wherein
the system delivers spark at the wrong times.
One of several reasons B&C elected to stay with
wound fields was to reduce probability that their product
would be cited as "root cause" of problems with other
systems. Contrary to popular myth, starters are NEVER
root cause for misbehavior of another system, only
a piece of a puzzle at best . . . for issues that
would not have arisen had manufacturers of the "victimized"
systems done their homework.
Bob . . .
Message 3
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| Subject: | Turn on ALT before engine start? |
--> AeroElectric-List message posted by: "Bill Denton" <bdenton@bdenton.com>
In an airplane equipped with a Continental 0-200, would you want to turn on the
ALT switch before engine start, or after?
Thanks!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=57936#57936
Message 4
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| Subject: | Re: Transorbs for Lancair Flap Actuator... |
Greg,
Could you post that part of the circuit (or sketch) showing the "brake"
system relays where it "shorts" the motor leads. Working on something
similar for a homebuilt project with 28v. Also where you would put the
transorbs.
Thanx
Bob Verwey
A35 Bonanza ZU-DLW
Message 5
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| Subject: | Re: Noise filter noise |
The core of the inductor is probably lightly magnetostrictive which will
cause the core to vibrate under electrical excitation. This is normal,
however if the mechanical resonance of the core is close to the
excitation frequency then it will howl quite loudly and may induce
premature failure of adjacent components. If this is the case then you
can damp the vibration by adding some silicone or epoxy to the inductor.
This will move the natural frequency and damp the vibration.
Phillip Johnson
L
Chief Engineer & Manager Underwater Systems Group
Tel (613) 599 3280 ext. 3232
Cell (613) 799 1644
FAX (613) 599 3282
Message 6
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| Subject: | Transorbs for Lancair Flap Actuator... |
--> AeroElectric-List message posted by: "Bishop, Robert C MSgt 21 MOF/CCA" <robert.bishop@peterson.af.mil>
TWIMC,
How on earth can I get off this "Chat Board" distribution list? I get
about 300 unwanted e-mails a day... Any help would be appreciated.
Thanks
MSgt Robert Bishop
21 MOF/CCA
W: 556-6527 (DSN 834)
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Bob
Verwey
Sent: Monday, August 28, 2006 6:57 AM
Subject: Re: AeroElectric-List: Transorbs for Lancair Flap Actuator...
Greg,
Could you post that part of the circuit (or sketch) showing the "brake"
system relays where it "shorts" the motor leads. Working on something
similar for a homebuilt project with 28v. Also where you would put the
transorbs.
Thanx
Bob Verwey
A35 Bonanza ZU-DLW
Message 7
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| Subject: | Re:How to unsubscribe |
--> AeroElectric-List message posted by: "Dale Ensing" <densing@carolina.rr.com>
Mr. Bishop,
go to http://www.matronics.com/subscription and follow instruction to
unsubscribe.
DWE
do not archieve
----- Original Message -----
From: "Bishop, Robert C MSgt 21 MOF/CCA" <robert.bishop@peterson.af.mil>
Sent: Monday, August 28, 2006 9:36 AM
Subject: RE: AeroElectric-List: Transorbs for Lancair Flap Actuator...
> --> AeroElectric-List message posted by: "Bishop, Robert C MSgt 21
MOF/CCA" <robert.bishop@peterson.af.mil>
>
> TWIMC,
> How on earth can I get off this "Chat Board" distribution list? I get
> about 300 unwanted e-mails a day... Any help would be appreciated.
> Thanks
>
> MSgt Robert Bishop
> 21 MOF/CCA
> W: 556-6527 (DSN 834)
>
Message 8
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| Subject: | Re: Davd Clark X-11 headset review? |
--> AeroElectric-List message posted by: Cory Emberson <bootless@earthlink.net>
Jim,
I didn't get a chance to wear them in-flight for my most recent headset
review (for Kitplanes - they hadn't been released before the deadline),
but when I tried them on at the booth, they were incredibly comfortable,
rivally the Bose X, and the audio quality was very good. If they have a
try and buy deal, I'd gibe it a shot. My immediate impression was that I
wished I could have flown them for the review.
best, Coryt
Jim Jewell wrote:
> --> AeroElectric-List message posted by: "Jim Jewell" <jjewell@telus.net>
>
> Hello listers,
>
> The David Clark Co. Inc. website offers what apears to be a new
> headset called X 11.
>
> The promo on the website looks good
> I have not heard or found any other reports pro or can about this
> product.
>
> Would anyone care to offer opinions based on actual use?
>
> Jim in Kelowna - final inspection soon
>
>
Message 9
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| Subject: | Re: Turn on ALT before engine start? |
--> AeroElectric-List message posted by: Brian Lloyd <brian-av@lloyd.com>
On Aug 28, 2006, at 5:55 AM, Bill Denton wrote:
> --> AeroElectric-List message posted by: "Bill Denton"
> <bdenton@bdenton.com>
>
> In an airplane equipped with a Continental 0-200, would you want to
> turn on the ALT switch before engine start, or after?
It doesn't matter. Do what makes you feel most comfortable.
Brian Lloyd 361 Catterline Way
brian HYPHEN av AT lloyd DOT com Folsom, CA 95630
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
Antoine de Saint-Exupry
Message 10
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| Subject: | Mag noise filters..... |
X-mailer: Pegasus Mail for Windows (4.21c)
--> AeroElectric-List message posted by: "Jim Baker" <jlbaker@msbit.net>
Is anyone aware of a master list or good explanation floating around
as to the utility/need for filters as used on magnetos? I'll call TCM
tomorrow to get their take on the situation on the Bendix series.
Reason I'm asking is I'm almost done with the install of a rebuilt
IO520K1B that replaces the old original Phase 1 case (cracked
about 3/4 way round the #6 cyl in flight) in a Bellanca Viking. The old
mags had one filter on the right mag and none on the left...which
seems kind of odd but I did nothing about it since all my comm was
good. Any guidelines appreciated. Some of the data I've seen says
the need for a filter depends a great deal on the mag capacitor
design and its frequency characteristics.
Jim Baker
580.788.2779
'71 SV, 492TC
Elmore City, OK
Message 11
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| Subject: | Re: Mag noise filters..... |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckollsr@cox.net>
At 10:02 PM 8/28/2006 -0500, you wrote:
>--> AeroElectric-List message posted by: "Jim Baker" <jlbaker@msbit.net>
>
>Is anyone aware of a master list or good explanation floating around
>as to the utility/need for filters as used on magnetos? I'll call TCM
>tomorrow to get their take on the situation on the Bendix series.
>Reason I'm asking is I'm almost done with the install of a rebuilt
>IO520K1B that replaces the old original Phase 1 case (cracked
>about 3/4 way round the #6 cyl in flight) in a Bellanca Viking. The old
>mags had one filter on the right mag and none on the left...which
>seems kind of odd but I did nothing about it since all my comm was
>good. Any guidelines appreciated. Some of the data I've seen says
>the need for a filter depends a great deal on the mag capacitor
>design and its frequency characteristics.
Fly it and see if you need it. The magneto already has
a pretty high quality capacitor right across the
p-lead as it exits the case. Wire with shielded wire
as illustrated in Figures Z-26/Z-27 of
http://aeroelectric.com/articles/Rev11/AppZ_R11J.pdf
and I believe you're unlikely to need any additional
filtering.
Bob . . .
---------------------------------------------------------
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >
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