Today's Message Index:
----------------------
1. 07:12 AM - Re: Re: Infinity stick graphics (Christopher Cee Stone)
2. 08:18 AM - Braided ground strap to battery? (Andy)
3. 08:32 AM - Re: Braided ground strap to battery? (John Tipton)
4. 08:50 AM - Re: Braided ground strap to battery? (Fisher Paul A.)
5. 09:51 AM - Re: Braided ground strap to battery? (R. curtis)
6. 10:56 AM - Re: Braided ground strap to battery? (Fisher Paul A.)
7. 11:18 AM - Re: Braided ground strap to battery? (Robert L. Nuckolls, III)
8. 02:52 PM - Re: Braided ground strap to battery? (Andy Crabtree)
9. 05:25 PM - RV6A Starter Contacter Problem (Jack Haviland)
10. 06:02 PM - Re: vhf transponder interference (jappie)
11. 06:07 PM - Re: vhf transponder interference (jappie)
12. 07:38 PM - Re: RV6A Starter Contacter Problem (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: Infinity stick graphics |
Matt...
Thanks! I love this list... question asked... problem solved!
chris stone
RV-8
On Mon, Mar 4, 2013 at 3:32 PM, Matt Dralle <dralle@matronics.com> wrote:
> >
>
> At 03:29 PM 3/4/2013 Monday, you wrote:
> mrspudandcompany@verizon.net>
> >
> >
> >>I drew that placecard myself in Corel Designer and had it printed at a
> local graphics shop. Originally I had it silk screened.
> >>
> >>Let me see what I've got. I can probably save it in a variety of
> different formats.
> >>
> >>Here's the original entry from my Log:
> >>
> >>
> http://www.mattsrv8.com/users/display_log.php?user=MattsRV8&project=638&category=2971&log008&row=38
> >
> >
> > Matt,
> >
> > I get this when I try to open: Unable to find a work log with the
> specified id or no id was specified.
> >
> > Roger
>
>
> Sorry, fat-fingered the URL. Here is the correct one:
>
>
> http://www.mattsrv8.com/users/display_log.php?user=MattsRV8&project=638&category=2971&log=166114&row=38
>
> Matt
>
>
> -
> Matt Dralle
>
> RV-8 #82880 N998RV "Ruby Vixen"
> http://www.mattsrv8.com - Matt's Complete RV-8 Construction Log
> http://www.mattsrv8.com/Mishap - Landing Mishap Rebuild Log
> http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
> Status: 172+ Hours TTSN - Rebuilding Fuselage After Landing Mishap...
>
> RV-6 #20916 N360EM "The Flyer"
> http://www.mattsrv6.com - Matt's RV-6 Revitalization Log
> Status: 140+ Hours Since Purchase - Upgrades Complete; Now In Full Flyer
> Mode
>
>
Message 2
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| Subject: | Braided ground strap to battery? |
Might be a stupid question but, I was wondering about the possibility of using
a braided ground strap from b and c to go from the battery to the grounding forest
of tabs on the firewall.
Thanks
Andy
Sent from my iPhone
Message 3
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| Subject: | Re: Braided ground strap to battery? |
So long as it cannot touch any live (plus volts) contacts - OK, I would think
John
Sent from my iPad
----x--O--x----
On 5 Mar 2013, at 16:16, Andy <crabandy@yahoo.com> wrote:
>
>
> Might be a stupid question but, I was wondering about the possibility of using
a braided ground strap from b and c to go from the battery to the grounding
forest of tabs on the firewall.
> Thanks
> Andy
> Sent from my iPhone
>
>
>
>
Message 4
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| Subject: | Braided ground strap to battery? |
That's what I did. Actually I did three straps:
- Engine to Battery ground
- Engine to forest of tabs on firewall
- Battery ground to forest of tabs on firewall
So far, no problems in 3.5 years. It's probably more than is really required,
but I already had the extra strap and I didn't figure it would hurt. Belt and
suspenders I guess...
Paul A. Fisher
RV-7A N18PF
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Andy
Sent: Tuesday, March 05, 2013 10:17 AM
Subject: AeroElectric-List: Braided ground strap to battery?
Might be a stupid question but, I was wondering about the possibility of using
a braided ground strap from b and c to go from the battery to the grounding forest
of tabs on the firewall.
Thanks
Andy
Sent from my iPhone
Message 5
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| Subject: | Re: Braided ground strap to battery? |
> That's what I did. Actually I did three straps:
> - Engine to Battery ground
> - Engine to forest of tabs on firewall
> - Battery ground to forest of tabs on firewall
With multiple ground paths to the battery,
from the above configuration, isn't there a
chance of introducing ground loops,
causing noise problems??
Roger
--
Do you have a slow PC? Try a Free scan http://www.spamfighter.com/SLOW-PCfighter?cid=sigen
Message 6
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| Subject: | Braided ground strap to battery? |
Good question. My thought was that the systems that would be susceptible to noise
(all of the audio components) are inside the cabin - nothing forward of the
firewall. So for those components there is only one path to the battery. Only
the starter and the alternator would have dual paths. Obviously the starter
is only used once per flight, so it's not a problem, so that just leaves the
alternator. I can't explain the physics of WHY it's not a problem. I can only
state that the fact that there ARE no problems! YMMV.
- Paul
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of R. curtis
Sent: Tuesday, March 05, 2013 11:49 AM
Subject: Re: AeroElectric-List: Braided ground strap to battery?
--> <mrspudandcompany@verizon.net>
> That's what I did. Actually I did three straps:
> - Engine to Battery ground
> - Engine to forest of tabs on firewall
> - Battery ground to forest of tabs on firewall
With multiple ground paths to the battery,
from the above configuration, isn't there a
chance of introducing ground loops,
causing noise problems??
Roger
--
Do you have a slow PC? Try a Free scan http://www.spamfighter.com/SLOW-PCfighter?cid=sigen
Message 7
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| Subject: | Re: Braided ground strap to battery? |
At 10:16 AM 3/5/2013, you wrote:
>
>
>Might be a stupid question but, I was wondering about the
>possibility of using a braided ground strap from b and c to go from
>the battery to the grounding forest of tabs on the firewall.
The legacy rationale for ground straps of many
finely drawn wires was common in vehicles for
grounding an engine to the vehicle frame or maintaining
electrical continuity across moveable joints in
the machine. The engine needed to move around in
its mounts but often needed grounding integrity
for starter motors and generators/alternators.
Electrical connections that are in motion with
respect to each other demand a conductor that
is exceedingly resistant to flex failure (See
explanation of design goals for 19+strand wire
on airplanes in the 'Connection).
How long a strap are we talking about? Have
you considered welding cable for BOTH battery
(-) and (+) connections? It's a good thing to
reduce the bending moments on battery terminals
due to stiff wire. Some builders have experienced
battery post failures when short lengths of 2AWG
'aircraft' wire was used to jumper a battery(+)
to the contactor.
I would recommend that you consider 4AWG welding
cable jumpers for both battery connections. Then
consider what materials make the most sense for
cost, weight, system performance, or wire that your
hangar mate donated to the project.
A braided strap from fire wall ground to crankcase
is a good thing. A welding cable jumper is equally
good. I'm aware of no particular advantage for
using a fabricated braid-strap to make connections
to the battery . . . but it wouldn't hurt anything
either.
Bob . . .
Message 8
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| Subject: | Re: Braided ground strap to battery? |
Thanks for the replies!=0AI can make the 2 AWG (what I currently have in my
shop) work but the service loop is kinda big. I was thinking about having
the ground strap made (about 6 inches) by BandC and for the same price as t
he welding cable I think the strap would fit nicer. =0A=0A=0A______________
__________________=0AFrom: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelec
tric.com>=0ATo: aeroelectric-list@matronics.com =0ASent: Tuesday, March 5,
2013 1:18 PM=0ASubject: Re: AeroElectric-List: Braided ground strap to batt
" <nuckolls.bob@aeroelectric.com>=0A=0AAt 10:16 AM 3/5/2013, you wrote:=0A>
> =0A> Might be a stupid question but, I was wondering about the possibilit
y of using a braided ground strap from b and c to go from the battery to th
e grounding forest of tabs on the firewall.=0A=0A=0A- The legacy rational
e for ground straps of many=0A- finely drawn wires was common in vehicles
for=0A- grounding an engine to the vehicle frame or maintaining=0A- el
ectrical continuity across moveable joints in=0A- the machine. The- eng
ine needed to move around in=0A- its mounts but often needed grounding in
tegrity=0A- for starter motors and generators/alternators.=0A- Electric
al connections that are in motion with=0A- respect to each other demand a
conductor that=0A- is exceedingly resistant to flex failure (See=0A- e
xplanation of design goals for 19+strand wire=0A- on airplanes in the 'Co
nnection).=0A=0A- How long a strap are we talking about? Have=0A- you c
onsidered welding cable for BOTH battery=0A- (-) and (+) connections?-
It's a good thing to=0A- reduce the bending moments on battery terminals
=0A- due to stiff wire. Some builders have experienced=0A- battery post
failures when short lengths of 2AWG=0A- 'aircraft' wire was used to jump
er a battery(+)=0A- to the contactor.=0A=0A- I would recommend that you
consider 4AWG welding=0A- cable jumpers for both battery connections. Th
en=0A- consider what materials make the most sense for=0A- cost, weight
, system performance, or wire that your=0A- hangar mate donated to the pr
oject.=0A=0A- A braided strap from fire wall ground to crankcase=0A- is
a good thing. A welding cable jumper is equally=0A- good. I'm aware of n
o particular advantage for=0A- using a fabricated braid-strap to make con
nections=0A- to the battery . . . but it wouldn't hurt anything=0A- eit
==
Message 9
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| Subject: | RV6A Starter Contacter Problem |
Anybody had a problem with Van's Aircraft starter contactor ES 24021? It's reputed
to be a Cole Hersee product designed to make and break 750 and 100 amps respectively
using a 3-4 ohm coil. The original lasted about 100 hours before failing
to provide12 volts to the "output terminal" when the starter switch triggered
the internal connection for the high current terminals. This was confirmed
by the sound of the moving "slug" and voltage measurements made at the "S"
and both "high current" terminals. Hitting it with a hammer would make sometimes
make it conduct properly but it eventually failed completely. Drilling out
the rivets to inspect the contacts showed a mild discoloration and minimal overlap
between the moving and fixed contacts but nothing else.
Now the replacement is doing the same thing after about 50 hours. An external diode
protects the starter switch contacts. There has never been a problem with
the pinion-ring gear engagement or disengagement, so the contactor is wired to
the normal stud on the starter motor solenoid and the "jumper wire" was left
in place. Any suggestions as to cause &/or solutions? Are there starter contractors
that rotate the moving contact to even out wear etc.?
Jack H.
RV-6A
O-320 D1A with the standard Sky Tek
Message 10
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| Subject: | Re: vhf transponder interference |
here is my new cable RG-142
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=395708#395708
Attachments:
http://forums.matronics.com//files/p3030042_web_157.jpg
http://forums.matronics.com//files/p3030041_web_483.jpg
http://forums.matronics.com//files/p3030040_web_200.jpg
Message 11
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| Subject: | Re: vhf transponder interference |
Here is my new RG-142 cable.
pictures are in the wrong order
JP
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=395709#395709
Attachments:
http://forums.matronics.com//files/p3030042_web_119.jpg
http://forums.matronics.com//files/p3030041_web_269.jpg
http://forums.matronics.com//files/p3030040_web_147.jpg
http://forums.matronics.com//files/p3030039_web_321.jpg
Message 12
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| Subject: | Re: RV6A Starter Contacter Problem |
At 07:23 PM 3/5/2013, you wrote:
Anybody had a problem with Van's Aircraft starter contactor ES 24021?
It's reputed to be a Cole Hersee product designed to make and break
750 and 100 amps respectively using a 3-4 ohm coil. The original
lasted about 100 hours before failing
. . . .
Now the replacement is doing the same thing after about 50 hours. An
external diode protects the starter switch contacts. There has never
been a problem with the pinion-ring gear engagement or disengagement,
so the contactor is wired to the normal stud on the starter motor
solenoid and the "jumper wire" was left in place. Any suggestions as
to cause &/or solutions? Are there starter contractors that rotate
the moving contact to even out wear etc.?
That's a really old legacy design. Haven't really
heard of your situation before. Just for grins,
it would be interesting to try this style contactor.
They're about 40 years 'younger' in design than the
beer-barrel contactors. MUCH higher contact pressures.
[]
[]
This form factor is common to several off the shelf
contactors you should be able pick up at a local
car-parts store.
Bob . . .
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