Today's Message Index:
----------------------
1. 04:25 AM - Re: Aft Battery (Searle, Alan)
2. 07:04 AM - Re: Aft Battery (luckymacy@comcast.net (lucky))
3. 07:09 AM - Re: Aft Battery (James Freeman)
4. 09:28 AM - Re: Aft Battery (Richard McBride)
5. 06:10 PM - Re: Aft Battery (Speedy11@aol.com)
6. 07:20 PM - Re: Aft Battery (dick martin)
Message 1
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--> RV8-List message posted by: "Searle, Alan" <searle@mansfield.net.au>
Michael,
I have not done any calculations on the weight penalty of the extra ground
cable. However I have considered the situation if I chose to put the
battery at the firewall. As I have a 200HP Lycoming with C/S prop, the
aircraft would be too nose heavy for solo flight and would require ballast
in the aft baggage area.
Therefore, in my case, with the battery at the rear, the extra weight is of
no consequence. (just the extra weight).
Cheers ..... Alan.
MLWynn@aol.com writes:
> --> RV8-List message posted by: MLWynn@aol.com
>
> Hey, Alan
>
> What do you suppose the weight penalty is for the cable runs? I am building
> an RV 8, was planning to use dual batteries and am trying to figure out
> where to put them. I understand that RV 8's have a tendency to be nose heavy,
> especially with a CS prop. It certainly looks like running a ground to the
> engine would be a good idea. I suppose if you put both batteries behind the
> back seat you could run one big ground and two hot lines. Just curious about
> the weight penalty involved.
>
> Regards.
>
> Michael Wynn
> RV 8 Wings (tanks)
> San Ramon, CA
>
>
>
>
>
>
>
>
>
>
>
>
>
Message 2
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--> RV8-List message posted by: luckymacy@comcast.net (lucky)
Rick,
Where did you mount your strobe pack(s) and where/how did you ground them.
I have a situation where as soon as I fire up all the electronics and the Strobes
and the first time my radio receives a transmission after startup, I go from
wonderful silence in my headsets to faint pulse noise that coincides with the
strobes firing off.
lucky
-------------- Original message --------------
From: "Richard McBride" <rickrv8@msn.com>
> --> RV8-List message posted by: "Richard McBride"
>
> I designed my electrical system in my -8 based upon Bob's =
> recommendations. I am using two Odyssey batteries mounted in the back =
> primary for the dual electronic ignition. Contrary to Bob's advice to =
> ground at the firewall, I grounded both batteries to the nearby =
> longerons. Operationally, the electrical system has worked fine and I =
> have experienced no noise in the communication radios or other avionics.
>
> Rick McBride=20
> ----- Original Message -----=20
> From: MLWynn@aol.com=20
> To: rv8-list@matronics.com=20
> Sent: Friday, May 26, 2006 7:04 PM
> Subject: Re: RV8-List: Aft Battery
>
>
> --> RV8-List message posted by: MLWynn@aol.com
>
> Hey, Alan
> =20
> What do you suppose the weight penalty is for the cable runs? I am =
> building=20
> an RV 8, was planning to use dual batteries and am trying to figure =
> out =20
> where to put them. I understand that RV 8's have a tendency to be =
> nose heavy,=20
> especially with a CS prop. It certainly looks like running a ground =
> to the=20
> engine would be a good idea. I suppose if you put both batteries =
> behind the=20
> back seat you could run one big ground and two hot lines. Just =
> curious about=20
> the weight penalty involved.
> =20
> Regards.
> =20
> Michael Wynn
> RV 8 Wings (tanks)
> San Ramon, CA
>
>
>
>
> =
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> http://www.matronics.com/Navigator?RV8-List> gator?RV8-List>
> =
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> =
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> =
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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> =20
> =20
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<html><body>
<DIV>Rick,</DIV>
<DIV>Where did you mount your strobe pack(s) and where/how did you ground them.</DIV>
<DIV> </DIV>
<DIV>I have a situation where as soon as I fire up all the electronics and the
Strobes and the first time my radio receives a transmission after startup,
I go from wonderful silence in my headsets to faint pulse noise that coincides
with the strobes firing off.</DIV>
<DIV> </DIV>
<DIV>lucky</DIV>
<DIV> </DIV>
<BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">-------------- Original message -------------- <BR>From: "Richard McBride" <rickrv8@msn.com> <BR><BR>> --> RV8-List message posted by: "Richard McBride" <RICKRV8@MSN.COM><BR>> <BR>> I designed my electrical system in my -8 based upon Bob's = <BR>> recommendations. I am using two Odyssey batteries mounted in the back = <BR>> primary for the dual electronic ignition. Contrary to Bob's advice to = <BR>> ground at the firewall, I grounded both batteries to the nearby = <BR>> longerons. Operationally, the electrical system has worked fine and I = <BR>> have experienced no noise in the communication radios or other avionics. <BR>> <BR>> Rick McBride=20 <BR>> ----- Original Message -----=20 <BR>> From: MLWynn@aol.com<mailto:MLWynn@aol.com>=20 <BR>> To: rv8-list@matronics.com<mailto:rv8-list@matronics.com>=20 <BR>> Sent: Friday, May 26, 2006 7:04
PM <BR
>> Subject: Re: RV8-List: Aft Battery <BR>> <BR>> <BR>> --> RV8-List message posted by: MLWynn@aol.com<mailto:MLWynn@aol.com> <BR>> <BR>> Hey, Alan <BR>> =20 <BR>> What do you suppose the weight penalty is for the cable runs? I am = <BR>> building=20 <BR>> an RV 8, was planning to use dual batteries and am trying to figure = <BR>> out =20 <BR>> where to put them. I understand that RV 8's have a tendency to be = <BR>> nose heavy,=20 <BR>> especially with a CS prop. It certainly looks like running a ground = <BR>> to the=20 <BR>> engine would be a good idea. I suppose if you put both batteries = <BR>> behind the=20 <BR>> back seat you could run one big ground and two hot lines. Just = <BR>> curious about=20 <BR>> the weight penalty involved. <BR>> =20 <BR>> Regards. <BR>> =20 <BR>> Michael Wynn <BR>> RV 8 Wings (tanks) <BR>> San Ramon, CA <BR>> <BR>> <BR>> <BR>> <BR>> = <BR>> =3D=
3D=3D=
gt; _-
nn@aol
.com></mailto:rv8-list@matronics.com></mailto:MLWynn@aol.com></body></html>
Message 3
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--> RV8-List message posted by: James Freeman <flyeyes@mac.com>
I thought I'd add my $.02 here...
I'm flying a 200HP angle-valved RV-8 with a CS prop, and firewall
mounted battery. Because I used a very lightweight prop (Whirlwind
151) my CG is fine, even with the forward mounted battery.
You can look on Dan Checkoway's site for his W&B database
(rvproject.com), mine is N9TN with an empty CG at about 78.5" aft of
datum. I don't have to ballast for solo flight, and in general have
a very forgiving CG range. Many 180 hp/Hartzell equipped RV-8s have
a heavier firewall forward than mine, and a more forward CG.
Also, Eric Jones sells lightweight copper-clad aluminum wire that is
ideal for these longish runs for an aft battery. I haven't used it
myself, but would if I needed an aft battery (www.Periheliondesign.com)
James Freeman
On May 27, 2006, at 6:21 AM, Searle, Alan wrote:
> --> RV8-List message posted by: "Searle, Alan"
> <searle@mansfield.net.au>
>
> Michael,
>
> I have not done any calculations on the weight penalty of the extra
> ground
> cable. However I have considered the situation if I chose to put the
> battery at the firewall. As I have a 200HP Lycoming with C/S prop, the
> aircraft would be too nose heavy for solo flight and would require
> ballast
> in the aft baggage area.
>
> Therefore, in my case, with the battery at the rear, the extra
> weight is of
> no consequence. (just the extra weight).
>
> Cheers ..... Alan.
>
>
> MLWynn@aol.com writes:
>
>> --> RV8-List message posted by: MLWynn@aol.com
>>
>> Hey, Alan
>>
>> What do you suppose the weight penalty is for the cable runs? I
>> am building
>> an RV 8, was planning to use dual batteries and am trying to
>> figure out
>> where to put them. I understand that RV 8's have a tendency to be
>> nose heavy,
>> especially with a CS prop.(snip)
>>
>>
>>
>
>
Message 4
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--> RV8-List message posted by: "Richard McBride" <rickrv8@msn.com>
Lucky,
I have the Whelen strobe power pack mounted in the tail just behind the =
rear baggage bulkhead. I did run the strobe ground wire back to my =
common grounding bus that is located near the instrument panel. I don't =
have any strobe noise. I'm familiar with the pulse noise you're =
describing. I used to get the same noise in my old RV-6.
Rick McBride
----- Original Message -----=20
From: lucky<mailto:luckymacy@comcast.net>=20
To: rv8-list@matronics.com<mailto:rv8-list@matronics.com>=20
Sent: Saturday, May 27, 2006 10:01 AM
Subject: Re: RV8-List: Aft Battery
--> RV8-List message posted by: =
luckymacy@comcast.net<mailto:luckymacy@comcast.net> (lucky)
Rick,
Where did you mount your strobe pack(s) and where/how did you ground =
them.
I have a situation where as soon as I fire up all the electronics and =
the Strobes and the first time my radio receives a transmission after =
startup, I go from wonderful silence in my headsets to faint pulse noise =
that coincides with the strobes firing off.
lucky
-------------- Original message --------------=20
From: "Richard McBride" <rickrv8@msn.com<mailto:rickrv8@msn.com>>=20
> --> RV8-List message posted by: "Richard McBride"=20
>=20
> I designed my electrical system in my -8 based upon Bob's =3D=20
> recommendations. I am using two Odyssey batteries mounted in the =
back =3D=20
> primary for the dual electronic ignition. Contrary to Bob's advice =
to =3D=20
> ground at the firewall, I grounded both batteries to the nearby =3D=20
> longerons. Operationally, the electrical system has worked fine and =
I =3D=20
> have experienced no noise in the communication radios or other =
avionics.=20
>=20
> Rick McBride=3D20=20
> ----- Original Message -----=3D20=20
> From: MLWynn@aol.com=3D20<mailto:MLWynn@aol.com=3D20>=20
> To: rv8-list@matronics.com=3D20<mailto:rv8-list@matronics.com=3D20>=20
> Sent: Friday, May 26, 2006 7:04 PM=20
> Subject: Re: RV8-List: Aft Battery=20
>=20
>=20
> --> RV8-List message posted by: =
MLWynn@aol.com<mailto:MLWynn@aol.com>=20
>=20
> Hey, Alan=20
> =3D20=20
> What do you suppose the weight penalty is for the cable runs? I am =
=3D=20
> building=3D20=20
> an RV 8, was planning to use dual batteries and am trying to figure =
=3D=20
> out =3D20=20
> where to put them. I understand that RV 8's have a tendency to be =
=3D=20
> nose heavy,=3D20=20
> especially with a CS prop. It certainly looks like running a ground =
=3D=20
> to the=3D20=20
> engine would be a good idea. I suppose if you put both batteries =3D =
> behind the=3D20=20
> back seat you could run one big ground and two hot lines. Just =3D=20
> curious about=3D20=20
> the weight penalty involved.=20
> =3D20=20
> Regards.=20
> =3D20=20
> Michael Wynn=20
> RV 8 Wings (tanks)=20
> San Ramon, CA=20
>=20
>=20
>=20
>=20
> =3D=20
> =
=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D=
3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D=20
> =3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=20
> =
http://www.matronics.com/Navigator?RV8-List<http://www.matronics.com/Navi=
gator?RV8-List>> gator?RV8-List>=20
> =3D=20
> =
=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D=
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> =3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=20
> =3D=20
> =
=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D=
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> =3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=20
> =3D=20
> =
=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D=
3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D=20
> =3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=20
>=20
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<html><body>
<DIV>Rick,</DIV>
<DIV>Where did you mount your strobe pack(s) and where/how did you =
ground them.</DIV>
<DIV> </DIV>
<DIV>I have a situation where as soon as I fire up all the electronics =
and the Strobes and the first time my radio receives a transmission =
after startup, I go from wonderful silence in my headsets to faint =
pulse noise that coincides with the strobes firing off.</DIV>
<DIV> </DIV>
<DIV>lucky</DIV>
<DIV> </DIV>
<BLOCKQUOTE style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: =
#1010ff 2px solid">-------------- Original message -------------- =
<BR>From: "Richard McBride" <rickrv8@msn.com> <BR><BR>> --> =
RV8-List message posted by: "Richard McBride" =
<RICKRV8@MSN.COM><BR>><mailto:RICKRV8@MSN.COM><BR>>>; <BR>> I =
designed my electrical system in my -8 based upon Bob's =3D <BR>> =
recommendations. I am using two Odyssey batteries mounted in the back =
=3D <BR>> primary for the dual electronic ignition. Contrary to Bob's =
advice to =3D <BR>> ground at the firewall, I grounded both batteries =
to the nearby =3D <BR>> longerons. Operationally, the electrical =
system has worked fine and I =3D <BR>> have experienced no noise in =
the communication radios or other avionics. <BR>> <BR>> Rick =
McBride=3D20 <BR>> ----- Original Message -----=3D20 <BR>> From: =
MLWynn@aol.com<mailto:MLWynn@aol.com>=3D20<mailto:MLWynn@aol.com<mailto:M=
LWynn@aol.com>=3D20> <BR>> To: =
rv8-list@matronics.com<mailto:rv8-list@matronics.com>=3D20<mailto:rv8-lis=
t@matronics.com<mailto:rv8-list@matronics.com>=3D20> <BR>> Sent: =
Friday, May 26, 2006 7:04=20
PM <BR
>> Subject: Re: RV8-List: Aft Battery <BR>> <BR>> <BR>> =
--> RV8-List message posted by: =
MLWynn@aol.com<mailto:MLWynn@aol.com<mailto:MLWynn@aol.com<mailto:MLWynn@=
aol.com>> <BR>> <BR>> Hey, Alan <BR>> =3D20 <BR>> What do =
you suppose the weight penalty is for the cable runs? I am =3D <BR>> =
building=3D20 <BR>> an RV 8, was planning to use dual batteries and =
am trying to figure =3D <BR>> out =3D20 <BR>> where to put them. I =
understand that RV 8's have a tendency to be =3D <BR>> nose =
heavy,=3D20 <BR>> especially with a CS prop. It certainly looks like =
running a ground =3D <BR>> to the=3D20 <BR>> engine would be a =
good idea. I suppose if you put both batteries =3D <BR>> behind =
the=3D20 <BR>> back seat you could run one big ground and two hot =
lines. Just =3D <BR>> curious about=3D20 <BR>> the weight penalty =
involved. <BR>> =3D20 <BR>> Regards. <BR>> =3D20 <BR>> =
Michael Wynn <BR>> RV 8 Wings (tanks) <BR>> San Ramon, CA <BR>> =
<BR>> <BR>> <BR>> <BR>> =3D <BR>> =3D3D=3D
3D=3D3D=3D
gt; _-
nn@aol<mailto:nn@aol>
=
com></mailto:rv8-list@matronics.com></mailto:MLWynn@aol.com></body></htm=
l>
=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
http://www.matronics.com/Navigator?RV8-List<http://www.matronics.com/Navi=
gator?RV8-List>
=
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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
http://www.matronics.com/contribution<http://www.matronics.com/contributi=
on>
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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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Message 5
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--> RV8-List message posted by: Speedy11@aol.com
Dan,
Here's another idea for you. There is a longeron that extends the length of
the fuselage. It passes slightly above where your battery will be in the
back. Ground your battery to that longeron and take a ground cable from that same
longeron near the firewall and connect it to your grounding block. Not much
better grounding cable than solid metal front to back and it saves a
bucketload of weight (opps, that's one of those undefined terms that Bob frowns
on).
If you're worried about drilling too many holes in the longerons, you could
drill out one or more rivets at the front gusset and rerivet the grounding cable
to the longeron at the gusset (you'd have to devise an attachment to the cable
to would be large enough to rivet).
Stan Sutterfield
www.rv-8a.net
I am going to mount the battery in my RV8 aft of the baggage area. Vans
wiring kit suggests airframe grounding. Bob Knuckles Z Diagrams recommend a
separate (but heavy) ground cable from the battery to the engine mount.
I am considering a separate ground run. I am also considering a
separate ground for accessories (strobes, Nav, landing lights, pitot,
etc.)
Is this worth the extra weight? What are other builders doing?
I was burned by the lack of a ground run in my StormScope installation
in another airplane, but don't intend to have one in this airplane. So
am I being overly cautious at the expense of precious payload?
Message 6
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--> RV8-List message posted by: "dick martin" <martin@gbonline.com>
Dan,
I experienced a very difficultproblem when I built my RV8 6 years ago. I
installed the battery aft of the elevator bellcrank which satisfied the
balance problem caused by the IO390 engine. I unwittingly attached the
ground cable to the airframe near the battery in the aft section of the
fuselage. By doing this I created what is known as a "ground loop" in
electronics jargon. It caused me no end of "electronic" problems primarily
with the autopilot and avionics problems. After doing everything possible
to cure the problem, I was advised that I probably had a ground loop that
was causing my avionics problems. I promptly rewired my electrical system
by changing the ground cable from the battery to the fuselage to a cable
ran parallel with the power cable to the firewall and on to the engine .
This eliminated the ground loop and also elimated all of the electronic
problems that I was experiencing. I hope that this helps all of you.
Dick Martin
RV8 N233M
the fast one
----- Original Message -----
From: "Dan Beadle" <Dan.Beadle@hq.inclinesoftworks.com>
Sent: Friday, May 26, 2006 9:27 AM
Subject: RV8-List: Aft Battery
> --> RV8-List message posted by: "Dan Beadle"
> <Dan.Beadle@hq.InclineSoftworks.com>
>
> I am going to mount the battery in my RV8 aft of the baggage area. Vans
> wiring kit suggests airframe grounding. Bob Knuckles Z Diagrams
> recommend a separate (but heavy) ground cable from the battery to the
> engine mount. =20
>
> =20
>
> I am considering a separate ground run. I am also considering a
> separate ground for accessories (strobes, Nav, landing lights, pitot,
> etc.)=20
>
> =20
>
> Is this worth the extra weight? What are other builders doing?=20
>
> =20
>
> I was burned by the lack of a ground run in my StormScope installation
> in another airplane, but don't intend to have one in this airplane. So
> am I being overly cautious at the expense of precious payload?
>
>
>
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