Today's Message Index:
----------------------
1. 08:02 AM - Re: Firewall Hot-Side Enclosure (Richard Dudley)
2. 08:29 AM - Re: Firewall Hot-Side Enclosure (Jared Yates)
3. 09:22 AM - Re: Firewall Hot-Side Enclosure (Richard Dudley)
4. 10:22 AM - Re: Firewall Hot-Side Enclosure (bob noffs)
5. 10:33 AM - Re: Firewall Hot-Side Enclosure (Richard Dudley)
6. 10:33 AM - Re: Firewall Hot-Side Enclosure (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: Firewall Hot-Side Enclosure |
Hi Jared,
I looked through my collection of construction photos and found three
that might be of interest. I made a cover of fiberglass to physically
protect electrically "hot" components that had large exposed areas. My
concern was more for protecting them from any possibility of conductive
contact to airframe ground more than for protection from dust or oil
vapors. The two components protected were an ammeter shunt and an ANL 60
fuse to the output from the alternator. Both of these were at battery
positive potential when the master switch was closed.
I made the cover of fiberglass. It had openings on two sides: to the
alternator, ammeter and the master contactor. I attached it to the
firewall with screws and nutplates.
There are three photos, one of the components uncovered, and two of the
fiberglass cover in place. The cover was later painted.
I hope this is of some help.
Best regards and good luck,
Richard Dudley
RV-6A (sold)
----- Original Message -----
From: Jared Yates
To: aeroelectric-list@matronics.com
Sent: Friday, August 13, 2010 5:09 PM
Subject: AeroElectric-List: Firewall Hot-Side Enclosure
I was thinking about how it might be convenient to house some of the
electrical components on the hot side of the firewall inside of an
environmentally sealed plastic box. Most land vehicles use something
similar, and if I remember correctly Cessna started doing something
similar on their post-1997 production singles. The items that I had in
mind were the contactors, current limiters, shunts, maybe a small fuse
block for the battery bus, and that sort of thing. The box would keep
out the engine compartment grime, and there are lots of different
designs available in the sporting goods industry. Has anyone done
something similar, or can anyone think of why this would be a bad idea?
Message 2
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| Subject: | Re: Firewall Hot-Side Enclosure |
Richard, thanks for taking the time to search your archives. Did you
encounter any problems with your box in service?
On Sat, Aug 14, 2010 at 11:00 AM, Richard Dudley <rhdudley1@bellsouth.net>wrote:
> Hi Jared,
>
> I looked through my collection of construction photos and found three that
> might be of interest. I made a cover of fiberglass to physically protect
> electrically "hot" components that had large exposed areas. My concern was
> more for protecting them from any possibility of conductive contact to
> airframe ground more than for protection from dust or oil vapors. The two
> components protected were an ammeter shunt and an ANL 60 fuse to the output
> from the alternator. Both of these were at battery positive potential when
> the master switch was closed.
>
> I made the cover of fiberglass. It had openings on two sides: to the
> alternator, ammeter and the master contactor. I attached it to the firewall
> with screws and nutplates.
>
> There are three photos, one of the components uncovered, and two of the
> fiberglass cover in place. The cover was later painted.
>
> I hope this is of some help.
>
> Best regards and good luck,
>
> Richard Dudley
> RV-6A (sold)
>
> ----- Original Message -----
> *From:* Jared Yates <email@jaredyates.com>
> *To:* aeroelectric-list@matronics.com
> *Sent:* Friday, August 13, 2010 5:09 PM
> *Subject:* AeroElectric-List: Firewall Hot-Side Enclosure
>
> I was thinking about how it might be convenient to house some of the
> electrical components on the hot side of the firewall inside of an
> environmentally sealed plastic box. Most land vehicles use something
> similar, and if I remember correctly Cessna started doing something similar
> on their post-1997 production singles. The items that I had in mind were
> the contactors, current limiters, shunts, maybe a small fuse block for the
> battery bus, and that sort of thing. The box would keep out the engine
> compartment grime, and there are lots of different designs available in the
> sporting goods industry. Has anyone done something similar, or can anyone
> think of why this would be a bad idea?
>
> *
>
> href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matronics.com/Navigator?AeroElectric-List
> href="http://forums.matronics.com">http://forums.matronics.com
> href="http://www.matronics.com/contribution">http://www.matronics.com/c*
>
>
Message 3
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| Subject: | Re: Firewall Hot-Side Enclosure |
Jared,
No problems over 140 hours over tree years flying mostly in Florida.
Rich
----- Original Message -----
From: Jared Yates
To: aeroelectric-list@matronics.com
Sent: Saturday, August 14, 2010 11:25 AM
Subject: Re: AeroElectric-List: Firewall Hot-Side Enclosure
Richard, thanks for taking the time to search your archives. Did you
encounter any problems with your box in service?
On Sat, Aug 14, 2010 at 11:00 AM, Richard Dudley
<rhdudley1@bellsouth.net> wrote:
Hi Jared,
I looked through my collection of construction photos and found
three that might be of interest. I made a cover of fiberglass to
physically protect electrically "hot" components that had large exposed
areas. My concern was more for protecting them from any possibility of
conductive contact to airframe ground more than for protection from dust
or oil vapors. The two components protected were an ammeter shunt and an
ANL 60 fuse to the output from the alternator. Both of these were at
battery positive potential when the master switch was closed.
I made the cover of fiberglass. It had openings on two sides: to the
alternator, ammeter and the master contactor. I attached it to the
firewall with screws and nutplates.
There are three photos, one of the components uncovered, and two of
the fiberglass cover in place. The cover was later painted.
I hope this is of some help.
Best regards and good luck,
Richard Dudley
RV-6A (sold)
----- Original Message -----
From: Jared Yates
To: aeroelectric-list@matronics.com
Sent: Friday, August 13, 2010 5:09 PM
Subject: AeroElectric-List: Firewall Hot-Side Enclosure
I was thinking about how it might be convenient to house some of
the electrical components on the hot side of the firewall inside of an
environmentally sealed plastic box. Most land vehicles use something
similar, and if I remember correctly Cessna started doing something
similar on their post-1997 production singles. The items that I had in
mind were the contactors, current limiters, shunts, maybe a small fuse
block for the battery bus, and that sort of thing. The box would keep
out the engine compartment grime, and there are lots of different
designs available in the sporting goods industry. Has anyone done
something similar, or can anyone think of why this would be a bad idea?
href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.
matronics.com/Navigator?AeroElectric-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
Message 4
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| Subject: | Re: Firewall Hot-Side Enclosure |
richard,
i noticed your conventional baffling for cooling your jab. i am a few
months away from a first flight and i did the same type of cooling. how has
this baffling worked for cooling? was there much ''tweaking'' after it was
done to get the temps down enough?
bob noffs
On Sat, Aug 14, 2010 at 10:00 AM, Richard Dudley <rhdudley1@bellsouth.net>wrote:
> Hi Jared,
>
> I looked through my collection of construction photos and found three that
> might be of interest. I made a cover of fiberglass to physically protect
> electrically "hot" components that had large exposed areas. My concern was
> more for protecting them from any possibility of conductive contact to
> airframe ground more than for protection from dust or oil vapors. The two
> components protected were an ammeter shunt and an ANL 60 fuse to the output
> from the alternator. Both of these were at battery positive potential when
> the master switch was closed.
>
> I made the cover of fiberglass. It had openings on two sides: to the
> alternator, ammeter and the master contactor. I attached it to the firewall
> with screws and nutplates.
>
> There are three photos, one of the components uncovered, and two of the
> fiberglass cover in place. The cover was later painted.
>
> I hope this is of some help.
>
> Best regards and good luck,
>
> Richard Dudley
> RV-6A (sold)
>
> ----- Original Message -----
> *From:* Jared Yates <email@jaredyates.com>
> *To:* aeroelectric-list@matronics.com
> *Sent:* Friday, August 13, 2010 5:09 PM
> *Subject:* AeroElectric-List: Firewall Hot-Side Enclosure
>
> I was thinking about how it might be convenient to house some of the
> electrical components on the hot side of the firewall inside of an
> environmentally sealed plastic box. Most land vehicles use something
> similar, and if I remember correctly Cessna started doing something similar
> on their post-1997 production singles. The items that I had in mind were
> the contactors, current limiters, shunts, maybe a small fuse block for the
> battery bus, and that sort of thing. The box would keep out the engine
> compartment grime, and there are lots of different designs available in the
> sporting goods industry. Has anyone done something similar, or can anyone
> think of why this would be a bad idea?
>
> *
>
> href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matronics.com/Navigator?AeroElectric-List
> href="http://forums.matronics.com">http://forums.matronics.com
> href="http://www.matronics.com/contribution">http://www.matronics.com/c*
>
>
Message 5
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| Subject: | Re: Firewall Hot-Side Enclosure |
Hi Bob,
I did nothing special, only following Van's parts and plans for the
baffling. I did seal around the edges of the rear baffle. The
temperatures ran normal without any tweaking. The engine is a O-320-D1A
purchased new from Van's and my oil cooler was firewall mounted on the
right side.
Regards,
Rich
RV-6A (sold)
----- Original Message -----
From: bob noffs
To: aeroelectric-list@matronics.com
Sent: Saturday, August 14, 2010 1:18 PM
Subject: Re: AeroElectric-List: Firewall Hot-Side Enclosure
richard,
i noticed your conventional baffling for cooling your jab. i am a few
months away from a first flight and i did the same type of cooling. how
has this baffling worked for cooling? was there much ''tweaking'' after
it was done to get the temps down enough?
bob noffs
On Sat, Aug 14, 2010 at 10:00 AM, Richard Dudley
<rhdudley1@bellsouth.net> wrote:
Hi Jared,
I looked through my collection of construction photos and found
three that might be of interest. I made a cover of fiberglass to
physically protect electrically "hot" components that had large exposed
areas. My concern was more for protecting them from any possibility of
conductive contact to airframe ground more than for protection from dust
or oil vapors. The two components protected were an ammeter shunt and an
ANL 60 fuse to the output from the alternator. Both of these were at
battery positive potential when the master switch was closed.
I made the cover of fiberglass. It had openings on two sides: to the
alternator, ammeter and the master contactor. I attached it to the
firewall with screws and nutplates.
There are three photos, one of the components uncovered, and two of
the fiberglass cover in place. The cover was later painted.
I hope this is of some help.
Best regards and good luck,
Richard Dudley
RV-6A (sold)
----- Original Message -----
From: Jared Yates
To: aeroelectric-list@matronics.com
Sent: Friday, August 13, 2010 5:09 PM
Subject: AeroElectric-List: Firewall Hot-Side Enclosure
I was thinking about how it might be convenient to house some of
the electrical components on the hot side of the firewall inside of an
environmentally sealed plastic box. Most land vehicles use something
similar, and if I remember correctly Cessna started doing something
similar on their post-1997 production singles. The items that I had in
mind were the contactors, current limiters, shunts, maybe a small fuse
block for the battery bus, and that sort of thing. The box would keep
out the engine compartment grime, and there are lots of different
designs available in the sporting goods industry. Has anyone done
something similar, or can anyone think of why this would be a bad idea?
href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.
matronics.com/Navigator?AeroElectric-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
Message 6
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| Subject: | Re: Firewall Hot-Side Enclosure |
At 04:09 PM 8/13/2010, you wrote:
>I was thinking about how it might be convenient to house some of the
>electrical components on the hot side of the firewall inside of an
>environmentally sealed plastic box. Most land vehicles use
>something similar, and if I remember correctly Cessna started doing
>something similar on their post-1997 production singles. The items
>that I had in mind were the contactors, current limiters, shunts,
>maybe a small fuse block for the battery bus, and that sort of
>thing. The box would keep out the engine compartment grime, and
>there are lots of different designs available in the sporting goods
>industry. Has anyone done something similar, or can anyone think of
>why this would be a bad idea?
The strongest motivation for doing such
things in production had to do with modularizing
certain tasks which were ultimately farmed out
to other firms. Lamar and Kelly were both
examples of firms offering assemblies of
many parts that were installed as a simpler,
single operation on the production line.
While elegant in terms of labor to install,
it was less than elegant in terms of weight,
cooling, being able to optimally position
contained components and hassles of working
inside a more constrained space for maintenance.
Nonetheless, it's something of a "fad" . . .
There's a big power distribution box in
the tail of a Premier that's easy to install,
easy to take out and set on the bench . . .
but in the airplane it's impossible to
troubleshoot and out of the airplane you
can't operate it for the purposes of
troubleshooting.
Production line convenience was traded for
weight and constraints on field maintenance.
What ever rings your bells . . .
Bob . . .
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