Today's Message Index:
----------------------
1. 06:38 AM - Re: Re: Review request for RV-9 Electrical System (G3X, GTN, etc) (William Greenley)
2. 08:56 AM - Re: Re: Review request for RV-9 Electrical System (G3X, GTN, etc) (Robert L. Nuckolls, III)
3. 09:26 AM - Re: Re: Review request for RV-9 Electrical System (G3X, GTN, etc) (Carlos Trigo)
4. 09:26 AM - Re: Re: Review request for RV-9 Electrical System (G3X, GTN, etc) (William Greenley)
5. 10:42 AM - Re: Re: Review request for RV-9 Electrical System (G3X, GTN, etc) (Robert L. Nuckolls, III)
6. 10:47 AM - Re: Re: Review request for RV-9 Electrical System (G3X, GTN, etc) (Robert L. Nuckolls, III)
7. 11:11 AM - Re: Re: Review request for RV-9 Electrical System (G3X, GTN, etc) (Justin Jones)
8. 11:33 AM - Re: Re: Review request for RV-9 Electrical System (G3X, GTN, etc) (William Greenley)
9. 11:34 AM - Re: Re: Review request for RV-9 Electrical System (G3X, GTN, etc) (William Greenley)
10. 11:42 AM - Re: Re: Review request for RV-9 Electrical System (G3X, ... (ARGOLDMAN@aol.com)
11. 01:18 PM - Re: Re: Review request for RV-9 Electrical System (G3X, GTN, etc) (Robert L. Nuckolls, III)
12. 01:31 PM - Re: Re: Review request for RV-9 Electrical System (G3X, ... (Robert L. Nuckolls, III)
13. 01:45 PM - Re: Re: Review request for RV-9 Electrical System (G3X, GTN, etc) (William Greenley)
14. 03:48 PM - Re: Re: Review request for RV-9 Electrical System (G3X... (ARGOLDMAN@aol.com)
15. 06:58 PM - Re: Re: Review request for RV-9 Electrical System (G3X, GTN, etc) (Robert L. Nuckolls, III)
16. 07:27 PM - Re: Re: Review request for RV-9 Electrical System (G3X... (Robert L. Nuckolls, III)
Message 1
INDEX | Back to Main INDEX |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Review request for RV-9 Electrical System |
(G3X, GTN, etc)
One place on my Cessna I have found a breaker VERY useful is the 12v power
port (aka Cigarette lighter). Sometimes items with too big a draw get
plugged in and blow the breaker, remove item, reset, and can still use other
items in flight.
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: Wednesday, June 15, 2016 4:11 PM
Subject: Re: AeroElectric-List: Re: Review request for RV-9 Electrical
System (G3X, GTN, etc)
At 02:14 PM 6/14/2016, you wrote:
OK, I think I see your point on not needing breakers and going with fuses
but I'm not 100% there yet. For my personal sense of comfort I'd like to
have items on the endurance bus on breakers. Does this seem like a
reasonable compromise?
Compromise for what? If a breaker ever opens it means
something is broke . . . and that something threatens
to set a wire on fire. You want to give it a second
chance?
What items in your airplane are high priority equipment
for comfortable termination of flight? From that list
of items, how many of them can fail in ways that do not
open a breaker? I can tell you that the vast majority
of equipment failures never open a breaker . . . if that
item is so necessary/useful that you're worried about
being able to reclose a breaker, then you'd better have
a plan-b . . . a back up for when the system decides
to take a vacation.
It allows me to load-shed even further by pulling breakers if needed and
uses much fewer breakers and panel space. Thoughts?
Load shed? What's the e-bus for? The LAST thing
you should be doing in flight is running any kind
of mental gymnastics calculated to reduce risks
of dealing with some kind of failure. ALL such
things are done at THIS phase of your design
and fabrication. Should a necessary item go T.U.
then you go to plan-b. If the item is not necessary,
then there is no plan-B.
The idea behind the e-bus is to do a two-switch
load shed that either (1) does not overtax an
SD-8 or (2) produces a KNOWN endurance value
running battery only based on periodic capacity
checks of your battery.
Messing with any breaker or fuse in flight is a
demonstration of poor planning that should have
been managed during THIS phase of your project's
development. Put the fuse blocks out of sight and
out of mind. Deal with system difficulties as a
pilot with a plan . . . not an in-flight diagnostician
and maintenance technician.
Bob . . .
Message 2
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Review request for RV-9 Electrical System |
(G3X, GTN, etc)
At 08:36 AM 6/16/2016, you wrote:
>One place on my Cessna I have found a breaker VERY useful is the 12v
>power port (aka Cigarette lighter). Sometimes items with too big a
>draw get plugged in and blow the breaker, remove item, reset, and
>can still use other items in flight.
The factory stock 'cigar' lighter? Waaayyyy back when,
the folks at the factory decided it was better to call
them cigar lighters . . . seems that tobacco smoke
particulates were too fine to be captured by the
paper air filter for the vacuum driven instruments.
We were seeing early demise of gyros flown by
pilots who smoked while airborne . . .
Somebody got the idea that this problem might be
helped if we started calling them cigar lighters . . .
fatter smoke particles . . .
Emacs!
In any case, your anecdote is the corollary to
outlets in your house where a branch circuit
is shared by other outlets with wildly variable
total loads. Too many hot-dog cookers, microwaves,
and pizza ovens plugged in at the same time
may pop a breaker.
Fuses and breakers intended to supply system
hardware should not be shared with any other
system . . . unless loss of ALL systems is
a low, acceptable risk condition. The founding
philosophy for bus structures with independently
protected feeders is ISOLATION between systems
such that no fault brings down more than the
affected system.
How much stuff do you plug into the cigar
lighter? On many Cessnas of the 1970 time frame
the cigar lighter was powered through a 20A fuse
and later a 10A breaker. 10A is a LOT of 'stuff'
to run from such a connector
Emacs!
Bob . . .
Message 3
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Review request for RV-9 Electrical System |
(G3X, GTN, etc)
Bob
With due respect, what William meant to say is that, against the anti-CB ten
dency of you and many people in this forum, he has found a particular circui
t (the "cigar" lighter-type power port) where a circuit breaker is the prefe
rred method (instead of a fuse)
Regards
Carlos
Enviado do meu iPhone
No dia 16/06/2016, =C3-s 16:53, Robert L. Nuckolls, III <nuckolls.bob@aero
electric.com> escreveu:
> At 08:36 AM 6/16/2016, you wrote:
>> One place on my Cessna I have found a breaker VERY useful is the 12v powe
r port (aka Cigarette lighter). Sometimes items with too big a draw get plug
ged in and blow the breaker, remove item, reset, and can still use other ite
ms in flight.
>
> The factory stock 'cigar' lighter? Waaayyyy back when,
> the folks at the factory decided it was better to call
> them cigar lighters . . . seems that tobacco smoke
> particulates were too fine to be captured by the
> paper air filter for the vacuum driven instruments.
> We were seeing early demise of gyros flown by
> pilots who smoked while airborne . . .
>
> Somebody got the idea that this problem might be
> helped if we started calling them cigar lighters . . .
> fatter smoke particles . . .
>
>
> <6bca009.jpg>
>
>
> In any case, your anecdote is the corollary to
> outlets in your house where a branch circuit
> is shared by other outlets with wildly variable
> total loads. Too many hot-dog cookers, microwaves,
> and pizza ovens plugged in at the same time
> may pop a breaker.
>
> Fuses and breakers intended to supply system
> hardware should not be shared with any other
> system . . . unless loss of ALL systems is
> a low, acceptable risk condition. The founding
> philosophy for bus structures with independently
> protected feeders is ISOLATION between systems
> such that no fault brings down more than the
> affected system.
>
> How much stuff do you plug into the cigar
> lighter? On many Cessnas of the 1970 time frame
> the cigar lighter was powered through a 20A fuse
> and later a 10A breaker. 10A is a LOT of 'stuff'
> to run from such a connector
>
> <6bca066.jpg>
>
>
>
> Bob . . .
Message 4
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Review request for RV-9 Electrical System |
(G3X, GTN, etc)
Thanks for the info, I need to check the wiring et al on mine, it only has a
5A breaker. Which is easy to blow. Just assumed it was correct.
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: Thursday, June 16, 2016 11:54 AM
Subject: RE: AeroElectric-List: Re: Review request for RV-9 Electrical
System (G3X, GTN, etc)
At 08:36 AM 6/16/2016, you wrote:
One place on my Cessna I have found a breaker VERY useful is the 12v power
port (aka Cigarette lighter). Sometimes items with too big a draw get
plugged in and blow the breaker, remove item, reset, and can still use other
items in flight.
The factory stock 'cigar' lighter? Waaayyyy back when,
the folks at the factory decided it was better to call
them cigar lighters . . . seems that tobacco smoke
particulates were too fine to be captured by the
paper air filter for the vacuum driven instruments.
We were seeing early demise of gyros flown by
pilots who smoked while airborne . . .
Somebody got the idea that this problem might be
helped if we started calling them cigar lighters . . .
fatter smoke particles . . .
Emacs!
In any case, your anecdote is the corollary to
outlets in your house where a branch circuit
is shared by other outlets with wildly variable
total loads. Too many hot-dog cookers, microwaves,
and pizza ovens plugged in at the same time
may pop a breaker.
Fuses and breakers intended to supply system
hardware should not be shared with any other
system . . . unless loss of ALL systems is
a low, acceptable risk condition. The founding
philosophy for bus structures with independently
protected feeders is ISOLATION between systems
such that no fault brings down more than the
affected system.
How much stuff do you plug into the cigar
lighter? On many Cessnas of the 1970 time frame
the cigar lighter was powered through a 20A fuse
and later a 10A breaker. 10A is a LOT of 'stuff'
to run from such a connector
Emacs!
Bob . . .
Message 5
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Review request for RV-9 Electrical System |
(G3X, GTN, etc)
At 11:25 AM 6/16/2016, you wrote:
>Bob
>
>With due respect, what William meant to say is that, against the
>anti-CB tendency of you and many people in this forum, he has found
>a particular circuit (the "cigar" lighter-type power port) where a
>circuit breaker is the preferred method (instead of a fuse)
No argument . . . Cessna went away
from a 20A inline fuse to a 10A breaker
no doubt 'cause folks were popping the
fuse a lot.
The point being offered is that a well
considered array of loads to one's airplane
will never nuisance pop a breaker or fuse.
Knowing loads and limitations before
'hooking up' is a good thing to do . . .
Bob . . .
Message 6
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Review request for RV-9 Electrical System |
(G3X, GTN, etc)
At 11:25 AM 6/16/2016, you wrote:
>Thanks for the info, I need to check the wiring et al on mine, it
>only has a 5A breaker. Which is easy to blow. Just assumed it was correct.
Interesting! This is a 14 or 28v airplane? Check
your maintenance manual for the factory installed
part data . . . the drawing I posted was for
a group of 172's.
Given that all the single engine products were wired
by one electrical group, features in one model tended
to ripple across the spectrum of products . . . but
that's not a hard/fast rule. If you don't have a manual,
give me the s/n of the airplane and I'll see if my
'contacts' can shoot us the drawing.
Bob . . .
Message 7
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Review request for RV-9 Electrical System |
(G3X, GTN, etc)
Keep in mind that the circuit breaker needs to be matched to the appropriate
wire size. The circuit protection is there to protect the wire, not the loa
d.
First assess how much current the load will pull. Then choose an appropriat
e sized wire and circuit protection.
Justin
> On Jun 16, 2016, at 08:25, William Greenley <wgreenley@gmail.com> wrote:
>
> Thanks for the info, I need to check the wiring et al on mine, it only has
a 5A breaker. Which is easy to blow. Just assumed it was correct.
>
> From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelect
ric-list-server@matronics.com] On Behalf Of Robert L. Nuckolls, III
> Sent: Thursday, June 16, 2016 11:54 AM
> To: aeroelectric-list@matronics.com
> Subject: RE: AeroElectric-List: Re: Review request for RV-9 Electrical Sys
tem (G3X, GTN, etc)
>
> At 08:36 AM 6/16/2016, you wrote:
>
> One place on my Cessna I have found a breaker VERY useful is the 12v power
port (aka Cigarette lighter). Sometimes items with too big a draw get plugg
ed in and blow the breaker, remove item, reset, and can still use other item
s in flight.
>
> The factory stock 'cigar' lighter? Waaayyyy back when,
> the folks at the factory decided it was better to call
> them cigar lighters . . . seems that tobacco smoke
> particulates were too fine to be captured by the
> paper air filter for the vacuum driven instruments.
> We were seeing early demise of gyros flown by
> pilots who smoked while airborne . . .
>
> Somebody got the idea that this problem might be
> helped if we started calling them cigar lighters . . .
> fatter smoke particles . . .
>
>
> <image001.jpg>
>
>
> In any case, your anecdote is the corollary to
> outlets in your house where a branch circuit
> is shared by other outlets with wildly variable
> total loads. Too many hot-dog cookers, microwaves,
> and pizza ovens plugged in at the same time
> may pop a breaker.
>
> Fuses and breakers intended to supply system
> hardware should not be shared with any other
> system . . . unless loss of ALL systems is
> a low, acceptable risk condition. The founding
> philosophy for bus structures with independently
> protected feeders is ISOLATION between systems
> such that no fault brings down more than the
> affected system.
>
> How much stuff do you plug into the cigar
> lighter? On many Cessnas of the 1970 time frame
> the cigar lighter was powered through a 20A fuse
> and later a 10A breaker. 10A is a LOT of 'stuff'
> to run from such a connector
>
> <image002.jpg>
>
>
>
>
> Bob . . .
Message 8
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Review request for RV-9 Electrical System |
(G3X, GTN, etc)
The plane is a 1956/57 14V 172, its serial # is 29628 which is supposed to
by 1957, but it has some 1956 features like fuel vent on top of the wing. In
the years since 1957 someone had replaced the 'cigar' lighter fuse with a 5A
circuit breaker, which with a 14v plane is not very many watts. I have the
original parts catalogs, but cannot find fuse information in it, and back
then the regular manuals were very limited in detail.
Bill
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: Thursday, June 16, 2016 1:46 PM
Subject: RE: AeroElectric-List: Re: Review request for RV-9 Electrical
System (G3X, GTN, etc)
At 11:25 AM 6/16/2016, you wrote:
Thanks for the info, I need to check the wiring et al on mine, it only has a
5A breaker. Which is easy to blow. Just assumed it was correct.
Interesting! This is a 14 or 28v airplane? Check
your maintenance manual for the factory installed
part data . . . the drawing I posted was for
a group of 172's.
Given that all the single engine products were wired
by one electrical group, features in one model tended
to ripple across the spectrum of products . . . but
that's not a hard/fast rule. If you don't have a manual,
give me the s/n of the airplane and I'll see if my
'contacts' can shoot us the drawing.
Bob . . .
Message 9
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Review request for RV-9 Electrical System |
(G3X, GTN, etc)
That is my plan, trace all wiring and analyze connections.
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
Justin Jones
Sent: Thursday, June 16, 2016 2:10 PM
Subject: Re: AeroElectric-List: Re: Review request for RV-9 Electrical
System (G3X, GTN, etc)
Keep in mind that the circuit breaker needs to be matched to the
appropriate wire size. The circuit protection is there to protect the
wire, not the load.
First assess how much current the load will pull. Then choose an
appropriate sized wire and circuit protection.
Justin
On Jun 16, 2016, at 08:25, William Greenley <wgreenley@gmail.com> wrote:
Thanks for the info, I need to check the wiring et al on mine, it only
has a 5A breaker. Which is easy to blow. Just assumed it was correct.
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
Robert L. Nuckolls, III
Sent: Thursday, June 16, 2016 11:54 AM
Subject: RE: AeroElectric-List: Re: Review request for RV-9 Electrical
System (G3X, GTN, etc)
At 08:36 AM 6/16/2016, you wrote:
One place on my Cessna I have found a breaker VERY useful is the 12v
power port (aka Cigarette lighter). Sometimes items with too big a draw
get plugged in and blow the breaker, remove item, reset, and can still
use other items in flight.
The factory stock 'cigar' lighter? Waaayyyy back when,
the folks at the factory decided it was better to call
them cigar lighters . . . seems that tobacco smoke
particulates were too fine to be captured by the
paper air filter for the vacuum driven instruments.
We were seeing early demise of gyros flown by
pilots who smoked while airborne . . .
Somebody got the idea that this problem might be
helped if we started calling them cigar lighters . . .
fatter smoke particles . . .
<image001.jpg>
In any case, your anecdote is the corollary to
outlets in your house where a branch circuit
is shared by other outlets with wildly variable
total loads. Too many hot-dog cookers, microwaves,
and pizza ovens plugged in at the same time
may pop a breaker.
Fuses and breakers intended to supply system
hardware should not be shared with any other
system . . . unless loss of ALL systems is
a low, acceptable risk condition. The founding
philosophy for bus structures with independently
protected feeders is ISOLATION between systems
such that no fault brings down more than the
affected system.
How much stuff do you plug into the cigar
lighter? On many Cessnas of the 1970 time frame
the cigar lighter was powered through a 20A fuse
and later a 10A breaker. 10A is a LOT of 'stuff'
to run from such a connector
<image002.jpg>
Bob . . .
Message 10
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Review request for RV-9 Electrical System |
(G3X, ...
Or you can use a polyfuse. This will remain open until the fault is cured.
Of course when there is a fault, it behooves one to register it so that the
problem can be corrected.
With the temporary overload, when the offending device is removed, in a
very short while, the circuit is once again whole. These are used extensively
on car windows since when they reach their physical limit the amperage draw
goes up and the circuit breaks (when the window stops at its travel end,
it is usually a signal to get your hand off of the switch. If you don't,
instead of the wiring burning up, the poly fuse opens. Release the switch the
polyfuse will again reconnect and if desired you can put the window up or
down as you wish.
The polyfuse is available in various amperages and cost less than $1
usually.
The polyfuse is a thermally actuated device usually buried where the sun
don't shine with no indication of circuit breakage (although you can devise a
circuit that tells you). AlthoughI know many EABers who use them
exclusively, I still use breakers for critical circuits (although probably
overkill). I believe polyfuse is a trademark owned by littlefuse or some such
company.
Rich
In a message dated 6/16/2016 11:28:06 A.M. Pacific Daylight Time,
wgreenley@gmail.com writes:
One place on my Cessna I have found a breaker VERY useful is the 12v power
port (aka Cigarette lighter). Sometimes items with too big a draw get
plugged in and blow the breaker, remove item, reset, and can still use other
items in flight.
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L. Nuckolls, III
Sent: Wednesday, June 15, 2016 4:11 PM
Subject: Re: AeroElectric-List: Re: Review request for RV-9 Electrical
System (G3X, GTN, etc)
At 02:14 PM 6/14/2016, you wrote:
(mailto:fly@bappos.com) >
OK, I think I see your point on not needing breakers and going with fuses
but I'm not 100% there yet. For my personal sense of comfort I'd like to
have items on the endurance bus on breakers. Does this seem like a reasonable
compromise?
Compromise for what? If a breaker ever opens it means
something is broke . . . and that something threatens
to set a wire on fire. You want to give it a second
chance?
What items in your airplane are high priority equipment
for comfortable termination of flight? From that list
of items, how many of them can fail in ways that do not
open a breaker? I can tell you that the vast majority
of equipment failures never open a breaker . . . if that
item is so necessary/useful that you're worried about
being able to reclose a breaker, then you'd better have
a plan-b . . . a back up for when the system decides
to take a vacation.
It allows me to load-shed even further by pulling breakers if needed and
uses much fewer breakers and panel space. Thoughts?
Load shed? What's the e-bus for? The LAST thing
you should be doing in flight is running any kind
of mental gymnastics calculated to reduce risks
of dealing with some kind of failure. ALL such
things are done at THIS phase of your design
and fabrication. Should a necessary item go T.U.
then you go to plan-b. If the item is not necessary,
then there is no plan-B.
The idea behind the e-bus is to do a two-switch
load shed that either (1) does not overtax an
SD-8 or (2) produces a KNOWN endurance value
running battery only based on periodic capacity
checks of your battery.
Messing with any breaker or fuse in flight is a
demonstration of poor planning that should have
been managed during THIS phase of your project's
development. Put the fuse blocks out of sight and
out of mind. Deal with system difficulties as a
pilot with a plan . . . not an in-flight diagnostician
and maintenance technician.
Bob . . .
Message 11
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Review request for RV-9 Electrical |
System (G3X, GTN, etc)
At 01:32 PM 6/16/2016, you wrote:
>The plane is a 1956/57 14V 172, its serial # is 29628 which is
>supposed to by 1957, but it has some 1956 features like fuel vent on
>top of the wing. In the years since 1957 someone had replaced the
>'cigar' lighter fuse with a 5A circuit breaker, which with a 14v
>plane is not very many watts. I have the original parts catalogs,
>but cannot find fuse information in it, and back then the regular
>manuals were very limited in detail.
Yeah . . . my tour of duty didn't begin
for another 8 years. Lots of changes took
place on documentation.
Did this airplane originally have all fuses
on the bus . . . with holders that look like
this?
Emacs!
They were already using breakers by the time
I got there but I don't recall when the change
took place. Your breaker protected cigar lighter
may well be an after-market mod . . . in which
case you're not on really thin ice to simply
replace the breaker with a 10A device and insure
that connecting wires are 18AWG or larger.
Bob . . .
Message 12
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Review request for RV-9 Electrical System |
(G3X, ...
At 01:41 PM 6/16/2016, you wrote:
>Or you can use a polyfuse. This will remain open until the fault is cured.
>
>Of course when there is a fault, it behooves one to register it so
>that the problem can be corrected.
Problem with Polyfuses is how do you mount
them in an airplane? They have to be free
to get hot . . . that's what triggers their
current reduction behavior. They're designed
to solder onto an etched circuit board.
http://tinyurl.com/zevs7xy
Mounting them in a mechanically robust configuration
while letting the body of the device hang out
in the breeze is problematic.
I was tasked twice to look at Polyfuses at
Beech over the years . . . they just didn't
lend themselves to airframe integration. Inside
some black box was okay . . . but we just couldn't
figure a way to use them economically on the
bus structures.
Bob . . .
Message 13
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Review request for RV-9 Electrical System |
(G3X, GTN, etc)
That is exactly what the fuse holders look like, and yes the cb looks lik a
later mod.
On Jun 16, 2016 4:26 PM, "Robert L. Nuckolls, III" <
nuckolls.bob@aeroelectric.com> wrote:
> At 01:32 PM 6/16/2016, you wrote:
>
> The plane is a 1956/57 14V 172, its serial # is 29628 which is supposed t
o
> by 1957, but it has some 1956 features like fuel vent on top of the wing.
> In the years since 1957 someone had replaced the =98cigar=99
lighter fuse with
> a 5A circuit breaker, which with a 14v plane is not very many watts. I ha
ve
> the original parts catalogs, but cannot find fuse information in it, and
> back then the regular manuals were very limited in detail.
>
>
> Yeah . . . my tour of duty didn't begin
> for another 8 years. Lots of changes took
> place on documentation.
>
> Did this airplane originally have all fuses
> on the bus . . . with holders that look like
> this?
>
>
> [image: Emacs!]
>
> They were already using breakers by the time
> I got there but I don't recall when the change
> took place. Your breaker protected cigar lighter
> may well be an after-market mod . . . in which
> case you're not on really thin ice to simply
> replace the breaker with a 10A device and insure
> that connecting wires are 18AWG or larger.
>
>
> Bob . . .
>
Message 14
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Review request for RV-9 Electrical System |
(G3X...
yep make a small PC board with leads coming out. Heat shrink for protection
(just small enough to protect and not crush
Rich
In a message dated 6/16/2016 1:32:16 P.M. Pacific Daylight Time,
nuckolls.bob@aeroelectric.com writes:
At 01:41 PM 6/16/2016, you wrote:
Or you can use a polyfuse. This will remain open until the fault is cured.
Of course when there is a fault, it behooves one to register it so that
the problem can be corrected.
Problem with Polyfuses is how do you mount
them in an airplane? They have to be free
to get hot . . . that's what triggers their
current reduction behavior. They're designed
to solder onto an etched circuit board.
_http://tinyurl.com/zevs7xy
_ (http://tinyurl.com/zevs7xy) Mounting them in a mechanically robust
configuration
while letting the body of the device hang out
in the breeze is problematic.
I was tasked twice to look at Polyfuses at
Beech over the years . . . they just didn't
lend themselves to airframe integration. Inside
some black box was okay . . . but we just couldn't
figure a way to use them economically on the
bus structures.
Bob . . .
Message 15
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Review request for RV-9 Electrical System |
(G3X, GTN, etc)
At 03:41 PM 6/16/2016, you wrote:
>That is exactly what the fuse holders look like, and yes the cb
>looks lik a later mod.
shucks, you're home free. upsize the breaker and wire
as appropriate. we'll never tell.
Bob . . .
Message 16
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Review request for RV-9 Electrical System |
(G3X...
At 05:46 PM 6/16/2016, you wrote:
>yep make a small PC board with leads coming out. Heat shrink for
>protection (just small enough to protect and not crush
But if you 'touch' the sides of the Polyfuse
in any way, it takes heat out causing dissipation
requirements for transition to 'tripped' to go
up. Cool them off very much and they self-destruct
never transition and will self destruct.
You can't glue them down for vibration resistance.
I poked around on Digikey and found this new kid on
the PolySwitch block . . .
http://tinyurl.com/he3j2jp
Emacs!
Seems to fit into the standard Mini-ATC fuse holder.
Only found the one size. Will carry 8A at 25C but
takes as much as 8 seconds at at 40A . . . REALLY
slow even for a 10A thermal breaker.
I've used these things in surface mount versions
to protect ECB traces at sub-amp trips . . . but I
don't see that they're yet ready for prime time in
power distribution.
Bob . . .
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|