Today's Message Index:
----------------------
1. 01:10 AM - Re: grounds (Peter Pengilly)
2. 12:20 PM - Re: Official AeroElectric-List FAQ (Frequently Aske d Questions) (earl_schroeder@juno.com)
3. 12:49 PM - Re: Official AeroElectric-List FAQ (Frequently Aske d Questions) (Charlie England)
4. 01:12 PM - Re: grounds (Robert L. Nuckolls, III)
5. 02:11 PM - Re: noise problem on radio (Sacha)
6. 04:52 PM - LAA IMC progress? (Bill Allen)
7. 06:28 PM - Re: grounds (bob noffs)
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 |
|
In general 1 No, 2 Yes, but,
The power supply wire to a wing tip will be 15 or 20' long, so you may
choose to use a thicker wire size because of volts drop, rather than
current carrying, considerations. If the ground wire is grounded to the
spar 1' away then the volts drop considerations are not relevant and a
thinner ground wire may be used.
Using airframe ground return for the kind of wing tip mounted devices
you mention is standard practice in a metal airframe and can result in
significant weight savings (which are always important) - always
assuming you have a good ground path back to the battery. Take care of
potential ground loops for items in the panel that are sensitive (eg
audio devices).
Just my opinion,
Peter
On 01/03/2014 22:25, bob noffs wrote:
> hi all,
> i have 2 questions about the led landing light and led strobe i am
> installing in a metal wing.
> #1 is it acceptable to use next size smaller groung wire compared to
> power supply??
> #2 is it acceptable to ground these lights to the airframe?
> thanks for any info.
> bob noffs
> *
>
>
> *
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: Official AeroElectric-List FAQ (Frequently Aske |
d Questions)
Hi Matt,
It appears that MS no longer supports XP..... http://www.microsoft.com/w
indowsxp/downloads/powertoys/xppowertoys.mspx Anyhow, I could not get th
e above link to work for me. They do offer a resizing app for Win 8 how
ever. Just a FYI, Earl
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: Official AeroElectric-List FAQ (Frequently Aske |
d Questions)
On 3/2/2014 2:16 PM, earl_schroeder@juno.com wrote:
> Hi Matt,
>
> It appears that MS no longer supports XP.....
> http://www.microsoft.com/windowsxp/downloads/powertoys/xppowertoys.mspx
> Anyhow, I could not get the above link to work for me. They do offer
> a resizing app for Win 8 however.
> Just a FYI, Earl
>
Try here:
http://windows.microsoft.com/en-US/windows/xp-downloads#2TC=powertoys
Like most companies, they move links around without including pointers
to the new location.
After loading the page, point at the resize download link, right click,
& 'save as' to where ever you can find it after downloading (usually
defaults to your downloads folder).
If you don't have any luck, ask & someone (me) can email you a copy of
the .exe file, if you trust us. :-)
Charlie
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 |
|
At 04:25 PM 3/1/2014, you wrote:
>hi all,
> i have 2 questions about the led landing light and led strobe i am
> installing in a metal wing.
> #1 is it acceptable to use next size smaller groung wire compared
> to power supply??
> #2 is it acceptable to ground these lights to the airframe?
> thanks for any info.
> bob noffs
The current demand of LED replacement for legacy
lighting is generally much smaller. You should tailor
your wire selections to those values . . . assuming
of course . . . that larger wires are not already
installed to service a legacy system being replaced.
In the later case, leave old wires in place.
Have you read chapter 5 of the 'Connection and
reviewed Z-15 and in particular, this drawing?
http://tinyurl.com/6w87rvb
Voltage drop is not a big issue with modern
LED fixtures fitted with constant current
power supplies . . . and the BRIGHT fixtures
fall into this category. The electronics in
the fixture insures proper lamp drive over a
wide range of input voltages.
Concerns for ground-loop induced noises have
foundation in poorly crafted grounds for VULNERABLE
systems. You can generally ground potentially
antagonistic systems anywhere as long as the
potential victims (generally all on the panel)
share a local common ground as depicted in the
Z-15 drawings.
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: | noise problem on radio |
No, I haven't. Is it worth getting my hands on an SWR meter?
If your shield ground is loose at the radio, it can open a
pathway for conducting otherwise insignificant
signals into the receiver.
If you don't have ready access to one, hold off acquiring
it. But check the mechanical integrity of your coax
connections at the back of the radio. How well does the
comm transceiver work?
I don't have enough experience with it yet. In Italy, ultralights can only
speak to other such a/c on 130 MHz. You need to acquire an "advanced"
ultralight license (which costs approx.. $2000) to be able to talk to
anybody else. It's all part of the ridiculous regulation we endure here.
Have you detected any shortfall in performance?
(In my limited experience), not so far.
http://www.trioavionics.com/Pro%20Pilot%20Manual%203.8.pdf
Okay . . . that's a busy little box. Refresh my
memory, is this noise a new thing or has it always
been present.
I only noticed it in the last 10 hours or so, but the a/c only has 30 hours
or so since I rebuilt it, and I wasn't particularly concentrating on the use
of the radio initially since a) there's hardly any other traffic around and
b) I'm limited to the ultralight air-to-air frequency in any case.
Also, when receiving a weak signal (tune in an ATIS and fly away from
airport until
signal starts to get noisy . . . then turn a/p
on/off and judge how much effect the a/p noise
has on reception of weak signals).
I will try that next time.
[...] My sense of the situation from your narrative
so far is that while the A/P is a noteworthy
contributor . . . it's not the sole potential
antagonist . . . we may discover that it is
within practical limits and you just need to
tighten the squelch on the receiver a tad.
I'll try that next time too.
I think I've related my experiences with the
symphony of noises that are often heard in
various systems while sitting on the ground
with engines off and wearing headphones . . .
noises that are completely insignificant
while in flight.
Let's size the task before we get out hammers-
n-saws.
Bob . . .
What you say makes sense. I'm going to be away from the hangar for a few
weeks (I'm actually going to New Mexico for a job interview and then to
Socal to see some friends), so I'll pick the thread up again when I get
back.
Sacha
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: | LAA IMC progress? |
Hi Peter,
Just wondering if the ratchet has clicked along any more regarding the
LAA/CAA IMC approval for homebuilts.
I've heard absolutely nothing from FD since I wrote in requesting clearance
on 7th November...
regards,
Bill Allen
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 |
|
thanks for the advice. i built my last plane using your diagrams. i now
have a plan!
bob noffs
On Sun, Mar 2, 2014 at 3:11 PM, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> nuckolls.bob@aeroelectric.com>
>
>
> At 04:25 PM 3/1/2014, you wrote:
>
>> hi all,
>> i have 2 questions about the led landing light and led strobe i am
>> installing in a metal wing.
>> #1 is it acceptable to use next size smaller groung wire compared to
>> power supply??
>> #2 is it acceptable to ground these lights to the airframe?
>> thanks for any info.
>> bob noffs
>>
>
> The current demand of LED replacement for legacy
> lighting is generally much smaller. You should tailor
> your wire selections to those values . . . assuming
> of course . . . that larger wires are not already
> installed to service a legacy system being replaced.
> In the later case, leave old wires in place.
>
> Have you read chapter 5 of the 'Connection and
> reviewed Z-15 and in particular, this drawing?
>
> http://tinyurl.com/6w87rvb
>
> Voltage drop is not a big issue with modern
> LED fixtures fitted with constant current
> power supplies . . . and the BRIGHT fixtures
> fall into this category. The electronics in
> the fixture insures proper lamp drive over a
> wide range of input voltages.
>
> Concerns for ground-loop induced noises have
> foundation in poorly crafted grounds for VULNERABLE
> systems. You can generally ground potentially
> antagonistic systems anywhere as long as the
> potential victims (generally all on the panel)
> share a local common ground as depicted in the
> Z-15 drawings.
>
>
> 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! --
|