---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sun 03/02/14: 7 ---------------------------------------------------------- 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 _____________________________________ Time: 01:10:35 AM PST US From: Peter Pengilly Subject: Re: AeroElectric-List: grounds 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 _____________________________________ Time: 12:20:09 PM PST US From: "earl_schroeder@juno.com" Subject: Re: AeroElectric-List: 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 _____________________________________ Time: 12:49:12 PM PST US From: Charlie England Subject: Re: AeroElectric-List: 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 _____________________________________ Time: 01:12:35 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: grounds 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 _____________________________________ Time: 02:11:31 PM PST US From: "Sacha" Subject: RE: AeroElectric-List: 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 _____________________________________ Time: 04:52:53 PM PST US Subject: AeroElectric-List: LAA IMC progress? From: Bill Allen 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 _____________________________________ Time: 06:28:35 PM PST US Subject: Re: AeroElectric-List: grounds From: bob noffs 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 ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.