AeroElectric-List Digest Archive

Mon 01/28/13


Total Messages Posted: 3



Today's Message Index:
----------------------
 
     1. 06:37 AM - Re: LED light experiment (Eric M. Jones)
     2. 02:26 PM - Load Calculations and bus layout for comment (Yahoo hasbroucka)
     3. 10:27 PM - Grounding a Super Cub (Jeff Page)
 
 
 


Message 1


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    Time: 06:37:21 AM PST US
    Subject: Re: LED light experiment
    From: "Eric M. Jones" <emjones@charter.net>
    > This morning my experimenting led to placing a white [6000k] 10 watt LED being a FAA nav green (blue) glass lens. The resultant visible color was not even close to green. Thanks for the tip on the FAA wanting a specific color in wavelengths. At least I know where to start, once back in the lab (basement shop). Mike, The FAA filter is bluish because the original incandescent lamp was yellowish. Bluish + yellowish equals aviation greenish. Abandon any hope of filtering LEDs to get other colors. If you want green, buy 525 nm green. Read my paper on red-green position lights. Learn how to say "spatial distribution". > At least so far, I have the white strobe light (color) nailed down. That's a start! The FAA still likes neon red too. And red has some advantages in LED strobes. Read my paper on LED strobes. > Do you [or anyone reading this] have a suggestion as to how to best measure lumens? Would an older type of photo light-meter work in this case, held a set distance for each test? Read my paper on red-green position lights. It has a very nice and very readable description of how to do the photometry, which gets a lot of people confused. > As well, does any one know why the LED manufacturers use a "flexible clear colloid" to cover the active LED material? Is this an inexpensive way to seal the active material, or something else? I want to mount the end of a polished acrylic rod as close as possible to a LED, for light transmission. This colloid material is fragile. Several LED OEM's have not responded to this question. "Colloid" is Chem-speak for "stuff with other stuff in it". The little LED chip gets very hot and has to be protected. Optical coupling is also the key issue. Materials used are usually high temperature acrylic and for higher temperatures, epoxies and silicones. Mike, A lot of what you are trying has already been done for you. Read everything you can find before trying to invent new stuff. Remember, Nature give you uncountable ways to fool yourself. Science teaches how not to fool ourselves. Good luck. -------- Eric M. Jones www.PerihelionDesign.com 113 Brentwood Drive Southbridge, MA 01550 (508) 764-2072 emjones(at)charter.net Read this topic online here: http://forums.matronics.com/viewtopic.php?p=393158#393158


    Message 2


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    Time: 02:26:09 PM PST US
    From: "Yahoo hasbroucka" <hasbroucka@yahoo.com>
    Subject: Load Calculations and bus layout for comment
    I am developing my first ever wiring plan for a 914 powered SeaRey amphibian kit. It is to be VFR night capable, and definitely will be Dynon SkyView system, two screens (planning only one to have backup battery). I intend to use ATC fuses for most circuits, and utilize Bob's Z-16 drawing. I have attached my load calculations with the best info that I have. I do not know the constant load for the com? I also see a problem with cold night flight, because my load seems to exceed my alternator output with heater and lights running. These SeaRey planes typically have HID landing lights, plus taxi lights (I plan LED landing lights, no taxi lights). I intend to use only the internal alternator on my 914 Rotax, rated at 22a max, 20a at 5000rpm, and Auto pilot is preferred, but will be eliminated if it requires another alternator. This load came as a surprise because other than AP, many are equipped similar to this plan. I called Dynon hoping that the second screen will draw less, but they say it will draw 3 to 3.5a. Plane has electric landing gear, electric trim, sump pump and a 2nd electric fuel pump for take-off, but being intermittent loads, I did not include them in my running load. I would appreciate any input at all, and request help with refining or managing my load to fit the alternator, and also comments on my Buss layout. My landing gear uses 4 small relays, do I understand correctly that even these small relays should have a diode across them for contact life and spike reduction? I will start putting together my wire sizes, and intend to use a max 8% wattage loss to size wires for everything except the starter, and use wire size at 10deg rise to dictate fuse size according to AE Connection chart fig 8-3. Can anyone tell me what to use as the max V-drop when sizing wires? Thanks in advance, Alan , HasbrouckA@yahoo.com SeaRey Amphibian, framework and hull assembled (not covered). Working on VFR avionics and wiring (Dynon Skyview full suite). Top Priority is keep it light, and place weight forward!


    Message 3


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    Time: 10:27:26 PM PST US
    From: Jeff Page <jpx@qenesis.com>
    Subject: Grounding a Super Cub
    A friend of mine is building a tube and fabric aircraft with an O360. The tubes are thin wall 4130. The battery is in the rear. My understanding is that it is normally preferable to ground strap the engine directly to the firewall, rather than to the engine mount, since this avoids putting starter currents through the engine mount. If that is correct, then I wonder whether putting starter currents through the frame is also a bad idea, and running a heavy wire from the battery to the firewall is desirable ? Jeff Page Dream Aircraft Tundra #10




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