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
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: LED light experiment |
> 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
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: | 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
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: | 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
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! --
|