Nav Light Graphic

WEll, Ernest, to be brutally honest with you, no it doesn't help much. You
simply took each individual segment of the gobbledygook FAR and drew a
picture for each one of them. That's fine; what I'm looking for (and what
Stuart Fields is VERY close to doing) is a composite graphic of ALL the
horizontal requirements onto one graph and ALL the vertical requirements
onto another.

But thanks for trying.

Jim

--
"If you think you can, or think you can't, you're right."
--Henry Ford


"Ernest Christley" wrote in message
...

If anybody has a point to a clear post of the brightness requirements,
I'd sure be interested in seeing it. Sarangen's article on wingtip
lights is about the best I can find, but he duplicates the alpha graph
and says nothing about the theta graph.

Jim


Is this any help?

http://ernest.is-a-geek.org/Delta/Ex...iment_LED.html

--

http://www.ronpaultimeline.com

On May 8, 10:26 am, "RST Engineering" wrote:
WEll, Ernest, to be brutally honest with you, no it doesn't help much. You
simply took each individual segment of the gobbledygook FAR and drew a
picture for each one of them. That's fine; what I'm looking for (and what
Stuart Fields is VERY close to doing) is a composite graphic of ALL the
horizontal requirements onto one graph and ALL the vertical requirements
onto another.

But thanks for trying.

Jim

--
"If you think you can, or think you can't, you're right."
--Henry Ford

"Ernest Christley" wrote in message

...

If anybody has a point to a clear post of the brightness requirements,
I'd sure be interested in seeing it. Sarangen's article on wingtip
lights is about the best I can find, but he duplicates the alpha graph
and says nothing about the theta graph.

Jim


FAR 23.1391 specifies theta (from dead ahead in horizontal plane) and
23.1393 specifies alpha (above or below horizontal plane). Therefore
the first table is for alpha=0. The second table is simply a scale
factor to figure out the alpha-distribution for each theta. This is
why the first table is given in Candles and the second table has no
units with the max value of 1.0. Basically, to figure out the minimum
intensity for a given theta and alpha, multiply the two numbers from
each table. One should be able to create a 3D plot from this.

Andrew...

I agree with your FAR references, Andrew, but in an article you wrote
entitled "Europa Nav Lights Using Luxeon Leds", page 11, (undated) you have
two graphs. One is for theta = 0° and one is for theta = 90°. Both graphs
are for alpha (x axis) versus candelas (y axis). You further define candela
on the y axis as lumens/steradian.

If you have a subsequent article that clarifies or extends the data in this
article I reference, I'd sure like to see it. The "Europa..." article is
the only one I could find.

I'll be happy to port you the preprint articles for Kitplanes this year
July, August, and September for your review and comment if you like. The
October, and final chapter, is a work in progress, but it only has details
on the power supply and nothing on the light distribution.

Jim

--
"It is the mark of an educated mind to be able to entertain a thought
without accepting it."
--Aristotle


"Andrew Sarangan" wrote in message
news:4785ec47-9bbe-4f4a-b1a5- FAR 23.1391 specifies theta (from dead ahead
in horizontal plane) and


23.1393 specifies alpha (above or below horizontal plane). Therefore
the first table is for alpha=0. The second table is simply a scale
factor to figure out the alpha-distribution for each theta. This is
why the first table is given in Candles and the second table has no
units with the max value of 1.0. Basically, to figure out the minimum
intensity for a given theta and alpha, multiply the two numbers from
each table. One should be able to create a 3D plot from this.

Jim

I added a small section to the same article to hopefully answer some
of your questions. I had no idea that it would be read by anyone
except a handful of Europa builders, but I am glad to help if needed.
http://www.sarangan.org/aviation/eur...tip-Lights.pdf


On May 14, 9:48 am, "RST Engineering" wrote:
Andrew...

I agree with your FAR references, Andrew, but in an article you wrote
entitled "Europa Nav Lights Using Luxeon Leds", page 11, (undated) you have
two graphs. One is for theta = 0° and one is for theta = 90°. Both graphs
are for alpha (x axis) versus candelas (y axis). You further define candela
on the y axis as lumens/steradian.

If you have a subsequent article that clarifies or extends the data in this
article I reference, I'd sure like to see it. The "Europa..." article is
the only one I could find.

I'll be happy to port you the preprint articles for Kitplanes this year
July, August, and September for your review and comment if you like. The
October, and final chapter, is a work in progress, but it only has details
on the power supply and nothing on the light distribution.

Jim

--
"It is the mark of an educated mind to be able to entertain a thought
without accepting it."
--Aristotle

"Andrew Sarangan" wrote in message

news:4785ec47-9bbe-4f4a-b1a5- FAR 23.1391 specifies theta (from dead ahead
in horizontal plane) and

23.1393 specifies alpha (above or below horizontal plane). Therefore
the first table is for alpha=0. The second table is simply a scale
factor to figure out the alpha-distribution for each theta. This is
why the first table is given in Candles and the second table has no
units with the max value of 1.0. Basically, to figure out the minimum
intensity for a given theta and alpha, multiply the two numbers from
each table. One should be able to create a 3D plot from this.

On Wed, 14 May 2008 06:48:44 -0700, "RST Engineering"
wrote:

Andrew...

I agree with your FAR references, Andrew, but in an article you wrote
entitled "Europa Nav Lights Using Luxeon Leds", page 11, (undated) you have
two graphs. One is for theta = 0° and one is for theta = 90°. Both graphs
are for alpha (x axis) versus candelas (y axis). You further define candela
on the y axis as lumens/steradian.

If you have a subsequent article that clarifies or extends the data in this
article I reference, I'd sure like to see it. The "Europa..." article is
the only one I could find.

I'll be happy to port you the preprint articles for Kitplanes this year
July, August, and September for your review and comment if you like. The
October, and final chapter, is a work in progress, but it only has details
on the power supply and nothing on the light distribution.

Jim


what is a steradian ??????