[simpits-tech] Gun Sight update

[Gene Buckle]

*boggle*

I think I have now seen it all.

So Craig, how *are* you planning on doing your hair?  *rofl*

g.


On Sat, 18 Jan 2003, Keenan Akin wrote:

> Dear Amber,
>         Just got your e-mail! I can't wait 'til the party! What are you
> going to wear? I'm going to wear my blue jeans and a cute shirt. How are
> you going to do your hair? Maybe you could give me an idea. I'm debating
> on whether I should do a messy bun or not. I love getting to e-mail
> someone! No one's ever e-mailed me before. Hope you can respond before
> the party. See you then!
>
>                                                                     Bye!
>
> P.S. Do you like my husky e-mail logo? I do. It kind of looks like a
> wolf howling.
>
>
>
> Craig Rochester wrote:
>
> > If you find an optic expert (maybe a forum), please let me know .
> > I've been plugging away at studying the subject and have lots of
> > questions.
> >
> >
> >
> > I found a reference to A-10's HUD design in: "Visual Instrumentation,
> > Optical Design and Engineering Principles, Pantazis Mouroulis-
> > McGraw/Hill Handbooks"
> >
> >
> >
> > My typing:
> >
> > "...The HUD concept calls for the projection of data to the pilot's
> > eyes from the face of a CRT that is located in the vicinity of his
> > (pilot's) knees.
> >
> >
> >
> > Projected data may involve flight instrumentation information, such as
> > speed, altitude...the data is displayed on the CRT face; is collimated
> > (projected to infinity) by a high-quality lens system; and then is
> > reflected to the pilot's eyes via a beam-splitting plate called a
> > combining glass.  This combining glass will have a dichroic coating on
> > one surface, designed specifically to reflect the wavelength
> > (generally quite monochromatic) of the CRT.  This eliminates the need
> > for correction of chromatic aberrations in the HUD lens design.
> >
> >
> >
> > Unique to the HUD optics is the fact that the exit pupil of the lens
> > is located at the pilot's head, a considerable distance from the
> > projection lens itself.  Also unique is the fact that, while the HUD
> > lens will generally be quite large, with a very fast f-number, the
> > actual system pupil size is determined by the size, spacing and
> > location of the pilot's eyes..."
> >
> >
> >
> > This link has some info too:
> >
> > http://www.usaarl.army.mil/hmdbook/cp_003.htm
> >
> >
> >
> > Craig R.
> >
> >     -----Original Message-----
> >     From: simpits-tech-admin@simpits.org
> >     [mailto:simpits-tech-admin@simpits.org] On Behalf Of Keenan Akin
> >     Sent: Saturday, January 18, 2003 10:56 AM
> >     To: simpits-tech@simpits.org
> >     Subject: Re: [simpits-tech] Gun Sight update
> >
> >     As far as the internal optical details, I'm not sure.  I am a crew
> >     station designer but I am not an optics expert.
> >
> >     K
> >
> >     Matt Bailey wrote:
> >
> >>How did it work in real life?
> >>
> >>	-Matt Bailey
> >>
> >>On Fri, 2003-01-17 at 20:49, Keenan Akin wrote:
> >>
> >>>Just received my gun sight reflector glass from Surplus Shed.  Looks
> >>>very nice.  However, when I tried it out, I had the same problem as with
> >>>the plexiglas (double image).  Initially disappointed, I experimented
> >>>around with various lenses and such and I think I may have stumbled upon
> >>>something.  When I hold the reflector about 20 inches away from the
> >>>reticle source and hold a fresnel lens (the cheap plastic type used for
> >>>reading small type), the double image seems to go away.  Of course, the
> >>>reticle image is way too big at this point.  So, my next step is to make
> >>>a very small reticle.  This should allow me to place the lens and the
> >>>reflector in their appropriate location and produce the correct size
> >>>reticle reflection.  Stay tuned for developments.
> >>>
> >>>Keenan
> >>>
> >>
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> >>
> >>.
> >>
> >
>
>