[simpits-tech] HUD

[Marv De Beque]

One more hurdle for you is focal length.  Real HUD focal length is something
close to infinity.  That is, when you look at the target (i.e., another
aircraft ahead of you) and the gun funnel on the HUD, both appear at the
same focal distance.

Fore example.  Look out the window your neighbor¹s car and put a newspaper
at arms length from you next to the car¹s image.  When you look at the car
your newspaper is unfocused.  When you focus on the newspaper, the car is
unfocused.

HUDs change the focal length of the projected image to match real world
objects outside the aircraft.  For a simulator you must set the focal length
of the HUD to match the distance to your projection screen so both the real
world display and the HUD are in focus at the same time.

As Rob said, an optical engineer would be a good person to befriend.  ;-)

Marv


On 12/16/03 8:58 PM, "Rob Hommel" <rhommel at tacoma.net> wrote:

> Cedric:
> 
>  
> 
> That is the ten million dollar question. The US Government use what appears to
> be quartz glass the coating on the glass is as yet unidentified by myself. I
> suggested that you obtain the assistance of an optical engineer or experiment
> with coatings until you have the needed information. Edmonds scientific maybe
> some assistance to you.
> 
>  
> 
> Keep Œem Flying
> 
> Rob Hommel
> 
>  
> 
> -----Original Message-----
> From: simpits-tech-bounces at simpits.org
> [mailto:simpits-tech-bounces at simpits.org]On Behalf Of cedric renaud
> Sent: Tuesday, December 16, 2003 3:38 PM
> To: simpits-tech at simpits.org
> Subject: [simpits-tech] HUD
> 
>  
> 
> Hello,
> 
>  
> 
> I seek which size of projection screen used for a HUD of f16 and which type of
> glass used to have the transparency and returns it image.
> 
>  
> 
> Thank you.
> 
> 
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> 


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