Answer about collimated display systems

**Craftsman** · 09-11-2013, 01:59 PM

Hi adighob
If you asked about the difference 1028.73 - 1029, it was just rounded up in the drawing.

	mylar mirror:	screen:
Arc Length:	1174.61mm	772.89mm
Chord Length:	1160.71mm	754.84mm
Radius:	2200mm	1028.73mm
Angle:	30.59deg	43.05deg

The values on the table are all the cross section drawing of the collimated display. There is nothing about the plan view. The numbers on the drawing and on the tables are the same. Sorry about rounding up.

**Craftsman** · 09-11-2013, 03:12 PM

Originally Posted by adighob

Can you keep the radius of the mirror 2200 mm in elevation and the radius of the mirror in plan view 1500 mm,
and keep the radius of the screen 1028.73 mm in elevation view and scale the radius of the screen in plan view proportionately to the new mirror radius of 1500mm, keeping the distance between the screen and mirror the same as you have put?

Thanks and Best Regards,

I couldn't understand exactly what you mean above.

We've developed our work based on B737. First 737-800 cockpit has been scanned using the optic 3D scanner. Then Eye Reference Position was found using digitized (scanned) data of the aircraft. The FOV of pilot was defined and we found the radius of mirror by following the instructions on thread "Question about collimated display systems" #78 by Mike.Powel.

We used solidworks and the radius of screen is a function of the radius of mirror.
My point is that we can't change the number as we like.

**adighob** · 09-11-2013, 04:15 PM

I would like to just clarify
In your drawing, I assume it is drawn in the X-Z plane and so:

1-Radius of Mirror is: 2200 mm
2-Radius of Screen is:1028.73

Since you have not drawn a second view in the X-Y plane, my questions are:

1-Is the radius of mirror in X-Z plane = radius of mirror in X-Y plane
2-Is the radius of screen in X-Z plane = radius of screen in X-Y plane

Thanks and Best Regards

**Craftsman** · 09-11-2013, 05:48 PM

There is only one plane and one view on the drawing, it's right side view of the cockpit.
In other words, it's the drawing of vertical "field of view-FOV".
The answer is negative for the questions about radius'.
The horizontal FOV depends on your design criteria and the resources you have such as mylar length of yours. Please read the other threads that explain the design of the screen and the mirror.