How does your HUD work?
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Join Date: Apr 2004
Location: England
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How does your HUD work?
How does your HUD work at high AoA when the climb dive marker or velocity vector reaches the bottom of the field of view?
This might be more of a tech log question but I am interested in replies from fast jet and advanced trainer pilots.
The HUDs that I am familiar with revert to a pitch reference so maintaining a conformal pitch ladder. A supplier is proposing that the climb dive ladder is mainained throughout so that even with a field of view limited climb dive marker the climb dive ladder will be valid. This means that as you reach an AoA high enough for the CDM / VV to reach the bottom of the display the horizon line will move up off the true horizon and the ladder will not conform to the outside world.
Do any of you fly a HUD like this? Does it present you any problems during unusual attitude recoveries?
Thanks in advance.
This might be more of a tech log question but I am interested in replies from fast jet and advanced trainer pilots.
The HUDs that I am familiar with revert to a pitch reference so maintaining a conformal pitch ladder. A supplier is proposing that the climb dive ladder is mainained throughout so that even with a field of view limited climb dive marker the climb dive ladder will be valid. This means that as you reach an AoA high enough for the CDM / VV to reach the bottom of the display the horizon line will move up off the true horizon and the ladder will not conform to the outside world.
Do any of you fly a HUD like this? Does it present you any problems during unusual attitude recoveries?
Thanks in advance.
Join Date: Jun 2001
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UP recoveries = on the head down attitude indicator. The HUD laddering effect when pitching quickly makes it relatively usless to assess pitch angle.
AoA still works fine - pull to the limit and get the nose above the horison!
VV I don't care about since the vector is changing so fast at high pitch rates
Designing a HUD that does not relate to the horizon seems a good one to patent on 1 April for use by the swiss navy! You really will have to explain how that could be of use
AoA still works fine - pull to the limit and get the nose above the horison!
VV I don't care about since the vector is changing so fast at high pitch rates
Designing a HUD that does not relate to the horizon seems a good one to patent on 1 April for use by the swiss navy! You really will have to explain how that could be of use
Join Date: Dec 2000
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In both the UK and US type HUDs I've flown with, the CDA/FPM/velocity vector - whatever you want to call it - falls off the bottom of the HUD at high AoA. Not ideal, but seems to be the best of a bad lot of options. I don't think I would like a horizon line that didn't reflect the real horizon - as I alluded to in the previous sentence I would rather lose the FPM than the true horizon line. The very modern American HUD I've flown with was extremely annoying because at high AoA the compass strip disappears off the bottom of the HUD along with the FPM! Turning hard, you would have to look head-down for your roll-out heading whilst getting the rest of the information from the HUD. What were they thinking?
