![]() It's very easy to read quickly, and it's still used on many MFDs. However the analogue way of presenting information with needles are far from dead. The A and B versions of SAAB Gripen had analogue backup gauges, but these were removed in the C and D version in favour of larger MFDs. An if you have a power failure the aircraft won't be very airworthy anyway. Therse systems have backups and backups for the backups. Steam gauges isn't really necessary for this kind of aircrafts anymore. Perhaps the helmet for the F-35 is really lightweight, but it doesn't look like it. Remember that every added ounce should be multiplied by 9 at maximum G-loads. I know they tested different concepts of HMDs for the SAAB Gripen, but the problem was that the added weight and shift in center of gravity for the helmet was worse than the benefits from the system. But I'm questioning if the benefits make up for the drawbacks. Removing the HUD and replace it with a HMD is an interesting concept. ![]()
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