- ALL planes show a discrepancy between the HUD speed readout and ASI
on the panel. If the HUD shows IAS, why does the ASI show less at
altitude? (They agree at sea level.)
The HUD shows CAS, actually. We're not modelling errors deliberately
right now, but eventually the ASI
Major A writes:
OK, but the IAS and CAS should be reasonably close to each other. I
think the difference is simply too big, and it also increases with
altitude like that between TAS and IAS should. I don't think 260 KIAS
can lead to 320 KCAS at 12000ft, which I just got when flying the
OK, but the IAS and CAS should be reasonably close to each other. I
think the difference is simply too big, and it also increases with
altitude like that between TAS and IAS should. I don't think 260 KIAS
can lead to 320 KCAS at 12000ft, which I just got when flying the
747-yasim.
My UUCP connection is broken this afternoon, so I can't directly reply to
dave's mail. Nevertheless I tried his patch - yet without success:
OK, I think I've fixed it now - if you could try it again that would be great.
Seems to be OK now.
I've just tested a few planes. Here is what I
