On 3/23/2022 8:23 AM, Edward Spyker via KRnet wrote:
Ignore true airspeed on the low end and you may fall out of the sky.
Ignore true airspeed on the high end and you may exceed the structural
limits of the airframe.
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
To "fall out of the sky" you basically have to stall or stall / spin.
Stall speed is marked on the ASI and you fly based on "indicated
airspeed". One of the first tests you need to do on your new Bomb Blast
experimental dream machine is to determine the "indicated stall speed",
especially straight ahead, power off stall speed so you know what speeds
to use on approach and landing. Airspeed indicator accuracy, if not
already calibrated, is immaterial at this point as you are in the air
and you need to know where the needle points when the wing give up
lift. Beyond that the pilot needs to understand, on the low end
especially, the effects on stall speed with changes in gross weight and
bank angle. I've never been trained to consider TAS when in the landing
pattern. VNE on the other hand is an issue with totally different
concerns, flutter and over-stressing the airframe to mention just two.
An interesting test for those with "flat glass" that show wind direction
and speed. At altitude, make a standard rate turn of 360 degrees and
note how often the software updates and see if it can keep up and give
the same numbers for the entire turn. Then do a square of , say thirty
second legs, and see if it computes the same numbers for all four legs.
I'm thinking that would be an interesting thing to observe. Just
curious. I'm assuming it simply uses IAS / magnetic heading and compare
that to ground track and speed to compute the numbers. For those of you
that fly that equipment it would be nice for you to do PIREPS to verify
forecast. I often give PIREPs to the local tower on letdown about
turbulence altitude and severity. I hear them giving that info to
departing aircraft for a heads up.
Larry Flesner
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