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The trusty NG, or other Boeing products that I have flown do not have the donut. The speed tape in turbulent conditions can be quite an effort to read. As you know the information presented on the PFD goes through alot of information processing before you see it. Starting with Bernoullies, converted to googoo-fonics in the ADIRU then off to the symbol generator and voila the PFD. The standby ASI is a lot less jumpy.Originally Posted by KC10 FATboy
As for speeds, I always fly off the ADI, you have speed, azimuth, and glideslope all in one place. The speed donut which I believe in most airplanes references ADCs and inertial accelerometers, in my opinion, is the best way of managing speed while on approach and landing. The airspeed indicator can be erratic durng gusts and will have you chasing power all the way down.