320/360/390 drivers in the 320/360 fuselage:

 

235 KIAS = Vne, assuming that a good static port is used, then also assume KCAS = KEAS = KIAS

 

Here are some interesting data points:

 

Assume indicated altitude = Palt = Dalt and Baro = 29.92 

 

at 17,000 ft. and -18C, 180 KIAS = 235 KTAS

 

at 10,000 ft. and -5C, 201 KIAS = 234 KTAS

 

at 5,000 ft. and 5C, 217 KIAS = 234 KTAS

 

As a practice (and not based on any logical reasoning) I normally descend from most altitudes at a comfortable 180 KIAS.  I haven't been over 11,000 feet since the last Redmond Labor Day fly in (several years ago) that would have required high flight over the smoke and mountains.  I don't remember descent air speeds from those higher altitudes.

 

BTW, my NA 170 HP engine will not quite get me to the destructive Vne in cruise.  When I raced cross country (2000 to 4000 ft), I have achieved 205 KIAS. On a hot day that might be 217 KTAS.

 

I feel so much better now.

 

Scott Krueger AKA Grayhawk