I have recently become aware that Vne is normally expressed in True Airspeed
(TAS).
According to Derek Piggotts Gliding text, it is important to limit indicated
airspeed so the true airspeed is kept below the Vne placard speed. Otherwise
there may be risk of flutter and structural failure.
My XS Owners Manual states that Vne is 165 kts (page 2-1, issue 1). The same
manual
states that for a 914 typical performance is Cruise speed (100% @ 10,000
ft) 170 kts TAS (page 12-2, issue 1). But that is 5 kts greater than Vne!!
That page also states Top Speed (sea level) 144 kts RAS. What is RAS? Is it
a typing error (R is adjacent to T on a keyboard)? RAS is also referred to on
the 912 performance page.
What are the performance numbers for the MG? Brochure says 151 kts TAS max
cruise
speed for 914 at 10000 ft. So is 151 KTAS Vne?
It is very easy to exceed 165 KTAS when descending from altitude. Should this
be avoided?
Jim Butcher
XS N241BW
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