RAS is not a commonly used term, but it means Rectified Airspeed, which
is the same as Calibrated Airspeed (CAS). CAS is the Airspeed corrected
for installation errors.
--- "h&jeuropa" <europa@triton.net> wrote:
> <europa@triton.net>
>
> 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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>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=81100#81100
>
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Andrew Sarangan
http://www.sarangan.org
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