Indeed, but it must have been true airspeed. The indicated airspeed
is around 0.75 of true at 20,000ft. Groundspeed is immaterial, in
general terms, because it changes with the wind ... ;-)
Chris
~~ >-)-
C M I Barker
Cambridgeshire, Great Britain.
+44 (0)7092 251126
www.threeshoes.net
homepage.mac.com/zuiko
On 9 Mar 2007, at 21:27, Walters, Martin wrote:
> That being said, the P-51Ds are usually quoted in that speed range
> (430s). The fastest of the operational Spitfires, the PR XIXs with
> Griffons, could do 450 or so at high altitude. The best of the Merlin
> Spits were a little over 400 at high altitude. The Spits always needed
> more powerful engines than Mustangs to reach similar speeds. One
> reason
> the Spits were not competitive against the Mustang in air racing.
>
> Note that I have not qualified the speeds as ground speed or air speed
> because i) I don't have that info and ii) I get confused with them.
>
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