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Speed penalty below 10000 feet

Posted: Mon Oct 13, 2008 10:23 am
by Jos Gielen
On two flights now with client 1.0.4 I've had speed penalties below 10000 feet while I was on an altitude of almost 110000 feet.
It seems like the client is checking the above ground level.

Kind regards,

Jos Gielen, CEO - DutchAir (VA ID:3998)

Re: Speed penalty below 10000 feet

Posted: Mon Oct 13, 2008 12:17 pm
by hezza
while I was on an altitude of almost 110000 feet
Wow, what type of aircraft was that? SR71? ;)
Seriously though, I believe the speed penalty applies not below A100 but rather F100, which can be over 11000ft according to atmospheric conditions.
(I have been wrong before though).

Re: Speed penalty below 10000 feet

Posted: Mon Oct 13, 2008 2:55 pm
by Jos Gielen
Whoops, nice typo :-)
But, last time it happened over the USA, so the altimeters where already set to local pressure, I checked with [shift]-z to see my real altitude and that was around 10,700 feet so I still think the client was off here, my solution for the time being is decelerating a little bit earlier, I now make sure I'm at 240 knots at 11,500 feet to avoid the penalty, but I hope this will be a temporary workaround.

Re: Speed penalty below 10000 feet

Posted: Tue Oct 14, 2008 10:45 am
by Konny
The client uses the altitude above sea level in standard atmosphere conditions ( altimeter set to 29.92 / 1013.25 ), aka FlightLevel, which differs from the 'real' altitude ( radar altitude, what you would get from your GPS or if you set the altimeter to local conditions / 'press b in MSFS' ).
So be sure to set your altimeter to 29.92/1013.25 when getting close to 10.000 feet. I think standard procedures mostly have a lower transition level which should give you enough tolerance.

Re: Speed penalty below 10000 feet

Posted: Tue Oct 14, 2008 12:01 pm
by hezza
I think standard procedures mostly have a lower transition level which should give you enough tolerance.
Notable exceptions being of course USA/Canada where TA is 18000, and Mexico where it is 18500.

Re: Speed penalty below 10000 feet

Posted: Tue Oct 14, 2008 2:36 pm
by CAPFlyer
And several countries around the Pacific Basin and southern Europe...