Cocorde overspeed at 400 knots?

[alb469]

I installed the ConcX and it flies very well. but the over speed light comes on just over 400 knots when its redlined at over 1100 kts and cruise speed at mach 2. I have tried it at various altitudes but it stays on.Is there any way to fix it so it gives you a correct reading when you are actually over speeding the concorde

[Daube]

Overspeed at 400 knot air speed.
Cruise at 1100 knots ground speed.
Learn the difference

The fact is, when you fly at 300 knots IAS (indicated air speed ?) at 5.000 feet, you're much slower than when you fly at 300 knots IAS at 40.000 feet.

Air is less dense at high altitude, so your plane flies faster there, even if the airspeed doesn't seem that high on the gauges.

[Brett Hill 2]

Concorde cruise speed is Mach 2.02 which at 60,000ft is about 400kts AS and about 1150kts GS, Overspeed is only calculated using AS which is the amount of air which is passing over the wing at any one time... but as the air is less than half the density at 60,000ft than it is at sea level, you therefore have an AS reads less.

[MiltonShupe]

Adding to the excellent responses above, the following two statements in the aircraft.cfg control overspeeds: (example from the B777)

max_mach                = 0.90   // FL180 and above
max_indicated_speed = 330    // Below FL180   //Red line (KIAS)

Below 18000', you must not exceed 330 KIAS.
Above 18000', you  must not exceed .90

Simple but, you still must respect the 330 KIAS as you climb above FL180 to keep the aircraft from being destroyed by heat and potential turbulence.  You will notice that KIAS readout drops rapidly at higher altitudes so you can continue to throttle up as it declines.

You can change max_mach=2.02 as desired upward to eliminate the overspeed warning.

[tcco94]

Read this...
http://www.simviation.com/cgi-bin/yabb2 ... 1235014906

It took me a while to dig it up so it better be useful to your question since this is the right answer.
Brett Henderson helped me on this question 8-)

[alb469]

Thanks for everyone's help but I have managed to partially solve the problem by changing theairspeed indicator to get a digital readout for more accuracy the overspeed warning came on at 369kts at any altitude which is obviously wrong. I then substituted the cv990A air file as a test after trying many other things. I was then able to fly it after finally getting it in the air to its recommended cruise M2.02 with no overspeed. That is as far as my limited knowledge could take me. There must be a setting in the air file that is wrong but what do you change?Can someone help me on this

[Daube]

Thanks for everyone's help but I have managed to partially solve the problem by changing theairspeed indicator to get a digital readout for more accuracy the overspeed warning came on at 369kts at any altitude which is obviously wrong. I then substituted the cv990A air file as a test after trying many other things. I was then able to fly it after finally getting it in the air to its recommended cruise M2.02 with no overspeed. That is as far as my limited knowledge could take me. There must be a setting in the air file that is wrong but what do you change?Can someone help me on this

You should try to read what we write.
The overspeed that you see is correct.
Fact is, when you are flying at 369 knots at 50.000 feet altitude, you are flying almost at Mach 2 !

[tcco94]

Did you even read the link I sent you?

Why did I even take my time to dig up an old post of mine to help someone out if they aren't going to read it.

[Brett_Henderson]

Did you even read the link I sent you?

Why did I even take my time to dig up an old post of mine to help someone out if they aren't going to read it.

You did well, Grasshopper  [smiley=thumbup.gif]

[Camel_Moe]

Lol, I'm having visions of a Concorde streaking through the sky, and has it's wings begin to tear off,

[tcco94]

Did you even read the link I sent you?

Why did I even take my time to dig up an old post of mine to help someone out if they aren't going to read it.

You did well, Grasshopper

[alb469]

Wow I did not intend to step into a hornets nest. Having never tried the concorde before I was in a learning curve. Yes I understood  what everyone explained to me. what got my curiosity up was why a lot of freeware a/c do not act in the same way. eg what  triggers the over speed warning. Also in case I had a bad down load I re-downloaded the Concx and made no changes except for the engine fix.It worked fine until reaching around 35000 ft when the ac started porpoising and the higher you went the worse it got, reducing the vertical speed from the default 1100ft made no difference nor did varying the air speed or the mach number. Am I still doing something wrong? There was no over speed or stall warning showing and we were still a long way from 60000 ft. Should I have started reducing my vertical speed sooner ?

[tcco94]

Are you saying you were at (example) of 300 knots at 6000ft then when you got up to 35,000ft it started to say you were overspeed?