Simviation Forum - Increasing aircraft overspeed tolerance

Nov 5^th, 2004 at 10:34pm

Gary R. Offline
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What would I have to change in an aircraft.cfg in order to elevate a plane's overspeed limits?

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Reply #1 - Nov 5^th, 2004 at 11:42pm

Milton Offline
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Try changing VMO in the air file, table 1101.

Change also the reference speeds in the cfg file though I'm not sure these override the air file.

Milton&&Dash 7, Aero Commanders, Howard 500, D18S, Spartan, XP47J, Beechcraft A28 (Grizzly)

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Reply #2 - Nov 6^th, 2004 at 3:53am

microlight Offline
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The overspeed tolerance is affected by two parameters in the .air file: Mmo at line 316 (max Mach) and Vmo in the primary aerodynamics section at line 1101 (max airpseed). These control the overspeed depending on what youre altitude is. My experience is that if you're at low altitude then Vmo takes precedence, but at jet cruising altitude then Mmo takes precedence. You can see what the effects of changing the settings are by looking at the 'barber's pole' or equivalent in the airspeed indicator or PFD while you're climbing and accelerating.

To change the values, 1) use AirED (available here), as the MS FSEdit program is full of bugs, 2) back up the original file first, as there are a lot of unknown values in the .air file that few people outside M$ know what they do!

Good luck.

Wink

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Reply #3 - Nov 6^th, 2004 at 3:55am

microlight Offline
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Forgot to mention - the values in the .cfg file reference speed section are intended for planes used as AI - they have no effect on the plane that you are flying.

Wink

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Reply #4 - Nov 6^th, 2004 at 1:25pm

Gary R. Offline
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To microlite. About air-ed. Was that intended to be a link to a sie or did you just mean its in simviation's file server? Thanks

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Reply #5 - Nov 6^th, 2004 at 6:24pm

Travis Offline
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AirEd is available on SimV.

GET IT HERE

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Reply #6 - Nov 6^th, 2004 at 7:40pm

andyjohnston.net Offline
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The numbers in the cfg do indeed have an effect on the aircraft, you don't need to touch the airfile at all, because the ones in the cfg take priority.

I have many aircraft where I've played with the speed tolerances, always using the cfg, I've never even looked for it in the air file.

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Reply #7 - Nov 7^th, 2004 at 7:23am

Meteorit-N Offline
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Quote:

The overspeed tolerance is affected by two parameters in the .air file: Mmo at line 316 (max Mach) and Vmo in the primary aerodynamics section at line 1101 (max airpseed). These control the overspeed depending on what youre altitude is. My experience is that if you're at low altitude then Vmo takes precedence, but at jet cruising altitude then Mmo takes precedence. You can see what the effects of changing the settings are by looking at the 'barber's pole' or equivalent in the airspeed indicator or PFD while you're climbing and accelerating.

I've set the Mmo value to the maximum allowed ie. Mach 3.1999 and the Vmo value to 2500 kts, but the overspeed warning of my Tu-360 still sets off at 300-400 kts. What's wrong? It's quite annoying.

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Reply #8 - Nov 7^th, 2004 at 2:31pm

aceronzo Offline
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Change the "max_indicated_speed=" in the .cfg file with notepad.I allways add about 15 more knots to it.

EXAMPLE:
[Reference Speeds]
flaps_up_stall_speed=your specs
full_flaps_stall_speed=your specs
cruise_speed=your specs
max_indicated_speed=415.0
max_mach=0.8

Adjust as needed

aceronzo

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