md94
Posts: 98
Joined: Tue Oct 03, 2006 8:23 am

Overspeed Warning FSX

Wed Oct 25, 2006 6:36 am

Okay,

I've tried to find where to shut off the "overspeed" warning, but I have been unsuccessful. It is starting to drive me crazy. Can anyone please tell me how to silence it?

What are the basics about IAS and Mach. I read some in the other forums, but it did not help with all of my questions. Is there a chart somewhere to give me the proper speeds?

Thank you.
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gunsontheroof
Posts: 3226
Joined: Wed Jan 04, 2006 8:30 am

RE: Overspeed Warning FSX

Wed Oct 25, 2006 6:41 am

Quoting Md94 (Thread starter):

What are the basics about IAS and Mach. I read some in the other forums, but it did not help with all of my questions. Is there a chart somewhere to give me the proper speeds?

The red/white stripped needle on your airspeed indicator shows what speed is going to be "overspeed". It gets lower as you gain altitude, so keep an eye on it and keep your airspeed below it.
 
md94
Posts: 98
Joined: Tue Oct 03, 2006 8:23 am

RE: Overspeed Warning FSX

Wed Oct 25, 2006 6:46 am

How about in glass cockpits, like the CRJ700 I'm in now?
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Cadet57
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RE: Overspeed Warning FSX

Wed Oct 25, 2006 6:55 am

Quoting Md94 (Thread starter):
Can anyone please tell me how to silence it?

Slow down?
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KPDX
Posts: 2373
Joined: Wed Dec 14, 2005 10:04 am

RE: Overspeed Warning FSX

Wed Oct 25, 2006 7:37 am

Quoting Cadet57 (Reply 3):

 rotfl  Well thats the easy way right?  Wink

KPDX  Smile
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ATAIndy
Posts: 622
Joined: Sat May 15, 2004 11:05 am

RE: Overspeed Warning FSX

Wed Oct 25, 2006 8:43 am

Quoting KPDX (Reply 4):
Well thats the easy way right? Wink

Hmm... I was thinking it was the right way  Wink

-Feister
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jdl1527
Posts: 51
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RE: Overspeed Warning FSX

Wed Oct 25, 2006 3:06 pm

/ always works

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goinv
Posts: 255
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RE: Overspeed Warning FSX

Wed Oct 25, 2006 8:11 pm

Quoting Md94 (Thread starter):
What are the basics about IAS and Mach.

This is my laymens view on IAS and Mach.

Imagine the air to full of particles. Lets say that at sea level the air is most dense. So 400mph (or knots) really does give you an IAS of 400mph.

The "speedomoter" on an aircraft measures the flow of these particles over the skin of the airframe.

As you get higher the air gets thinner.

So at 10000ft, going 400mph, you may only have 90% of the particles flowing over the airframe. This would give you an indicated airspeed of 360mph

At 35000ft the number of particles may only be 60% of those at sea level. So the same 400mph would give you an IAS of 240mph.

The speed at which you are travelling over the earth remains the same - you're doing 400mph - it's just that the "imaginary" particles are less dense the higher you go.

It therefore makes sense to measure speed in a different unit - this is known as Mach.

Hope this helps
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md94
Posts: 98
Joined: Tue Oct 03, 2006 8:23 am

RE: Overspeed Warning FSX

Wed Oct 25, 2006 11:28 pm

Okay thanks, that helps.

I spent a lot of time of trial and error last night figuring it out on the different aircraft. I finally saw the IAS indicator on the A321 speed indicator screen. Now I have to figure out the autopilot on the A321...but that will be another night at the controls.

Thanks for the help!!!  Smile  Smile  Smile
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chksix
Posts: 336
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RE: Overspeed Warning FSX

Thu Oct 26, 2006 8:43 am

I do like this in the 737:
Climb up to 10 000 ft at 250 KIAS on the speed setting.
Above 10 000 to about flightlevel 330 climb at 280 KIAS.
At that altitude, switch to Mach 0.78 while climbing to your final altitude.

When leveled off, set your economic cruise speed. (.78 to .85 or higher, depends on aircraft type)

(That final altitude depends mostly on your current weight, a MTOW 737NG has to stop climbing at FL330; a very light one can go all the way to FL410)

[Edited 2006-10-26 01:45:03]
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flinhion757
Posts: 229
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RE: Overspeed Warning FSX

Thu Oct 26, 2006 10:02 pm

Set the Autopilot to about 375 IAS and do Autothrottle and that should keep it about 10kts below the speed you want.[You will need Autothrottle BEFORE you try IAS/Speed hold]
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David L
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RE: Overspeed Warning FSX

Fri Oct 27, 2006 3:30 am

Quoting Flinhion757 (Reply 10):
Set the Autopilot to about 375 IAS

I'm no expert but... that seems a bit high to me. Cruising at M 0.78 usually gets me about 300-320 kts IAS. It would need to be less for a good climb.

Quoting Md94 (Thread starter):
What are the basics about IAS and Mach.

Further to Goinv's post, IAS tells you how the aircraft will behave in the air. Broadly speaking, it will fly in the same manner at 300 KIAS at 10,000 ft as it will at 300 KIAS at 30,000 ft, even though the actual (true) airspeeds will be quite different at those two altitudes.

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