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April 4th, 2004, 15:31
| #1 |
| Junior Member Join Date: Jul 2003
Posts: 188
|  Machmeter
What is the diference between a machmeter and ASI? :confused Tnx lot |
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April 4th, 2004, 15:52
| #2 |
| Senior Member  Join Date: Feb 2004 Location: Peterborough, NH
Posts: 1,281
| Re: Machmeter
Maybe one of the military/ bizjet guys can back me up, but it's basically an ASI that indicates MACH relation... ie. Mach .85. The intricate part of it is that the speed of sound drops as altitude goes up... so the Mach indicator also gets an altitude input, so it can relate the aircraft speed to the speed of sound at that particular altitude. |
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April 4th, 2004, 15:55
| #3 |
| Senior Member  Join Date: Jul 2002 Location: Texas
Posts: 514
| Re: Machmeter
Mach meter is connected to an air data computer that considers temp, alt, and indicated airspeed to determine the mach number. A mach meter is typicaly intergrated into an airspeed indicator, the indicated airspeed is fixed and the mach meter moves as conditions change.   Here you can see a mach meter in action...on the ground you can that the mach scale is barely showing, however, once at FL350 the mach scale has come down and even at 240kts we are still going .71. |
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April 4th, 2004, 15:58
| #4 |
| Senior Member Join Date: Feb 2004 Location: Peterborough, NH
Posts: 1,281
| Re: Machmeter
[ QUOTE ] Mach meter is connected to an air data computer that considers temp, alt, and indicated airspeed to determine the mach number. A mach meter is typicaly intergrated into an airspeed indicator, the indicated airspeed is fixed and the mach meter moves as conditions change. [/ QUOTE ] Yeah, Temp, that's what I forgot! Thanks!  |
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April 4th, 2004, 18:30
| #5 |
| Senior Member  Join Date: Jan 2003 Location: Low Earth Orbit
Posts: 1,389
| Re: Machmeter
Cough, cough....nudge, nudge.... FL350....altimeter 30.00? |
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April 4th, 2004, 18:40
| #6 |
| Old Skool  Join Date: Sep 2003
Posts: 1,886
| Re: Machmeter
That must have been a test, NJA. You passed!
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April 4th, 2004, 18:49
| #7 |
| Senior Member Join Date: Jul 2002 Location: Texas
Posts: 514
| Re: Machmeter
Yeah, yeah, I knew it wouldn't be long before someone pointed that out. I'll bet on your nice new aircraft both altimeters read the same at cruise altitude, but in our aircraft we try to set the right-hand alt. to match whatever the left-hand alt is showing...as you can see I still have to adjust mine a little. RVSM will take care of this little problem however. |
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April 4th, 2004, 19:36
| #8 |
| Senior Member Join Date: Jan 2003 Location: Low Earth Orbit
Posts: 1,389
| Re: Machmeter
Hey, by the way.... What are those funny looking round things that have arms like a clock, and numbers around the edges?????  |
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April 4th, 2004, 21:49
| #9 |
| Junior Member Join Date: Jul 2003
Posts: 188
| Re: Machmeter
Thanks so much for answers  |
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April 5th, 2004, 00:09
| #11 |
| Administrator  Join Date: Feb 2003 Location: Pinal Airpark
Posts: 6,897
| Re: Machmeter
[ QUOTE ] Hey, by the way.... What are those funny looking round things that have arms like a clock, and numbers around the edges????? [/ QUOTE ] ....You candy-ass MFD babies. About as bad as our candy-ass, ascot-wearing, HUD-babies in fighters.... To be fair, though, guess I can't throw too many stones since I'm going to be dragged kicking and screaming into the MFD/autopilot world in less than 30 days. May as well dump the AF pilot wings. I'll essentially be an AF Navigator with landing currency.  |
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April 5th, 2004, 12:35
| #12 |
| Old Skool Join Date: Dec 2002 Location: Utopia
Posts: 12,567
| Re: Machmeter
[ QUOTE ] May as well dump the AF pilot wings. I'll essentially be an AF Navigator with landing currency. [/ QUOTE ] |
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