Simviation Forums

 I have a question about high flying recently I flew the learjet 45 I was going on a long trip to Ireland but the higher I went the slower my aircraft went I had my autopilot set for a verticle speed of about 1800 feet per minute how can I keep from running out of airspeed I was headed to 45,000ft but I stalled out at about 39,000 then could not go up just down . What should I do to get up to 45,000ft  

1) KIAS should be steady decreasing the higher you go , Mach number shouldn't

2) reduce vertical speed. 1800fpm is quite brisk when climbing at the higher FL300's, even for a sporty learjet  :)

3) reduce your gross weight

4) the air.file may not be an accurate replica of the real world counter part

5) I'm out of suggestions  ;D

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stick with the 35,000 to 40,000ft range, it really is hardly ever necessary to go to 45,000ft.

The Lear is certified up to 51,000 feet, though there is no point in going that high other than a) really favorable winds, or b) just saying you have been to 51,000 feet. It will take full power and a slow climb to get you that high, but it's perfectly possible, and the Lear can do it at gross weight. I love that bird.

1) KIAS should be steady decreasing the higher you go , Mach number shouldn't

Sorry Nexus, I have to correct you there.  The KIAS is the INDICATED airspeed and therefore will stay the same no matter what altitude you are.  The ground speed will increase, and the true air speed will vary depending on wind, but the indicated airspeed will stay around the same.

Eskimo...

You are right to a unless you use the Mach speed setting when using auto throttle then your KIAS will decrease with altitude even though the mach number remains constant.

The lear as well as most all of the jets have this feature in FS9.

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Sorry Nexus, I have to correct you there.