In a nutshel:
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Set v-speeds and use the appropriate speed based on weight. Flaps 2 is default for takeoff, and these vspeeds are based on Flaps 2. Click the link below for the vspeeds:
Not AAU1: Cessna Citation Longitude Flight Dynamics Modification Project - #1779 by DiBarkis -
Make sure your speed selector is on “MAN” (manual), not “FMS”, and dial the speed to at least the Vfto (185kts) or more depending on how sharply you’re gonna be turning right after takeoff. 200-210kts would be generally OK depending on speed restrictions on the SID.
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Advance your thrust levers to around 50%, not 50kts, then arm autothrottle (IRL you’d arm it before, and then on the runway, advance to around 50% and AT would auto-engage, but in-sim it engages immediately when you arm it, therefore advance to 50% before arming).
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Rotate at Vr, autopilot at 1000, and you can engage FLC immediately. The aircraft climbs like a rocket, and this is accurate in real life so don’t worry, that’s normal.
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Increase speed to 250, maintain this till above 10,000, then increase to 270 and maintain this until you intercept Mach 0.78 or so, or until FL300, then switch to mach and continue climbing to FL410 or even all the way to the flight ceiling of FL450 (I usually fly at FL450 if I can). Initially you’ll notice that you’re climbing at ~4,500 fpm. This will gradually decrease towards the higher altitudes all the way down to less than 1,000 fpm. This is normal both in-sim and IRL.
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When you reach your desired altitude, say FL450, increase your speed to Mach 0.84 or as close to it as you can/want.
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from takeoff to FL450 should take you approximately 23 mins.
You can also watch this video and see me doing it:
