Speed during rotation increases too much?

[jgoggi 65]

Please PMDG, check if the lift off behaviour is correct, since it does not look to be 100%...

[PMDG777 231]

Just now, jgoggi said:

Please PMDG, check if the lift off behaviour is correct, since it does not look to be 100%...

You know this isn't an official support avenue. Submit a support ticket.

[kevinh 409]

2 hours ago, jgoggi said:

Please PMDG, check if the lift off behaviour is correct, since it does not look to be 100%...

Don't you think RSR would have noticed such a problem during development of this sim, with his 744 experience?

[berts 97]

5 hours ago, jgoggi said:

Please PMDG, check if the lift off behaviour is correct, since it does not look to be 100%...

Within the limits of any PC simulation, the rotation and initial climb performance of the PMDG 744 behave very much like the real aircraft and even the slight pitch hesitiation due to ground effect as the aircraft rotates before climbing away appear to have been modelled.

The correct liftoff technique for optimum performance is to initiate at VR a smooth and continuous rotation rate of 2 to 2.5 degs/sec to a target attitude of 12 to 13 degs nose up.  The liftoff will occur at a 10 deg NU body attitude and at normal gross weights the initial climb speed should be V2+10kts.  At light weights the airspeed will rise quite rapidly if you allow it to, so it will usually be necessary to adjust the pitch attitude to keep the airspeed below a max of V2+25kts during the initial climbout.  It always pays to look through the Flight Director when hand flying the 747 and to adjust the attitude to achieve the target climb speed you want for the flap configuration. Try a light weight takeoff with the Flight Director switched off if you really want to have some fun and hone your handling skills!

Bertie Goddard   

[HighBypass 2,339]

So, if the autothrottle is controlling the thrust setting, just modulate your pitch to prevent the overspeed, climb rate be damned! No matter if she's going up like a homesick angel :D... unless you bust the altitude for your given STAR or ATC instruction... 

Just fly her...