2-stage rotation versus initial climb attitude for takeoff

[PapaBravo]

Hi there,

1) Can someone explain the preferred use of one of the above methods over the other when flying a particular aircraft and
2) The proper technique for using the two stage rotation method in a typical commercial aircraft (e. g. Dash 8)

Thanks

J.C. (MYNN)

[ecj]

Might this be to avoid a tail scrape?

[northwing]

To avoid a tailscrape, or to keep clear of stall warning before sufficient acceleration has taken place.

[747FOCAL]

I bet in that A340-600 it is more like a ten stage rotation to a climb that only happens because the earth is round. :E

[Crossunder]

What 2-stage rotation? On the Dash-8-300 we rotate once. The aircraft is certificated to do a single rotation. About 3deg/sec as a guideline. Or might you be referring to the flare upon landing as the second stage? ;-)

[fatboy slim]

747 - You have duff gen on the A346 - its got huge amounts of power. The A340-300 series is underpowered which has been rectified in spades on the 600 model.

[747FOCAL]

fatboy slim, I know. I was just playin as indicated by the smiley. :)

[doubleu-anker]

The DC8-73 has a 2 stage rotation if memory serves me correctly.

One of the reasons the UK CAA weren't happy about having the type on the UK register?

[MasterBates]

There is actually nothing that says 2 stage rotations must be done with any aircraft. This is more or less an old habit, but it´s generally understood today that 2-3°/sec cont. rotation gets us airborne safely, no tailscraping, and of course the a/c needs to be rotated at the right airspeed. When weight is underestimated (American passengers :p ) a pilot might hesitate a little because the aircraft needs these extra knots to fly.
But, in general it is an understanding today that we only use one continous rotation.