Re: [Flightgear-flightmodel] What happens during rotation at takeoff?

[Erik H. <er...@eh...>]

On 11/09/2017 04:45 AM, Ivan Soleimanipour wrote:
> Hi,
> 
> I'm developing my own simulator so this is a generic simulation question 
> I'm hoping
> the collective experience here can shed some light on.
> 
> It seems so simple. You pull on the stick, rotate and you take off.
> 
> If you analyze the situation in the craft frame with origin for moments
> at the rear wheels it's straighforward. The elevator pushes down and that
> rotates the craft around the wheels and the CG rises.

I think you will need to analyze it as if the aircraft is already 
flying. The aircraft rotates around it's aerodynamic reference point 
(around 25% wingspan) when you pull the yoke (or stick). The only 
difference is that the movement is restricted by the landing gear which 
will generate a counter rotational force.

Erik

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