Sorry for bump an old topic. What was the take off flap for the 300 for a 9 hour flight for example

Sorry for bump an old topic. What was the take off flap for the 300 for a 9 hour flight for example

 

Depends on weight, field length, de-rate, and so on.

Paul, as you know flap speed depends on weight.

The heavier you are the faster your manouvering speed for a given flap selection.

Slowing down from 250kts in an approach, reach the green "UP" speed bug in a clean configuration THEN, in order to slow down further, set your flaps to 1 and set speed down to your green flaps 1 bug.

When the speed is down to the green "1" bug, set flaps 5 and slow down to the green flaps 5 speed bug.

So, this is the concept.

The green speed bugs represent the manouvering speed for your weight, so you can consider that as your max speed for the given flap setting.

 

If you don't see the flaps 20/25 speed reference, is because you have not selected flaps 20 or 25.

From flaps 5 speed, if you set flaps 20, you must see your green flaps 20 speed bug, and then you slow down to that speed.

 

Hope this helped you

Surely that means they are the minimum speed for the flap setting, to achieve the required manoeuvre margin (safe up to 40 deg bank). They correspond to the reference speed for that flap angle (V_REF30 + xx knots).

I personally like high weight, high de-rate temp, and flap 5.  Nothing like the thrill of wondering if you will make it as you are careening down the runway and the end of it is ever approaching.   So far I have made it every time!