Takeoff at heavy weight

[Altcrznav]

Airbus example ahead.

If I have a choice between Flaps 2 and lower V speeds or Flaps 1 and higher V speeds to lift a heavy weight, which one would be the preferred configuration?

Assume a 10000' runway and no obstacles.

[B2N2]

No obstacles so consider a NADP2 for a higher climb speed and a quicker transition to clean configuration.

[FlightDetent]

The optimum configuration from FOVE / LPC NG / FlySmart w/Airbus is the one giving the highest P(lim)TOW. That's how it works on the inside.

Normally this is observed by the highest flex temperature, a standard A320 (27.5k) will indeed FLEX at MTOW for the given conditions.

Unable to run the calcs now, but with zero obstacles it is always 1 unless < 2400m or so.

[FlyingStone]

If there are no obstacles, and assuming you are not field limited, the lowest flap setting will be the best. Least amount of drag, and the best performance during initial climbout.

[sonicbum]

Originally Posted by Altcrznav

Airbus example ahead.

If I have a choice between Flaps 2 and lower V speeds or Flaps 1 and higher V speeds to lift a heavy weight, which one would be the preferred configuration?

Assume a 10000' runway and no obstacles.

If both provide the same RTOW and Flex, go for 2 (higher flaps setting).

Ref. FCOM-PER-TOF Considerations

[FlightDetent]

DU not found?

But this exists: PER-TOF-THR-FLX-40 Takeoff Procedure, saying the same thing.

[oceancrosser]

That is a good reference chart for any airplane, just use relevant flap settings and whatever reduced thrust is called on your type.