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I took a 737 rating written test yesterday and one of the questions was:

What's the optimum speed for takeoff flaps?

  1. V2
  2. V2 + 10
  3. V2 + 15
  4. V2 + 20

Anybody knows the answer? I did some research and couldn't find it.

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  • $\begingroup$ Optimum for what? Climb gradient, rate of climb, engine-out climb, schedule? $\endgroup$ – Sami Feb 11 '18 at 3:05
  • $\begingroup$ @Sami I have no idea. This was the exact wording of the question as far as I remember. $\endgroup$ – lemonincider Feb 11 '18 at 4:50
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    $\begingroup$ FWIW, the webpage at flaps2approach.com/journal/2014/8/4/… has the statement, "V2+15/20 is the optimum climb speed with takeoff flaps. It results in maximum altitude gain in the shortest distance from takeoff." $\endgroup$ – Terry Feb 11 '18 at 21:07
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I assume the question means optimum climb speed.

From the Boeing 737 NG FCTM (3.30 Takeoff and Initial Climb):

V2 + 20 is the optimum climb speed with takeoff flaps. It results in the maximum altitude gain in the shortest distance from takeoff. Acceleration to higher speeds reduces the altitude gain. If airspeed exceeds V2 + 20 during the initial climb, stop the acceleration but do not attempt to reduce airspeed to V2 + 20. Any speed between V2 + 15 and V2 + 25 knots results in approximately the same takeoff profile. Crosscheck indicated airspeed for proper initial climb speed.

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