Max Climb & Turn

[SportPilot]

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[SportPilot]

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[BrianL99]

As long as the ball is centered you are coordinated you won't stall.

No, that's not right. As long as the ball is centered, you are coordinated; you won't spin. Certainly you can stall. You stall every time you land properly (hopefully, with the ball centered). And you practice stalls all the time, with the ball centered!

As long as the ball is centered both lift and turn are stable. In pattern turns, ball center is even more critical considering how slow and low the plane has to be...

On climb=out ascent or base to final turn decent if the ball is not centered the high wing may stall before the lower wing at speeds above stall speed, for example.

As a rule of thumb, having the ball centered eliminates the above surprise, and leaves just the task of making sure to keep the speed above stall speed. In other words, cllimb-out at Vy and not Vx.

Here is an article on uncoordinated stalls: http://apstraining.com/blog/2009/10/12/ ... rn-stalls/

Any one who gets in an airplane you're flying, needs to have his head examined.

[BrianL99]

My best angle of climb is 60 kts. So if I climb at 60 kts while executing a 30 degree bank turn with the ball centered am I safe in avoiding a stall?

There is one fairly common situation where maintaining a given angle of attack requires flying at airspeeds above the V-numbers given in the Pilot’s Operating Handbook.

In a steep turn, the wings are required to produce enough lift not only to support the airplane’s laboratory-frame weight, but also to shove it around the corner. In a 60 degree bank, the lift requirement is doubled. We say there is a load factor of 2.0. The airspeed necessary to produce this lift at a given angle of attack is increased by a factor of √2, which is 1.41.

If you are going to use the airspeed indicator as a source of angle of attack information, you have to take this into account. If you fly at a speed near the bottom of the green arc in a steep turn, the airplane will stall. For example, if the airplane stalls at 60 knots in unaccelerated flight, it will stall at 85 knots in a 60 degree banked turn (since 60 × 1.41 = 85).

Also remember that the airplane is trimmed for a definite angle of attack, and it really wants to maintain that angle of attack. If you are cruising along, trimmed for 120 knots in straight and level flight, and the airplane gets into a 60 degree bank, it will accelerate to 169 knots (120 times the square root of 2) in order to meet the increased lift requirement at the same angle of attack.

http://www.av8n.com/how/htm/aoa.html

[MrMorden]

Keeping the ball centered is important, but the plane will still stall if you get too slow (too high angle of attack). The difference is both wings will stall and you may not enter a spin before you hit the ground and die.

But the important difference is that a coordinated stall is much easier to correct, even at base-to-final altitudes. Lower the nose and add power...in a lightly wing-loaded LSA, altitude loss should be minimal if one is timely with control inputs.

[SportPilot]

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[MrMorden]

This was a response to CTLSi mistakenly saying a plane won't stall if you keep the ball centered. Of course, a stall on short final would be easier to recover than a spin. It goes without saying.

Ah, I missed that he said that. Such rubbish I guess my brain didn't process it.