pieces under the wings

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They're called flaps. Controlled by the pilot to enable the aircraft to fly slower by increasing the lift the wing is able to produce. They also increase drag, so are generally only used for approach and landing.
 
Thank you. I remember seeing similar parts on another plane, (I don't remember the name of that plane), but they had holes in them.
 
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Here a couple of examples ...

The Northrop BT ...

the dive flaps at the neutral position ...


the bottom part of the diving flps lowered down working as the landing flaps ..


both the top and down parts of the diving flaps at the position working as the air brake ...


The Curtiss SBC Helldiver ...

the bottom part lowered down as the landing flaps ...


the top and bottom parts fully opened working as the air brake ...


The Douglas SBD Dauntless ...

the neutral position ...


and the bottom parts lowered down as the landing flaps ...



and a diving SBD with fully opened diving flaps working as the air brake

the pic surce : the internet.
 
Great pictures, Wurger! Thanks.
 
Capt. Vick said:
Just a correction, the Grumman TBF did not have dive flaps, flaps with holes in them.
Click to expand...
I guess I should have worded that better, the TBF had "brakes" that steadied it during a torpedo run or a bombing run from a shallow dive. This was accomplished by their flaps extending to the full 40° position.
It's when the flaps are in this position (fully extended), you can see the holes in the lower flaps.
 
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