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#3334179 - 07/04/11 12:36 AM Camber of the wing  
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Uriah Offline
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I have in my head that one of the late German WWI fighter planes changed the camber of the wing (increased it) and increased grater lift. Does anyone know about this? My real search is on what makes one camber better than another. I am thinking that the speed of the plane is the thing. The faster a plane is going the smaller the camber but you still need the same lift area and so a wider wing. I have the clue that in the 1903 Wright Flyer the brothers had to decrease the camber from what the writings of Lilienthal suggested. That makes no sense.


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#3334503 - 07/04/11 02:21 PM Re: Camber of the wing [Re: Uriah]  
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After much searching I found the answer about the shape of airfoils, very different than what I expected. It seems there is no one right shape.
see:
http://adg.stanford.edu/aa241/airfoils/airfoilhistory.html


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#3334554 - 07/04/11 03:39 PM Re: Camber of the wing [Re: Uriah]  
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Depends on your requirements for the wing, and as always in airplane design it is an excercise in juggling compromises. Whenever you get something in one department you have to give up something in another.


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#3334567 - 07/04/11 03:53 PM Re: Camber of the wing [Re: Uriah]  
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It all depends on what you need the airplane to do when you design it. Drag, Lift, and Thrust are what comes into play while designing a plane. Thust/power can and will overcome the other two, the F104 Starfighter proved this is the late50 early 60's


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#3334667 - 07/04/11 06:09 PM Re: Camber of the wing [Re: Uriah]  
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ft Offline
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There's at least one plane in RoF currently where variable camber is implemented. The Breguet.

Yup. Changing camber is essentially what flaps are all about. More camber = more lift at a given airspeed = lower stall speed & tighter turns, but also more drag and a slower aircraft.

#3334765 - 07/04/11 09:09 PM Re: Camber of the wing [Re: Uriah]  
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It seems there is a trick with flaps. You can get for more area above the wing that has less pressure than below but you also increase the area of the air hitting the wing depending on the angle of attack. If you nose down the air craft for a bit you can still get the proper angle of attack but have a greater lift area by the flaps. But if you nose up you increase the angle and may cause the lift area to dissipate due to increased turbulence over the wing (stall). The point? The use of flaps is different in take off verses landing. And the way you fly around, if you combine flap use with rising or lowering the nose of aircraft will bring about some interesting flying skills. Um, no flaps in WWI fighter planes.


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#3335525 - 07/05/11 08:42 PM Re: Camber of the wing [Re: Uriah]  
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Nothing interesting about using flaps. More interesting when you have to do without them when you are used to them...

A quick trip to Google tells me the R.A.F. S.E.4a had flaperons, i e flaps which were also used as ailerons, and that it was put into limited operational use for Home Defence purposes.

#3335559 - 07/05/11 09:39 PM Re: Camber of the wing [Re: Uriah]  
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Originally Posted By: Uriah
It seems there is a trick with flaps. You can get for more area above the wing that has less pressure than below but you also increase the area of the air hitting the wing depending on the angle of attack. If you nose down the air craft for a bit you can still get the proper angle of attack but have a greater lift area by the flaps. But if you nose up you increase the angle and may cause the lift area to dissipate due to increased turbulence over the wing (stall).

>snip<


Way to alleviate some of this is to wash out the tips ... the wintips will be less likely to stall when landing and still generate some lift as the AOA increases.

Sorta like wing warping.

#3335950 - 07/06/11 02:12 PM Re: Camber of the wing [Re: Uriah]  
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Uriah Offline
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'wash out the tips'? I have no clue what that is. Please enlighten me.


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#3336074 - 07/06/11 06:03 PM Re: Camber of the wing [Re: Uriah]  
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The AOA at the tips is less than inboard so that as the nose rises in preparation to flare out on landing the tips do not stall but still maintain some lift.


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