Leon Davis DA-11

[First time Juke]

This needs a thread of his own.

http://www.aircraft-spruce.com/da11.html

32 sqft wingarea.

MPG is 107+...incredible !

170+ lbs empty.

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There are really lite planes like here...100 lbs, http://solar-flight.com/edelweiss/index.html

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Is the foil for DA-11 ideal ?

[bflynt]

Re: Leon Davis DA-11

Is the airfoil ideal for what?
An airfoil has numerous properties associated with it (i.e. Lift, Drag, Pitching Moment, etc.). These all change with the flow conditions surrounding the wing. Typically to design an ideal airfoil for one specific condition you are giving up performance in all other regimes.

In addition, an aircraft needs the wing to provide a given amount of lift and pitching moment to remain in the air. Therefore, the airfoil selection is automatically limited to shapes that provide the correct combination of the two while minimizing drag.

So as you see there is no one ideal airfoil and many would argue there is no such thing as an ideal airfoil at all.

Bryan

[First time Juke]

Re: Leon Davis DA-11

Is the airfoil ideal for what?
An airfoil has numerous properties associated with it (i.e. Lift, Drag, Pitching Moment, etc.). These all change with the flow conditions surrounding the wing. Typically to design an ideal airfoil for one specific condition you are giving up performance in all other regimes.

In addition, an aircraft needs the wing to provide a given amount of lift and pitching moment to remain in the air. Therefore, the airfoil selection is automatically limited to shapes that provide the correct combination of the two while minimizing drag.

So as you see there is no one ideal airfoil and many would argue there is no such thing as an ideal airfoil at all.

Bryan

Hello Bryan,

As you seen I am not aerodynamist by profession, but I do know something about foils.

I meant is it ideal for getting best mileage...and how much
better could it be in that respect ?

I know very laminar foils are very very sensitive for water and stains etc on their surface.

Foil affects also the structure and lightness...so foil is a compromise everytime isn't it ?

Lars Giertz V-max Probe had 24 sqft ( exposed ) wing area here in DA-11 there is 32 ( V-max 29 sqft ). How would tapering affect...more difficult to build I assume ? Could tapering allow smaller wing to be effective in this kinda design ?

Thanks for the input Bryan.


rgds,

Juke