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Design question on wetted area drag vs. interference drag !

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topspeed100

Well-Known Member
Joined
May 4, 2009
Messages
4,063
Location
Oulu/Finland
I am trying to optimize a design and I have few options.

Would it be more efficient to increase wetted area than create a new component which would create more or less perpendicular aerodynamic shape into the slipstream ?
Wetted area increase would create same stabilising effect than this component would.
Is there a rule of thumb to solve this...how much more can I have wetted area vs. new control surface area ? This is not related to pitch moment in this case.

Does this apply..it is closely related to the air speed ?

http://en.wikipedia.org/wiki/Parasitic_drag
 
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