Calculating Drag Increase with Airbrake: Semi Span

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Pulp
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I need to calculate the increase in drag due to an airbrake, however the formula includes "semi span". I'm unsure if this is simply wing span/2 or is it the length of a wing in which case it would be (wing span - fuse width)/2. Any help would be good.
 
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Semi span is half the wing span.
 

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