the two main wings are for downforce, meanwhile the third is to prevent air "porpoising" or making unstable back-and-forth movement/turbulance. edit: I AM NO PROFESSIONALL!!!! aerodynamic advice is 100% accepted, this is just a concept :)
flaps
slats
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you can achieve the third airfoil effect if you make a tailtip on the wing that slowly smoothens out to align with the angle of attack
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"box box box, stay out, stay out"
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actually pretty cool