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Ducting looks good with a NACA scoop inlet. I like thin aluminum sheet bonded to gasket paper for insulated ducts. Check out the shape of Fred Hayes' diesel bike, it looks like a commercial unit. I use 4mm coroplast and large nylon tubing for ribs. Hex steel mesh bonded between tarp weight sheet plastic is more flexible. Consider the Morelli/ Aptera shape profile; the radius at the edges should at least 10% of the width i.e. 2.5 - 3"
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