Quote:
Originally Posted by aerohead
*Convertibles have recorded Cds on the order of 0.85 with the top down.
*The MG TD is Cd 0.75 with the top up.
*The Lotus Super 7 is Cd 0.67.
*I've no specific data for your car.
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The nose of the car can constitute less than 6% of the overall drag of a vehicle.
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*All the 'action' is from the windshield to the rear.
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*The windshield of the MG,without any significant edge radii is capable of triggering flow separation with 'over-shoot' significant enough that the flow will never re-attach,top or sides.
*Dr.Walter Lay of the University of Michigan proved it in 1933.
*Dr.Wunibald I.Kamm verified Lay's results later in the 1930s.
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aerohead; I can add to that, In the SCCA Mazda Miata pro series cars they race with a hardtop on, better aerodynamics than with the top down. Same will happen with this MG Midget. Whether to OP wants to believe this data is all up to him. But this has been proven in the wind tunnel.