Yes, this is similar to a bicycle Cd with the same back angle for the rider. The rider's chest acts as a pump vane. The case of Sendler riding his CBR 250 in a racing tuck with some help from the cargo bags is the first step in drag reduction. The flow behind the rider is critcal as the SR article mentioned. Can you imagine a 50cc scooter with bicycle aero bars and a Yamaha Rifle style fairing slipping through local traffic? Rider protection and 300 mpg easy.
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