the "its not needed" or "only real billy big bollox need to do that" responses!

Paul G said:

The winglets are not doing much but they are doing something, rider feedback is saying they dont notice anything but the engineers must see something in the data (or its a ruse!). The tricky bit is that its part of a dynamic system, so where and how the forces are created is a good question. If you think of the foils as device to create low pressure areas, with the bike being sucked towards the low pressure side it gets less murky. These stego fins appear to cancel each other out except if you think about it as they move horizontal over 45 degrees there is more downwards force than lifting force. The top fin creates a sideways force whos energy may be absorbed by the suspension, tire and TC so the net effect is more downforce from the horizontal fin, as VB says the rider is creating a disturbed airflow, how and where its reattached is windtunnel material. Notice that the GP22 has a narrow tail section compared to a Pani, but the Pani's tail is vented which btw is not just for looks.

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Paul G said:

My theory is less disturbed air, so less drag. The Pani tail is wide, so apart from a styling aesthetic, its help to lessen the low pressure area that forms behind the tail section.

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Andy7 said:

Likely wrong but I thought they were to create turbulence and upset the aero of bike in the slipstream behind.

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