In Reply To:
In Reply To:
I'd like to hear you and Gerard debate this topic (or the engineers from your respective companies). Not saying you are wrong or he is wrong. And I don't own a Cervelo or a Felt. But he has posted before about things like the integrated fork area on the TTX or front wheels cutouts as being ineffective. Maybe you guys figured it out, I don't know.
Rear wheel cutouts are also uneffective and I never saw Gerard complain about that.
There's a big difference between a front wheel cutout and a rear wheel cutout. The front wheel turns sideways, making it much harder to optimize the airflow in all situations. We were probably the first company to have a bike with a front wheel cutout in the windtunnel (the Baracchi has the biggest front wheel cutout you can make), and the demands on the shape of the downtube are very, very tough. It can certainly be done, but I haven't seen anybody come close. It is sort of like fork blade spacing. Either you put the blades very far away from the wheel, or very close, but somewhere in the middle is usually quite bad aerodynamically. Same with a front cutout. Either you put it very close and really design the shape to pick up the airflow correctly in all common steering angles (which would be a shape nowhere near a traditional airfoil shape) , or you keep the downtube quite far away from it (which would be a normal, straight downtube with normal airfoil shape) so it can reattach the airflow. Anywhere in-between spells disaster (well, in the limited sense of not so good aerodynamics, in the grand scheme of things people will live).
Gerard Vroomen
3T.bike OPEN cycle