Simon Brooke said:in message <[email hidden]>, Don Whybrow
(') said:Simon Brooke said:What on Earth was Chris Hoy wearing on his head this weekend, and can it
possibly be UCI-legal?
Supplementary question: if it is legal, where does one get one?
For those of us that did not see it, any links?
I tried, but didn't find any - however Phil Cook correctly identified it,
here: http://www.dotbike.com/ProductsP1646.aspx?Track=FGL
It doesn't look like a bike helmet, it looks much more like a skull cap. I
don't suppose it's any better in a crash than any other helmet - except
less likely to cause rotational injuries - but at least he didn't look
like a total dork wearing it.
Whoever wrote that press release doesn't know as much as they think they
know about aerodynamics.
My knowledge isn't perfect (doesn't smeone here have the Navier Stokes
eqn in there sig?) but what I think they're trying to claim is:
The helmet doesnt have the classic teardrop shape (which is used to
prevent flow separation) because the dimples cause turbulence in the
boundary layer, which prevents the adverse velocity profiles that cause
flow separtion and hence form drag.
They talk about "> Breaking surface air tension and prevent it from
clinging on and down the riders back.
Apart from the nonsense about surface air tension, don't you actually
*want* the flow to remain attatched down the rider's back?
Ho Hum
Yeaterday I came across a picture of myself riding in a TT wearing a
lycra hat (like a swimming hat) that I thought would save me a handful
of seconds. It made me look like a complete wazzock. It wan't even on
straight.
Roger Thorpe