this hurts my head

[smokeyj]

I like the aerobelt idea. Folks remember you saw it here first.

[aerohead]

Originally Posted by tasdrouille

To me, if the dimples were to work on such an helmet (can't say they do or don't without WT testing), Louis Garneau placed them probably in the worst possible place. You'd want the dimples where the flow is transitioning.

I'm going to agree on the positioning.
For turbulent boundary layer,which I believe is the premise of the dimples,only a small area,right at the forward stagnation point would be the proper location.
In the 'FLOW-IMAGES' photos there is an image of a submerged bowling ball in the US NAVY hydro lab in Pasadena,California.You will see that only a very small area has sand adhered to the leading 'edge',adequate to force the transition to higher Reynolds number.

[Bicycle Bob]

Surface treatments do not affect the Reynold's number.
Helmet aerodynamics is a well-studied specialty, funded for the Olympics, and the design using a boundary-layer turbulator near the maximum diameter, with laminar flow from there forward to the stagnation point is a well-known classic design to deal with length limitations.

[Thymeclock]

This is marketing crap. If the protection is as sketchy as the prose, Darwin awards may be in order.

Agreed. To quote the old saw: "A fool and his money are soon parted."

[MetroMPG]

majestic: love the aero belt animation

And while we're on the topic of aeromodding helmets, in case anyone missed it here's another thread FYI: http://ecomodder.com/forum/showthrea...ors-12365.html

[Lazarus]

Originally Posted by smokeyj

I like the aerobelt idea. Folks remember you saw it here first.

I don't think that the areobelt would pass UCI muster. They are pretty specific about what can and cannot do. Here's a link for the requirements of the different bikes.

[aerohead]

Originally Posted by Bicycle Bob

Surface treatments do not affect the Reynold's number.
Helmet aerodynamics is a well-studied specialty, funded for the Olympics, and the design using a boundary-layer turbulator near the maximum diameter, with laminar flow from there forward to the stagnation point is a well-known classic design to deal with length limitations.

Bob,you are correct.
I should have said that the roughening would allow the transition to turbulent boundary layer at the lower Reynolds number.
As would a wire trip-strip,as demonstrated by Prandtl.