September 30, 2014 Login  


these newfangled aero helmets...
Last Post 04/22/2014 04:16 PM by Keith Jackson. 95 Replies.
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Orange Crush

Posts:1189

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03/31/2014 12:29 PM
Well I would tell you that despite what you might think of RBA testing it is likely to be closer to real world than a lot of stuff being done for marketing purposes.

Also when you extrapolate to get to 10W, you are using a 40k TT as a basis. But the purpose of the Evade is for road racing. Longer distance and lower speed will make the wattage gain smaller. wattage gain ~v^2, remember?

So I am still skeptical of the 10W as being high. But that's just me.
Ride On

Posts:435

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03/31/2014 01:06 PM
Yes the 10W is full on your own riding into the wind. Any other type of riding will result in lower/different numbers. Even if you are on the front towing another ride stuck to your wheel will result in lower/different values.

Also as stated before the side to side motion of rider and frame will jack with these claims.

I can't imaginge how hard that is to measure widn drag to a 3 place decimal ( .005 ).
Ride On

Posts:435

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03/31/2014 01:09 PM
CK I'm surprised you haven't even touched on the sun glasses vs visor debate.
Cosmic Kid

Posts:1112

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03/31/2014 01:33 PM
Well, the "purpose" of the Evade is road racing / tris and even some TT's....it is a multi-use helmet. A "Jack of all Trades", if you will.

Clarification - I am not using 40K to get to 10w, I am extrapolating from 10w to get to the time savings in a 40K TT. The math from the CdA gets me the 10w.

And as I pointed out, the gains of an aero road helmet in a RR, while reduced due to racing tactics, are still very much present the WHOLE race. You are conserving energy every step of the way.....or pedal stroke.
Just say "NO!" to WCP!!!!
Orange Crush

Posts:1189

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03/31/2014 01:49 PM
Posted By Cosmic Kid on 03/31/2014 01:33 PM
Clarification - I am not using 40K to get to 10w, I am extrapolating from 10w to get to the time savings in a 40K TT. The math from the CdA gets me the 10w.


The math from the CdA involves an assumed velocity - there is no other way to get to the watts gained. So my argument stands. What is the velocity assumed? And Ride On makes a good point. If one repeats the experiment 10-30 times, what is the standard deviation on the CdA? It it in the first, second or third decimal? Lots of questions on these tests that remain to be answered. Would be fun to be part of the testing crew to determine what can and cannot be measured.
Cosmic Kid

Posts:1112

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03/31/2014 02:22 PM
IIRC, the velocity is based on 40kph.

re: Visor or no visor - no clear answer here, although it seems to lean towards "no visor", which seems counter-intuitive. For shorter events, I prefer the visor on my Selector, mostly because I have a better field of vision. For my Half-Ironman, I opted for a Rudy Wingspan helmet w/ glasses (which ironically may have been a slower helmet choice....was big on my head). For my IM this year, I am planning on a two-prong attack:

* Option 1: Vintage Bell Vortex w/ glasses.
* Option 2: If the Bell gets shut down by officials who think it is illegal (it's not), I'll go with my Selector, no visor and glasses.

The problem I have is that my fit on the Selector is VERY tight and presses on my ears. Dunno if I can do 5+ hours with it. I may have to ditch the ear flaps...we'll see. The question is then what that does to the aerodynamics of the lid.

My bigger issue is re: running. I have been running in compression socks this year because of all my injuries. Seems to be helping.....so do I do the whole race in them or try and wrestle them on in T2? Some say they are an aerodynamic plus, others say it is a negative. very individual.

Can't believe I am considering it, but there is an Aero Camp being put on my some guys from ST. I can get 2 hours of wind tunnel time for less than market price in June. It would allow me to make some better educated equipment selections.....but it is still gonna be pricey. Hoping to do some field testing first.....
Just say "NO!" to WCP!!!!
Keith Richards

Posts:737

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03/31/2014 02:44 PM
Posted By Cosmic Kid on 03/31/2014 02:22 PM
Can't believe I am considering it, but there is an Aero Camp being put on my some guys from ST.


Oh...we can TOTALLY believe it. lol!
----- It is his word versus ours. We like our word. We like where we stand and we like our credibility."--Lance Armstrong.
Ride On

Posts:435

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04/03/2014 05:28 PM
CK. I just picked up an LG Course on sale ( last years model ).

I expect +2mph on my next ride.
Cosmic Kid

Posts:1112

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04/03/2014 06:18 PM
Supposed to be a great lid....let us know how it is!!
Just say "NO!" to WCP!!!!
Cosmic Kid

Posts:1112

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04/03/2014 06:19 PM
Oh, but I think last year's model was only worth 1.25mph.
Just say "NO!" to WCP!!!!
Orange Crush

Posts:1189

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04/03/2014 06:22 PM
You're riding with an LG beer fridge on your head? I'd expect -2MPH.
jacques_anquetil

Posts:218

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04/04/2014 09:03 AM
please. can we just stay on the topic at hand and one on which we can all agree: these newfangled aero helmets are stupid ugly.
Cosmic Kid

Posts:1112

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04/04/2014 12:46 PM
The LG Course isn't....looks like normal lid, except for the rounded back.



And the Evade, in some of the color schemes isn't too bad.....god awful in black, though.
Just say "NO!" to WCP!!!!
Ride On

Posts:435

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04/19/2014 08:20 PM
Lots and lots of photos for you CK to get your aero wiener all excited.

http://www.cyclingnews.com/features/shoes-and-helmets-of-the-cobbled-classics

SideBySide

Posts:173

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04/19/2014 09:31 PM
That's a nice looking helmet.
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