Aerodynamics / Aerodynamic Cost / Aero parts

AeroCoach endorsed...

Exactly the kind of answer I wanted #buyer

Is the GUB just a cheaper version of the c-originals helmet? Did you get it off aliexpress and what was the delivery/service like?

Ironman tatts?

banned

Eugh no... it's one of those stupid stick on numbers they make you wear.

calls back the hounds

Must pack scissors for IM Wales, need to trim the stickers so it's just the numbers I put on.

Next question: is an aeroshell on a Lazer o2 helmet actually aero? It's only £15 so I suppose it probably won't make it any less aero...

worst comes to worst, it still looks pretty cool...

It'll cause your head to overheat and explode.

Flo has designed new wheels:
http://flocycling.blogspot.dk/2016/03/flo-cycling-wheel-design-series-step-1.html

This is interesting:

50 percent of your time on a bike is spent between zero and five degrees of yaw.

80% of bike time is at 0-10 wind angle according to them

I thought there would be more sidewind/higher angles, but they dont say at what speed so I guess that is the joker. But their chart is lower than other estimates, yes?

their chart is lower than other estimates, yes?

I don't think it's lower that other measurements. It suggests that the weighting of yaw angles should be more in favour of lower yaw than some wheel manufacturers would like you to think, mostly because it turns out that if you weight towards very low yaw then nobody needed to buy new wheels since Campag sold us Shamals in 1991 :-)

yes, zipp also went back to low yaw is important on their firestrike wheels.

It is also interesting that there is only 1 second between the 60mm and 90mm flo wheel.

Time Saving Estimates and Percent Improvement for Continental GP 4000 S II in 23mm Size

Not sure why anybody would want their full carbon disc - slower than the aluminium rim, and $300 extra for only 40g lighter.

Struggling to find a HED3 or Zipp 808FC for a pal.

What else is worth considering (clincher only), either as an alternative to the above or as a stopgap (so somewhat cheaper and easy to sell on)?

Isn't this basically what the head honcho at Reynolds has been telling us for a while? I remember reading an interesting article/interview on the area that could be summarised as "aero experts in other fields laugh at some shapes in the new wheels" "cervelo and giant with the new propel have it right by making thin frames still"

there's obviously more, but that's what I clearly remember

"aero experts in other fields laugh at some shapes in the new wheels"

If they are in other fields, they might not actually ride bikes. There's more to a good wheel than just minimum drag, otherwise we'd all use front discs :-) Most of the work in the past few years has not been focused on reducing drag at low yaw, it has been a move towards making a low drag wheel which can actually be used in cross wind conditions too.

Flo 90. Rolf Vector Pro, if you believe the hype.

haha true, I tried explaining the front disc thing to a triathlete once, and he downright refused to believe me, couldn't fathom that a front has more of a positive aero effect than the back #stupidslvlss

Could it lead to multiple types of aero wheel being created then? low wind and high wind ones? for example on a still day being teed up for a sprint, a sprinter would rather have a "low wind" more V shaped wheel than a "high wind" U shaped

The marketers and wheel companies would certainly jump on it

Rolf Vector Pro

Should be easy to sell on, given how hard it will be for @Scilly.Suffolk to find one to buy :-)

Could it lead to multiple types of aero wheel being created then?

Plenty of testers already have at least two different front wheels to cater for different conditions.

but they dont say at what speed

30mph mixed directions

Do you have a quote/link?

I found this from the designer on slowtwitch:

What kind of typical cruising speeds were you cycling at to get these results? 16, 18, 20mph?

We rode at a variety of speeds during our studies. Of course higher speeds produce lower yaw angles, but there wasn't a significant enough difference to worry about. What the overwhelming result was, no matter where we rode, is that yaw angles are typically much lower than we believed in the past. Our data shows that 50% of your time is spent between 0 and 5 degrees, and by the time you get to 10 degrees of yaw, you have accounted for 80%. You spend only 20% of your time between 10 and 20 degrees of yaw, and as the angles get higher, the percentage of time gets lower.

Long story short, what I've said above really holds true for the average speeds almost any athlete is maintaining.

http://forum.slowtwitch.com/cgi-bin/gforum.cgi?post=5876045#5876045

Yeah. I guess the C-original is just the finish imported version.

Delivery and service were great. I'll post the link tomorrow.

Cheers @Smallfurry. Did you find it in black and white? As much as I like the crazy colours, I'm quite boring at heart.

I have dark grey and yellow.

My club kit is unfortunatley green and yellow.

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Totally could have reflecto porned that.

#regrets