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New Aero Hub design from Novatec

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Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

New Aero Hub design from Novatec

Old 08-08-09, 08:57 PM
  #1  
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New Aero Hub design from Novatec

We're having the worst typhoon here in 50 years so I've had a few extra hours to finally pour over some tech info and press releases that were clogging up my inbox.

Here's one I found interesting. From the press release:

"The combination of a new foaming technique with a special process procedure made the creation of this innovate hub possible.

The idea in the patented unique oval design is based on the thought of realizing the most aerodynamic shape to minimize side wind drag and turbulence, occurring around the hub flanges.

Equipped with the patented Novatec UNIQUE 3-in-1 cassette body, CRAFT allows riders to change the cassette systems in between Shimano, SRAM and Campagnolo.

CRAFT - modern streamline hubs, 99mm 3D high profile carbon rims, bladed aero carbon spokes and the Novatec UNIQUE 3-in-1 cassette system result in a highly rigid, aerodynamic and user-optimized wheelset, which can be equaled by no other.

Novatec will first time present this special wheels to public during Eurobike 2009.

Expected date to release Craft to market is the year 2010."



No wind tunnel data but I am indeed curious.


Discuss.
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Old 08-08-09, 09:16 PM
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Foaming hubs! Radical!

Seriously though, super space age! Do those roll on steel bearings or an electroplasma-powered magnetic field?!
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Old 08-08-09, 10:47 PM
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Originally Posted by Eggywootah View Post
Foaming hubs! Radical!

Seriously though, super space age! Do those roll on steel bearings or an electroplasma-powered magnetic field?!
I think the anti-gravity feature is being developed for 2011.
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Old 08-09-09, 12:37 AM
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plump.
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Old 08-09-09, 01:03 AM
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Originally Posted by Soil_Sampler View Post
plump.
It kind of reminds me of a jet engine.

It makes sense to me but I'd love to see some wind tunnel data. Intuitively I'd say it would be most effective in cross winds but who knows.

I should be able to see one in person in a month of so. Novatec may even have data by then to share.
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Old 08-09-09, 01:10 AM
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These are really, really cool. I would also love to see wind testing data.

Mr Dopolina - I'm in South Korea and I think we're getting the edge of that typhoon here today. Went to the beach this morning only to see crazy huge waves. Should be a good night to stay in.
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Old 08-09-09, 01:19 AM
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Originally Posted by Fugazi Dave View Post
These are really, really cool. I would also love to see wind testing data.

Mr Dopolina - I'm in South Korea and I think we're getting the edge of that typhoon here today. Went to the beach this morning only to see crazy huge waves. Should be a good night to stay in.
Man, that thing stalled over Taiwan and devastated areas around us.

We have the worst flooding in 50 years.

An entire 8 story hotel and surrounding building was washed away when the river it was built next to tore down the levee, eroded the road underneath and then finally caused the hotel to topple.

Major bridges are gone, whole villages are underwater...

Over the next few weeks, as I ride through the countryside I'm sure I'll see major damage.

I hope it is much weakened by the time it gets to you.
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Old 08-09-09, 01:23 AM
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I can't imagine it will still have that much power if/when it actually makes its way over here. Best of luck to you and yours over there getting things back on track.
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Old 08-09-09, 05:12 AM
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Originally Posted by Bob Dopolina View Post
Intuitively I'd say it would be most effective in cross winds but who knows.
mate it with a little lower profile rim.
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Old 08-09-09, 05:13 AM
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If it actually works, it could save some decent wattage, especially in crosswinds. I was actually playing in my brain with a center hub shell that is airfoil shaped and indexed from the stationary hub caps/inner bearing race, so that it stays oriented. I decided that the added seal/bearing drag and weight would probably kill the aero savings. Maybe I should file?

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Old 08-09-09, 05:46 AM
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Originally Posted by jamiewilson3 View Post
If it actually works, it could save some decent wattage, especially in crosswinds.
Um, probably not. I guess it depends on what you call "some decent wattage," but once you put that aero-looking hub on a frame/fork with spokes around it, I'm guessing the hub's contribution to aerodynamics will be pretty negligible.

If aero hubs were important I'm confident that the geeks (and I mean that in the best way possible) at Zipp, HED, et al would've brought their aero hubs to market years ago.
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Old 08-09-09, 06:12 AM
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they're trying Doc.

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Old 08-09-09, 06:14 AM
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Originally Posted by Soil_Sampler View Post
they're trying Doc.

Yeah, but they don't really claim much at all in terms of power savings. Mainly a little bit of bling for the ZedTech wheels that I'm not sure they even claim any power savings for.

(edit) Correction--I found it on the Zipp website...

Originally Posted by Zipp
Zedtech hubs spend almost twice as long in the machining process, the dimple size is programmed to fit hub curvature and delivers 0.8 watts savings
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Old 08-09-09, 06:23 AM
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a watt here, a watt there, they all add up...
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Old 08-09-09, 06:28 AM
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Originally Posted by Soil_Sampler View Post
a watt here, a watt there, they all add up...
Actually, they don't. Watt savings in the wind tunnel are not additive.
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Old 08-09-09, 06:31 AM
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bummer.
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Old 08-09-09, 06:34 AM
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Originally Posted by Soil_Sampler View Post
bummer.
I know! It would be nice if they were. It would help justify the $1300 crankset that saves 9 seconds over 40K.

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Old 08-09-09, 06:40 AM
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not cumulative? glad I'm not making advanced jets!

no need to justify the cranks, as long as they make you feel faster!
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Old 08-09-09, 07:22 AM
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The hubs look heavy
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Old 08-09-09, 07:56 AM
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Originally Posted by Bob Dopolina View Post
It makes sense to me but I'd love to see some wind tunnel data. Intuitively I'd say it would be most effective in cross winds but who knows.
It doesn't make sense to me. Cylinders have crappy aero... large cylinders just create more drag. A yaw angle of <10 deg is typical, so these will look just like a big fat cylinder to the wind.

An "aero" hub would be a small diameter cylinder with lines clean as you can make.
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Old 08-09-09, 08:01 AM
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Originally Posted by Soil_Sampler View Post
not cumulative? glad I'm not making advanced jets!

no need to justify the cranks, as long as they make you feel faster!
There used to be a very good article on Cervelo's website about this, i.e. why the wheelset that saves 90 seconds and the frame that saves 30 seconds don't save a total of 120 seconds...

I've already bought my expensive cranks, and if used properly they'll cut a lot more than 9 seconds--via engine upgrades, i.e. a Quarq Cinqo.
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Old 08-09-09, 08:25 AM
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It is called the interactive effect. It is non-linear but still adds up.
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Old 08-09-09, 10:54 AM
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looks super euro
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Old 08-09-09, 12:05 PM
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Originally Posted by rruff View Post
It doesn't make sense to me. Cylinders have crappy aero... large cylinders just create more drag. A yaw angle of <10 deg is typical, so these will look just like a big fat cylinder to the wind.

An "aero" hub would be a small diameter cylinder with lines clean as you can make.
I disagree.

Aero means controlling air flow. If these work to control airflow in a manner that reduces drag, while attached to a bike, then they are more 'aero'.

Again, I await data.
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