Spotted on a guy’s tiny P3C who raced in Louisville. He has friends at Zipp apparently. It is a tubular 808 style rim bonded to a new disk lay up.
I’ve got two other pictures if anyone is interested. I only had my cell phone camera with me. Sorry for the grainyness (not in spell check).
Richard Armstrong
Can you spell P O W E R T A P and D I S K? 
Can you spell W R O N G. It had a “standard” Zipp hub and a solid disk section between the hub and rim. It was not a Powertap hub/808 rim with a wheel cover.
Wait and see.
Richard Armstrong
Hmmm…so I guess Jens is right after all…
.
Hmmm…so I guess Jens is right after all…
.
Hmmm…so I guess Jens is right after all…
Yeah…but too bad it’s a tubular (hehe)…maybe they’ll “upgrade” the clincher shape?
That was my friend’s bike. He does know people at Zipp and was testing it for them. It is, bascially, an 808 filled in in the middle.
Now I don’t have all the details, but this wheel, at ~28-30mph and w/ the “right” wind angle is supposed to create propulsion. That is, at speed, the wind goes over it and doubles back behind it and actually pushes the wheel forward.
It’s lighter than the ‘old’ disc too.
I don’t want to give out his name, as he is an ST’er and probably doesn’t want be bombarded w/ PM’s, but he said it was sweet, but he was riding conservatively, to make sure he could finish.
That was my friend’s bike. He does know people at Zipp and was testing it for them. It is, bascially, an 808 filled in in the middle.
That’s what the speculation was that the reported “magic disc” would resemble…and is also what an 808 with a disc cover resembles, right Jens?
Now I don’t have all the details, but this wheel, at ~28-30mph and w/ the “right” wind angle is supposed to create propulsion. That is, at speed, the wind goes over it and doubles back behind it and actually pushes the wheel forward.
Well, not exactly. The wind wouldn’t “double back”, it basically is making lift (just like a wing)…it’s just that in this case, the component of the lift force in the direction of travel is greater than the component of the drag force in the direction of travel. Most aero wheels do this (make lift, that is - which is why you see drag numbers dropping with yaw angle in drag plots) just not to the same extent. I believe the number quoted in the Zipp wind tunnel article was a +80 grams at 30 mph and 12-15 deg of yaw. That works out to be an ~9W boost at typical race speeds…when the wind is at that high of a yaw angle, of course. You will by NO means be pushed down the course sailing away without pedaling…but you will get a little “boost”
I don’t want to give out his name, as he is an ST’er and probably doesn’t want be bombarded w/ PM’s, but he said it was sweet, but he was riding conservatively, to make sure he could finish.
MmmHmmm…your “friend”, you say…right…
I’m friends with the same guys at zipp as him but I didn’t get the wheel. haha. I wonder if the fact that I stink at biking has anything to do with it :).
Now I don’t have all the details, but this wheel, at ~28-30mph and w/ the “right” wind angle is supposed to create propulsion. That is, at speed, the wind goes over it and doubles back behind it and actually pushes the wheel forward.
Well, not exactly. The wind wouldn’t “double back”, it basically is making lift (just like a wing)…it’s just that in this case, the component of the lift force in the direction of travel is greater than the component of the drag force in the direction of travel. Most aero wheels do this (make lift, that is - which is why you see drag numbers dropping with yaw angle in drag plots) just not to the same extent. I believe the number quoted in the Zipp wind tunnel article was a +80 grams at 30 mph and 12-15 deg of yaw. That works out to be an ~9W boost at typical race speeds…when the wind is at that high of a yaw angle, of course. You will by NO means be pushed down the course sailing away without pedaling…but you will get a little “boost”
~Yeah, that’s what I meant to say.~ “yaw?” More like “yawn!”
I don’t want to give out his name, as he is an ST’er and probably doesn’t want be bombarded w/ PM’s, but he said it was sweet, but he was riding conservatively, to make sure he could finish.
MmmHmmm…your “friend”, you say…right… I assure you, this was a friend, not me. I am strickly a lurker, not even a triathlete.
Yeah…but too bad it’s a tubular (hehe)…maybe they’ll “upgrade” the clincher shape?
Isn’t the tubular catching up with the clincher? Isn’t the clincher the more advanced Zipp disc currently?
Yeah…but too bad it’s a tubular (hehe)…maybe they’ll “upgrade” the clincher shape?
Isn’t the tubular catching up with the clincher? Isn’t the clincher the more advanced Zipp disc currently?
The current clincher disc (if you can get one) only has a 404-sized bulge. This new tubular disc has a more 808-sized bulge.
Hey! If they keep going and extending the “bulge”, they’ll eventually end up with a lenticular disc!
Spotted on a guy’s tiny P3C who raced in Louisville. He has friends at Zipp apparently. It is a tubular 808 style rim bonded to a new disk lay up.
I’ve got two other pictures if anyone is interested. I only had my cell phone camera with me. Sorry for the grainyness (not in spell check).
Richard Armstrong
That to me does not look like something from Zipp. Zipp disks have a smooth flowing surface and are bonded as one piece. From the photo, it looks like something created in someone’s garage. Look how sloppy the joint is.
You need to post more photos.
Spotted on a guy’s tiny P3C who raced in Louisville. He has friends at Zipp apparently. It is a tubular 808 style rim bonded to a new disk lay up.
I’ve got two other pictures if anyone is interested. I only had my cell phone camera with me. Sorry for the grainyness (not in spell check).
Richard Armstrong
That to me does not look like something from Zipp. Zipp disks have a smooth flowing surface and are bonded as one piece. From the photo, it looks like something created in someone’s garage. Look how sloppy the joint is.
You need to post more photos.
Do you mean one like this?
Wow, where’d you find that pic
As a question to the aero techs amongst you;
Surely a wheel will be more aero if the taper between the thickest part of the rim (so at the bulge) extends to the center of the disc rather than just imitating the 808?
I guess that the sharp(ish) taper will cause the flow to go separated at a lower yaw than if it was tapered to the rim?
Is this just a manufacturing limitation?
And just to merge my other post;
http://www.pezcyclingnews.com/?pg=fullstory&id=5249
“And what’s silly is their new 202 climbing wheel has been given a makeover that has it testing better than some 50 deep section wheels”
Good good, something new to lust after!
The pic is from Pez Cycling news and is part of a VERY interesting article…I need a disc for next year and perhaps this one will be available in the Zed Tech line. Apparently it is call 'The Sub 9"
The article also mentions a new Zipp crankset called the “Vuma Quad” which is brand new. I saw a photo of it in the 2008 Cannondale catalog (On the Slice ultimate) and it LOOKS pretty sick…
Does this wheel have spokes inside, like a 808 with covers? Or are the carbon discs structural?
Is this the disc David Millar rode in the 2nd ITT at the Tour de France this year? I want that wheel.
I know. I just thought it funny with all the discussion of yaw and lift and dimples and whatnot, that the minor factor of whether or not the wheel actually stays intact for more than 100 yards seemed overlooked.
I’m surprised in the TdF with all the proto equipment being run that there aren’t more disasters like Millar’s. How great would it have been to see some of that electronic shifting short out up the Galibier and constantly shift the poor guy testing it into the big ring. Didn’t hear anything about the road tubeless tire one team (Cofidis?) was riding, guess it worked out ok for them.