Zipp's wheel claims: do you believe them?
10-04-07, 05:07 AM
#201
Peloton Shelter Dog
Have I posted
Zipps RULE
yet today?
Zipps RULE
yet today?
10-04-07, 05:43 AM
#202
5
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10-04-07, 10:35 AM
#204
Dude wheres my guads?
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Yeah the windmill has a surface area of how much again? And given the angle of incidence of wind onto your wheels, it would have to be in a very small range to contribute any real gain. In addition this is true of every disc out there, not just zipps.
10-04-07, 10:41 AM
#205
Peloton Shelter Dog
Question not the Gospel of Zipp.
10-04-07, 11:41 AM
#206
Senior Member
While it is true that all disks exhibit negative drag under some conditions (hold a disk wheel perpendicular to the wind and you'll feel it), most do not show it under typical riding conditions (the above example, for instance).
10-04-07, 12:04 PM
#207
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I believe it. Why not? I think in aviation they make advances like this all the time....a plane body design that will have a range of 5000 miles instead of 4500.....hell didn't adding those flip up wing tips add something or are they just for looks and make Southwest want to buy some new planes?
In the end they are just saying that you will get there X amount faster at the same power...
Doesn't seem to far fetched to me....I do agree marketing embellishes as I am sure they did but I believe it to be true to some extent...
In the end they are just saying that you will get there X amount faster at the same power...
Doesn't seem to far fetched to me....I do agree marketing embellishes as I am sure they did but I believe it to be true to some extent...
10-04-07, 12:15 PM
#209
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I have to add a comment here about your flip up wing tips. They are actually called winglets and serve a specific purpose on the aircraft. Due to the lift created by the airfoil and the difference in pressure on the upper and lower surfaces a rotational pressure field is generate, termed a wingtip vortice. The wingtip vortices decrease the effectiveness of the airfoil and increases the drag. The winglet prevents more like decreases the magnitude of these vortices and thus the effective lift of the airfoil is increased while the drag is decreased. Any small aircraft pilot knows that while landing or taking off after a large aircraft they must ensure that they do not fly into these vortices otherwise they will have a very unpleasant ride and it might very well be there last.
10-04-07, 03:18 PM
#210
Cat3.*....Cat2
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The thing that really makes me laugh at is the fact they claim the reduction in drag is measured in grams (mass) and not a unit of force.
10-04-07, 03:55 PM
#211
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10-04-07, 04:44 PM
#212
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Well that is 30 minutes of my life I will never get back
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Si vis pacem, para bellum
Si vis pacem, para bellum
10-04-07, 04:45 PM
#213
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drag is the force imposed on an object by a fluid opposite to the direction of travel.
thrust is providing force in the direction of travel
negative drag would be the fluid pushing on the object in the direction of travel therefore the object will be going on its own without the need of thrust.
btw air is a fluid.
thrust and drag are two different components acting on an object they can't be interchangeable. so one can't be the other
im done with this thread.
thrust is providing force in the direction of travel
negative drag would be the fluid pushing on the object in the direction of travel therefore the object will be going on its own without the need of thrust.
btw air is a fluid.
thrust and drag are two different components acting on an object they can't be interchangeable. so one can't be the other
im done with this thread.
10-04-07, 04:53 PM
#214
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10-04-07, 05:55 PM
#215
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wtf?
this was so boring i can't believe I just read this crap...
but it did raise one really important question...why do my wheels spin while they are on the bike rack in back of the car as I zoom along? {ps I really don't care but plz answer me anyhow}
this was so boring i can't believe I just read this crap...
but it did raise one really important question...why do my wheels spin while they are on the bike rack in back of the car as I zoom along? {ps I really don't care but plz answer me anyhow}
10-04-07, 06:00 PM
#216
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soooo having wasted half an hour reading this thread its safe to say that dimples are good and bad, produce drag and lift, will make you faster than a sailboat and that zipp are nothing more than drunken marketing people in toga's................BF, always a wealth of knowledge
10-04-07, 06:03 PM
#217
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+ 1 I wish I wouldn't have opted out of every science class I could just so I could understand this crap. Than again, I really only care about appearances anyway, and they look pretty cool - so I'll prolly get some some day.
10-04-07, 07:37 PM
#218
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because they are sails? or golf balls? Wait no im confused.
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Si vis pacem, para bellum
Si vis pacem, para bellum
10-05-07, 12:04 AM
#220
Je pose, donc je suis.
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10-05-07, 12:09 AM
#221
Je pose, donc je suis.
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Have you checked you rear quarter panel for dents or...wait for it...dimples?
10-05-07, 02:31 AM
#222
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Bike computers can be fun...
10-05-07, 01:20 PM
#224
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My Zipp 404 tubies are light. They are FAST. They help when my nose is in the wind @ 30mph. They climb great (you can really feel that lighter weight on a hill). My perception is that they help on hard rides/races quite a bit. Perception is reality.
What else do I have to know?
What else do I have to know?
10-05-07, 01:29 PM
#225
Peloton Shelter Dog