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Parris crank mod

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I know this has been discussed before,and all the pros an cons why it wont/will work, but,has anyone ever actually rode or seen a bike with this mod sense it has been around for a while now?

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Is this the one with the swirl marks for "turbine" effect cut into the crank wheels?

If so, I read a test several years back that showed ZERO conclusive gains/losses from this mod.

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The theory and idea would actually work had the machine the crank the entire gap between the small lines they did.

for it to actually move a significant amount of air it would need more displacement than the small grooves they do. It basically would "calvitate", or just have a small barrier of dead air it was cutting through as it spins.

If it were machined in a way that actually had "paddles" with sizable gaps to catch and push the air, it should add significant increase in power.

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On there web page the power gain they state is at a different elivation. If your going to state a power gain do it on the same dyno in close to the same conditions.

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