Motorcycle CFD testing

[isiahstites]

Interesting..........

http://www.union.edu/academic_depts/mechanical_eng/students/projects/09/Barsukov_Kostyantyn_FinalPoster.pdf

[DarthRider]

Yes, very interesting.
Although this bike is obviously not the poster child for aero cleanliness, old Rollie Free did what he could to go fast & get his record.
The most obvious things were stripping down to shorts, wearing a rubber bathing cap and laying prone on the bike.
Note also what he did with the fork tubes. The forks are constructed of two round tubes on each side. Rollie used "friction tape" (tar tape) to modify the double "dirty" tubes into a "cleaner" oval shape.
This taping was one of the things Herb Harris reconstructed on the bike for it to be 100% accurate.
Note also the bike doesn't even have footpegs.
I think it's like the old adage, "Take care of the pennies and the dollars will take care of themselves".
Take care of the small timing slip numbers to the right of the decimal point, and the large numbers to the left will take care of themselves...

http://ijms.nova.edu/July2006/Rollie%20Free's%20Vincent.jpg

[jamming]

http://upload.wikimedia.org/math/7/2/d/72d686af4bdf6ffdff7928e3a20cb4b5.png wherehttp://upload.wikimedia.org/math/1/c/4/1c4324ffa23e907e24a08ea376d7ed99.png is the force (http://www.motorcyclistcafe.com/wiki/Force) of drag,http://upload.wikimedia.org/math/e/e/e/eee46d1e74736ad996b1bb9f715080e8.png is the density (http://www.motorcyclistcafe.com/wiki/Density) of the fluid,[3] (http://www.motorcyclistcafe.com/forums/#cite_note-2)http://upload.wikimedia.org/math/0/a/e/0ae00583bb2847dd6af36d093568d7d4.png is the speed (http://www.motorcyclistcafe.com/wiki/Speed) of the object relative to the fluid,http://upload.wikimedia.org/math/6/1/f/61fabb89e875ffa3f2cfa254bd485dea.png is the reference area (http://www.motorcyclistcafe.com/wiki/Area),http://upload.wikimedia.org/math/3/1/2/312af36c09619fbcb81ee92ee134e2c1.png is the drag coefficient (http://www.motorcyclistcafe.com/wiki/Drag_coefficient) (a dimensionless (http://www.motorcyclistcafe.com/wiki/Dimensionless_number)parameter (http://www.motorcyclistcafe.com/wiki/Parameter),, andhttp://upload.wikimedia.org/math/6/a/b/6ab377c3a0c3a17e934aabe7d43c5832.png is the unit vector (http://www.motorcyclistcafe.com/wiki/Unit_vector) indicating the direction of the velocity (the negative sign indicating the drag is opposite to that of velocity).

I wonder if this was the formula they used. Oddly enough this one of the formulas we use to demostrate to the FAA we have not added to much drag when installing antennas on an aircraft.

Cool stuff....a little "cleaning up" goes a long way.

[Donson]

Rog,I got Yer "dimensionless parameter" right here....:remybussi:

[jamming]

Rog,I got Yer "dimensionless parameter" right here....:remybussi:

:blbl:

Hey, I'm just a dumb mechanic.

[Donson]

Rog,I have been advised that the conservative Canyon folks wont allow a Peckerhead float. It will have to be a Woodpecker float.We will have to have Our own Parade,eh? A parade of dimensioless parameters!:028: