Streamlining CBR600 for Bonneville & Vetter Challenge

[redyaris]

I have the under tray done and will install it this weekend and begin work on the front side panels. I have the 34 tooth rear steel sprocket, which will be paired with the 17 tooth front sprocket, to reduce the engine rpm by 30%. It will be interesting to see how low this bike can go on the fuel economy scale. I will post some more pictures soon.

[redyaris]

Here are some pictures of the progress so far. In my designs the under tray is very important in that it is part of the suport structure for the streamlining/body work.

[Stan]

Originally Posted by redyaris

If I can get close to 100mpg in the Vetter challenge, and get into the 150mph club at Bonneville then mission accumplished.

Very interesting read, redyaris! BTW, how did you do in the Vetter?

[beatr911]

Redyaris, great fab work. Looks like it will be very strong. Kinda sounds like you are making a bit of an exoskeleton structure.

Other than gearing, any other changes to the engine, driveline?

[redyaris]

Stan
With my Honda VT500 Streamliner I got 73mpg on the 225 mile 2012 Vegas to Barstow Vetter Challenge. I will be doing some small improvements to see what can be achieved with no gear ratio changes [due to shaft drive] and then I will look into having some gears made for the VT500, to change the primary gear reduction by 20% - 30%...

beatr911
I have no plans for changes to the engine or the drive line other than going from 15/43 sprockets to 17/34 sprockets. The rear frame is so much more rigid with the new support struckter, bolted onto where the passanger foot rests used to be bolted on. I am wondering at this stage how the bike will behave from stand still, especialy starting on hills, with the 30% reduction in rpm.

[3-Wheeler]

Originally Posted by redyaris

[.....I am wondering at this stage how the bike will behave from stand still, especialy starting on hills, with the 30% reduction in rpm.

redyaris,

I'll bet you will get used to it pretty quickly.

I changed the gearing on my rear sprocket from a 43 tooth to 34 (26%) and it took only a short time to slip the clutch that little extra.

Jim.

[redyaris]

Here are some pictures of the slow progress on the CBR600, and a picture of a home made wind tunnel buit by a friend of mine for a science olympics event for junior high and high school stundents. the students where given a 3"x3"x9" long peace of styrofoam insulation and where challenged to build a "car" like object, and the winner would be the team that had the lowest drag as tested in the home made wind tunnel. the original block of styrofoam had drag of 100 the best "car" had a drag of 31. After the event one group asked if they could improve on there design and they managed to get down to a drag of 26.
There is now a group of high school students who understand basic aerodynamics...

[renault_megane_dci]

not only understood but practiced and it will stick to their mind that much better !

[Stan]

Very cool! That wind tunnel looks like a replica of the Wright Brother's first wing tunnel.

[beatr911]

Hey, can you use it to tuft test a section of the fairing at a time in your shop?

Oh, as a baseline, what is the stock potential of the CBR600? A co-worker just purchased an F4i and appears to be getting our sickness. He normally drives a diesel monster truck.