Anders, I love your bike and self made turbine!
Your build site is one of my "must check" nearly every day for the past few years. Actually running it and the speeds you have attained is just spectactular.
Your Kamm tail idea is interesting and should be an interesting experiment. I have used the Kamm tail on 2 vehicles, one a Bonneville 500cc streamliner and the other a 125cc motocycle for the Vetter High Mileage contest some years ago....(about 35 years, but who is counting?) I will attach some photos of the streamliner model and the car as run at Bonneville and some pics of the bike with and without a rider. Your idea of having a tank for resting your chest on is something we did as well and it worked wonders for us on our long ride. Having your chest supported by the bike helps you with steering control as you only need your arms to steer the bike, not to hold your body up.
This picture shows the top view of the streamliner model with the clipped tail.
This picture is the car without the wheel covers and unpainted showing the fiberglass foam monocoque
construction. We had to supply info to the SCTA throughout the construction to let them see how the
car was built as there was no tube chassis.
This is a pic of the car running at Bonneville, we made 137 MPH with a Triumph 500cc flat track motor
that came out of Gene Romero's bike. It had about 48 hp so the Kamm type tail didn't hold it back so much.
This is the car in line showing the flat tail. I did have the tail open to use the vacuum at the
rear to help draw in air for cooling the motor.....at least that was the theory!
This is the 125cc Suzuki with about 10 hp that we ran cross country. This also has the Kamm type
tail with the opening for theoretically filling the turbulent air with air coming through the shell.
A better pic of the back tail.
This pic shows how the rider creates much drag as we were not able to get down as we wished.
The problem with bikes and riders is that the riders body is terrible for aerodynamics and it would be nice to spend a few days in a low speed wind tunnel to see what could be done to help that out. I would like to see the difference of a Kamm tail compared to a tapered to a point tail as the turbulence from the rider might just screw up the best of streamlining from the rider back, it would be fun to try!
Just keep the info coming, your experiment is very interesting to many of us out here!