Hey, folks, next time let me know that I wrote "taper" wrong...
Wind tunnel - first of all, doing a 1:1 scale racer in the wind tunnel cost a lot - also they will get a hard time with the wheel configuration of the streamliner - at last - at that speed - 300+ mph - the most vehicle wind tunnel are out of range.....
Also it's hard to check different aerodynamic configurations of a streamliner in a very short time - to save money - or you be interest to build five different sets of body panels....which you can change in five minutes.
The computer simulation is today to a level which give you the necessary feeling if you be in the right direction or not.
We done here in Germany the computer simulation in the free time of the wind tunnel experts - they was always interest to do something special as the normal street vehicle, may be you got the luck to find someone at your area who like to do it also for fun.
The base concept of this streamliner is alright - there is not too much to change - take care about the main rule of aerodynamic
- the big (taper) angle is in front, the soft one in the rear
- important is, how you go out of the air, means a clear rear end - and not how you go into the air - means front end - but it helps if the front end is also clean
- steps are not helpful and the Reynolds number had to be focused, too - no problem with the Roy streamliner - he is round
enough....
If you got a question in the detail - let me know and I will give you my opinion