Rules for the Concept Car Challenge

Pictures please...

I like the body idea. I have and am working on something similar for it and similarly shaped fenders. If I had a couple of these guys mad skills and equipment, I'm sure I would have been done and tested by now. With the fenders shaped similarly the challenge has been what to do with the rear wheels. I think ultimately, if I don't get a teammate I'll inset the rear instead of the front. I know you want to keep the rears away from the rail.So,I haven't done it.
And, getting the weight right with such a body design would be a long process. Anytime the weight is built in you end up either over or under and then have to figure out what to do.

Since no one else bit, I'll put the car back in your court with a few questions.
1) Where are you looking to run such a car?
2) What is the wheelbase on this design? If the wheels are place that far forward on the body, and the fenders are in front of that either the pic is way off or the wheelbase is really short. Remember 7" total front to back.
3) What would you run between the fenders (for the starter pin)? Nothing can stick out (at least in the rules that I have read).
4) If you can run razor wheels, what would be the advantage of the fenders?

Nice sketching technique!

I'm actually working on a design that utilizes the tear drop with standard wheels. Picture a catamaran with the tear drop as the axle cross bars.

I've never worked with razor wheels, but, my first thought is that you'd actually be increasing the cross section of the car vs. just the razor wheels. Your idea might give more advantage if adapted to BSA style wheels. (But I'm biased because this is almost what I built for MA)

I'll let some of the guys with more razor knowledge chime in...

Reynolds number is about 51,800 - 55,300 for our speeds so in between 10^4 and 10^5 where the flat plate crosses the 0.01 line.  Assuming the following

Free-stream fluid velocity:  15-16 ft/s
Characteristic distance (or pipe diameter):  7"
Fluid density:  1.177kg/m^3
Fluid viscosity (dynamic):  1.846E-005 kg/m-s

a flat plate has less drag than an airfoil (Drag coefficient airfoil = 0.05 , flat plate = 0.01).  The problem, of course, is that you need some depth or thickness for the weights.  

HT08 (ht08-il)

Thanks, kinda loose, but gets the idea across I guess.

Yes, fenders are more effective on BSA wheels due to the wheels large face.
Yes, I'm sure Razor wheels are more effective at passing through air than fenders.
Still, the fenders being so slim should pass air and steer it while also putting the spinning wheel in a air neutral space.
Plus it would look cool as shit 😁👍

Your idea is interesting as well. A variation of the Hole Body style.  My understanding of that style is the air needs to be move twice.
But it can make for a very lite body

So when we look at drag (for our purposes) there really is two drag forces we deal with.  1) pressure drag/friction - this depends primarily on the area as seen from the front and the speed of that area.  It is like your hand when you stick it out the car window.  It is harder to hold a clipboard in the wind than your hand.  2)friction drag - to understand this consider we were trying to move the car through molasses instead of air.  The car surfaces would stick to the molasses.  It would be harder to pull a 10 foot plank through the molasses than a 1" plank because the molasses has more surface area to "grab".  

Since the razor wheel is basically a flat plate, it doesn't benefit greatly from an airfoil fender to reduce the pressure drag.  The additional length and surface area though, does serve to increase the friction drag 4x - 5x.