Quote:
Originally Posted by orengomotors
Hi Darcane!
Well, in spain we do the soapbox racing in public streets ( closed during the event) and the track is pretty long, watch this video:
---https://youtu.be/nTqPZygdRRU---
My soapbox is unfinished yet, the max speed that i reached is about 60 km/h ( about 40 mph), but the top level ones reach 95 kmh (near 62 mph).
i'm not sure too about how to calculate the cd, it exists some empirical method?
some advice?
some drawings of the body shape:
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The lowest drag bodies are fully-enclosed,including the wheels.Even with a larger frontal area they have low overall drag.
Here is a Honda Dream solar racer of the 1990s with Cd 0.10.
For your race car,for safety's sake,and handling,you may need to make some compromises to aerodynamic drag.These really low drag shapes aren't intended for speeding around curves.
This template embodies low drag architecture
Seems like you'll want the car as low to the ground as you can get it,to keep the center of gravity low.
Shrink-wrapping the body around you and the chassis will reduce frontal area which is good drag-wise.
If you take the wheels outside the body the drag might degrade to Cd 0.15 or so.A lot depends on the width of your tires.And your tires may be the only thing that keeps you on the track without torque-vectoring of a powered car.
The wheels can protrude into blisters if your concerned about frontal area
