Quote:
Originally Posted by aerohead
Just now caught your thread.
* The scale of your racer may necessitate some wheel travel,as at 30" overall length,and small diameter wheels/tires,the smallest track deformity could cause the car to be thrown out of control.
*Really spongy-gummy tires might deform enough to absorb some surface irregularities.Don't know.
*If so,then you'd want a body shape incapable of generating lift,most likely would want to intentionally generate downforce,of which the motor /battery will have to overcome this additional drag.
*At 30-inches,instead of 30-feet length,you'd have to test your model at 2,400 mph,to properly simulate 200-mph full-scale effects.
*That's impossible,due to compressibility effects.
You have some really unique challenges. Quite a project! I'll do some thinking.
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The 2,400 mph comment is that in relation to wind tunnel testing? I was hoping multiple 150mph related leaf blowers might do the job.
I have had some issues with suspension, which I will not get into. The world record holder did not have suspension.
My current setup which I believe is great uses aftermarket A-Arms which are high in nylon content and solid links in replacement of the shock/spring combo. The Nylon A-Arm acts lick a spring itself yet is very stiff also. There is also some give in the BSR foam tire. I previously had some very stiff springs rated around 25lbs each and with the down force of my front splitter the front chassis was scraping.
Here is an image of the current setup. I need to get over to my friends house with a TIG welder and adapt the "shock tower" to have the shock mount be lower and more directly over that location. This should help reduce the frontal area.
I had a great image showing c/d ratings related to the bottom of the car's height off the ground but at 3.5 cm I do not believe there is much room there to take advantage of significant air flow?
-Liberty