Originally Posted by imjonah
2. A Related question Formula 1 is by far the fastest road course chassis style and its close cousin the Indy car chassis the oval, yet the F1 open wheel style 2WD chassis seems slower when talking about 1/10 scale.
3. Is there some other factor which ROAR rules outlaw but if used on 1/10 scale would make them much faster some kind of braking system not dependent on the motor. Some kind of electronic traction control device or gyro. Wider track relative to wheel base? Over size tires? Extreme weight reduction?
In otherwords what would a no limits no holds bared 1/10 scale on road racer look like?
In terms of system parameters, what does an optimized Full Scale car look like? It has the lowest mass and the highest power to weight ratio. It has the stickiest possible tires and makes the most downforce. Beyond that it is highly tuned.
Scale Down Mass at Constant Density of Materials:
m_L = m_B * 1/1,000
the mass of the little car goes down by the scale fraction cubed.
Many cars benefit from lower density materials at small scale. The F1 car uses the lowest density materials of any 1/1, so you don't get as much boost in this style by using low density materials at 1/10.
A tire with less weight on it has more cornering power, meaning it can pull more g's in a turn. The F1 car takes advantage of this at 1/1, and all 1/10 scale cars benefit from much greater mechanical grip because the weight comes down by 1/1000. A good 1/10 car can pull at least 2 g's with no downforce, a great 1/1 car might get 1.4 g's mechanical grip in low speed flat turn.
The Lift Coefficient and Drag Coefficient should not change if the shape of the body and under-side are exactly the same at both scales. Of course the 1/10 scale builder doesn't spend $$ in the wind tunnel, and the under-side is usually much different.
Chances are an F1 style design would be fastest at any scale if you had the budget to do research and development and put all the parts together to get the lowest mass, best mechanical grip, highest power to weight ratio, and best downforce with the least drag. But maybe there is a limit on optimizing at a smaller scale, such as all cars using about the same density of materials at small scale.