I recently joined this project, and as I saw the picture I felt that there is something that lacks in the design.
The fans are placed in such a way that the body of the car is itself causing an obstruction in the air flow. This would lead to decrease the push power of the fans; hence causing no, or very less speed movement of the car (imagine the situation if the delivery product is placed over it). Also there are few other problems, like steering. So, keeping all these in mind, here are few ideas to deal with it :
1.) Placing the motors -> Instead of using the motor-fan system at the rear end, it should be placed in the front. Also the motor attached should be more thin, and the air flow should by guided by a straight pipe (of diameter nearly same as that of the circle made by movement of the fan) through the hull of the car to the rear end. Also, in the rear, there should be a nozzle, which would help create increase the speed of air flow, hence providing more push to the car. Further, the equipment like batteries, chips, etc. should be placed in between the gap present between the two pipes.
It would also help the car to be more aerodynamic, hence causing less air resistance.
2.) Providing the car, the ability to steer -> To help the car to steer easily, we need to put flaps at the end of the nozzle. The flaps would be connect to a small motor (Steering Motor), which would cause them to move, hence help in change the direction of the air flow. Further, the front wheels should also be connected by the same motor to which the flaps are connected, this will make the wheels to turn. (The flaps and the wheels can be connected to the steering motor using strings, or thin spokes).
Further, if only the wheels are movable (i.e the steering motor is not connected to the flaps); then, at high speeds when the wheels turn, the thrust of the air would cause the car to skid off its path.
Also, if only the flaps are movable (i.e the steering motor is not connected to the wheels); then, when the flaps are moved, due to fixed wheels there might be minimal, or no change in direction of the car.
So, we must connect the steering motor to both, i.e the wheels as well as the flaps, for better steering, even at high speeds.
3.) Weight of the car -> Weight of the car is also a very important factor. If there is extra, useless weight, then it would put more pressure on the tires , hence causing more resistance in the movement of the car. So, the weight of the car should be kept minimum (as much as possible), by using light-weight material, removing useless materials & equipment. Further, decreasing the weight of the car would increase its speed, mileage, braking power, cornering abilities.
4.) Air resistance -> The car should be as aerodynamic as possible, so that the speed as well as the stability of the car can be increased.
I hope that these would really help in the project, also if get to another ideas I would surely post it . For your views and queries regarding this, Please reply!!