1. The problem statement, all variables and given/known data Determine the maximum velocity attainable by a vehicle with the following conditions: RWD 6% grade Weight = 20 kN CG is 1.25 m behind front axle and 0.5 m above ground level. Wheel base is 2.8 m. Effective rolling radius of wheel = 30 cm Coefficient of aerodynamic drag = 0.45 with frontal area 2.3m2 ρ = 1.25 kg/m3 Engine develops peak torque at 45 kW and 4000 rpm The rotating inertia of the gearbox is and engine is 0.454 kgm2 The rotating inertia of each wheel with driveline is 1.76 kgm2 coefficient of friction between road and tire μ = 0.8 2. Relevant equations Wr = (W l1cosθ + Rah + W h sinθ)/L Max Tractive Effort = μ Wr Ra = 1/2 ρ V2 A CD 3. The attempt at a solution To solve this problem, I was going to first determine if the wheel torque is limited by the vehicle motor or by road adhesion, then find the maximum velocity using the limiting torque. I can get motor torque but am stuck at this point as I am not given a gear ratio to be able to convert motor torque to wheel torque. TM = 30 P nrpm / π = 107.43 N/m I know how to solve for everything else, its really just the the conversion to wheel torque that I'm stuck at (unless I'm approaching this problem entirely wrong).