Dunno if this is right but here is my theory...
Wind resistance (force) is given by Cd * density of air * area * velocity
the clutch is designed to take a torque load of approximately 1.4 times the max torque of the engine. Say this torque be "T"
Now for the clutch to slip, the wind resistance must exceed the torque the engine produces.
since torque and force cannot be equated we convert it to power. So we equate the work done by the wind resistance against the moving car and the work done by the engine against the clutch.
since the clutch can already take the work done by the engine, we can find the theretical limit at which the clutch will start to slip.
work done by the engine against the clutch per second is equal to the power of the engine. which is 107 * 736 watts or 78752
now the work done by the wind resistance against the car per second is the product of wind resistance and the velocity of the car.
so work done = Cd * density of air * area * velocity * velocity
Cd is what ??? .7 for city??? lets assume it is 0.7
density of air is approx 1 so it can be neglected
velocity in this case is 150 kmph = 41.67
now according to out formula, for the clutch to slip at 150 kmph,
0.7 * 41.67 * 41.67 * frontal surface area of car = 78752 * 1.4 (factor of safety the clutch)
or frontal surface area of car = 90.79 square metres
i am not sure how much the surface area is going to be. but this looks to be a pretty big amount. My guess is the only areas that might cause drag are the front bumpers. the bonnet and windshield may not cause that much drag.
If my theory and calculations are right then it can be inferred that the clutch will slip at 150 kmph if and only if the frontal surface area is equal to or more than 91 square metres.
I have neglected transmission loss here. I think the clutch slip will be around 0.8??? right psycho? not sure... but still considering a factor of 0.8 means the frontal area works out to around 72.8 square metres still.
if some one can come out with a approximate value for the area then i think we can find at what speed the clutch might slip due to
aerodynamic drag alone