Dolsum wrote:Hi All1
To know more about driveshaft twisting, we must know the torque. In one post mention around 240 Nm engine torque! right engine! after the gearbox we will have around 2000 Nm to 2500 Nm, peaks of 4500Nm, so twisting angles are quite considerable, around 60degress is not a crazy idea.
Cheers!
I haven't re-read this entire thread to see what engines or cars you got those numbers from, but the original post was about F1 cars. And you're basically right, we need two numbers - the torque and then the driveshaft stiffness.
While an F1 car might have something around 300Nm of torque, the clutch can transmit quite a bit more in certain situations like standing starts or during shifts, around 1000Nm. 1st gear is usually going to be around 3.0, which gives us 3000Nm but I'll be generous and use your peak torque of 4500Nm.
The stiffness of a modern F1 driveshaft is usually going to be 200+ Nm/deg. The lowest I've heard of, which was in the not-too-distant past, was about 140 Nm/deg. That gives us a maximum of 4500/140 = 32 degrees, in what I believe to be an extreme case (in fact, using a modern clutch with really low gearing and an older driveshaft). In reality, I would guess no more than half that is ever experienced.