Beckman's physics of racing

[Mafdark]

@1320-20V

He is talking about the weight transfer is if the height of the CG is the only component in weight transfer…

In my explanation i only talked about braking torque weight transfer.

His example only applies to a car with a 50/50 split and no f/r braking bias.

he is saying that because of the 50/50 and the front and rear are both braking equally there will be weight transfer.

What I am saying is that because of weight transfer, there will not be a 50/50 split and therefore you need to account for longitudinal and vertical forces.

I completely understand your point Os. and its a good one in things like busses and tractors. but race cars generally have low CG’s perhaps below the spindle even.

You really need to establish the vertical and horizontal components of the CG in both axis, and then sum the moments in both directions.

Pleasure to talk engineering with you as always!

i should send you the products of my stresses in rotating rings talk. Tuns out the failure mode was actually in bending as a result of some poor interpolation of a compound curve into angles with a bit of stress concentration added in.

I think you’re getting carried away a bit. Yes, the location of the CG horizontally on the chassis will have a greater effect on a vehicle during braking than the height of it in a typical race car, and yes the the height of the CG will cause more pronounced effects during lateral movements.

However, for the sake of understanding the basic concepts of weight transfer by using an example of a vehicle with a 50/50 weight ratio and a wheelbase of 100 inches, he was able to simplify the math to a level suited for me to post this on an online forum. This is not from an engineering text book nor data for a forumula SAE team to calculate and digest.

To say that the information in my post was wrong or a waste of time is simply untrue.