## FSAE car design - Shelby67

Please discuss here all your remarks and pose your questions about all racing series, except Formula One. Both technical and other questions about GP2, Touring cars, IRL, LMS, ...
Hi guys,

We are designing a FSAE and I have to design the suspension elements. All dynamic calculus are finished, but I have to design uprights, wishbones, pushrods…
My question is about ball joints how can I calculate the size I need.

I think I must take the loads at the contact patch and translate them to the joints, but if I do that the forces at joints are very high. I’m thinking that it could be because my loads at the contact patch aren’t right.

My critical loads for a 290kg car are:

Are too high?

Please say me if the “my process “ is wrong.

Kind regards.
Last edited by mx_tifoso on Fri Jan 14, 2011 5:29 pm, edited 1 time in total.
Shelby67

Joined: 14 Jan 2011

Probably better to ask at fsae.com
Grip is a four letter word.

2 is the new #1.
Jersey Tom

Joined: 29 May 2006
Location: Huntersville, NC

Though I've never been involved in Fsae I ussually use it as a resource site.

I find it easier to use google to search the site.

site:fsae.com loads at wheel patches (for example).

It seems to me the values arent quite right. I know fsae does more than 1g turning

290kg = 2942N / 4= 710.5N. But we all know the 4 tires don't generate the same force

If it's the same front to rear. 1471N per axle. If the outer generates 75% of the force that's 1100N and I'd guess it's more than 75%

If you get 1.5G in braking(conservative, I think) With a 60/40 distribution.

290kg->2942N. 1.5g in brake would be a total of = 4413 N. 60& at front = 2647N. 1324N per wheel at the front.
Come back 747, we miss you!!
Caito

Joined: 16 Jun 2009
Location: Argentina