Calculating wheel rate / frequency

[grintch]

When calculating wheel rate or frequency, do you have to consider the motion ratio AND the shock mounting angle?

[divebomber]

corner-carvers.com/forums/showthread.php?t=27574

Uh, are you sure your question isn't just mind taffy? I can see how in the planning stage you're thinking that's going to affect it, but suddenly there's shocks and springs that work a little differently than you've planned and, well, maybe you'll be happier if you let the forum info from that link occupy your thoughts instead.

Just a thought, and no, I'm not an engineer.

[grintch]

Didn't find anything useful there. I will look at the posted formula after I get through the registration process.

Just for reference I have a Locost 7 with a rather poor motion ratio in front, and like most 7's, the front shocks are at a ~45% angle. After a track incident I need to redo the front suspension, so I am looking to improve the geometry. Looking at Allan's Race & Rally Car Sourcebook, a 45% shock mounting angle would have a significant effect on the wheel (effective) rate, however the motion ratio diagrams often show the shock mounted at a significant angle but there is no clear guidance on if you need to consider both in the rate calculation.

[tonycotton]

Allan wrote an interesting piece relating to this topic in Speedscene which he kindly allowed us to reproduce in our club magazine website. Here is the link. I hope you find it useful.


EDIT

My apologies - although Allan, the author and copyright holder, gave permission to put the article on our website we have received a complaint from the editor of Speedscene, the club magazine of the Hillclimb and Sprint Association where the article first appeared and have accordingly removed the article. Which is a pity.

[grintch]

Yes - this is exactly what I was looking for. Thanks!

(still waiting for my corner carvers registration to go through)