Sign in to follow this  
ThunderDragonCy

More caster c hubs on older chassis? How much to add? Any 4WD buggy racers got some help?

Recommended Posts

So I'm sitting here a bit bored at Taipei airport waiting for my flight home wondering idly about a new design project. I've noticed that top end 4WD racers have caster angle built into the c hubs to add to the kick up at the front of the buggy. Added to this as I've been filling my evenings this week whilst here on business, I found an article on Jamie Booths Manta Ray from 1991 and he says one of the biggest things he did was get some extra caster added to the custom c hubs he had made. 

I have a Thunder Dragon and a Terra Conqueror DF01 now, and I think fairly easily I could do caster c-hubs for them via Shapeways. I just have no idea how much to add. My DT03 has 25 deg, but I haven't seen that much on 4WD for some reason. Anyone got any ideas? Looks like both my buggies have something around 10 deg kick up, so should I be trying to add 5 deg? 10 deg? 15 deg? 

All help, hand waving, wild speculation greatly appreciated. 

Cheers!

Share this post


Link to post
Share on other sites

I was curious as to why 2wd buggies had so much front kickup but not 4wd. I looked it up long ago and am fuzzy on the facts but I recall it had something to do with kickup effectively shortening the buggy's wheelbase on shock compression. Not a problem on 2wd, but on 4wd it does wonky things evidently due to all four wheels being driven. I imagine it doesn't do wonders for driveshaft angles either. But my vague memory may be best left as "wild speculation". I guess 4wd buggies could make up for the lack of kickup with caster built into the c-hubs (?). I remember Jamie Booth saying the early outings with the Egress did not go all that well. They were heating the lower arms and sticking a screwdriver through them and twisting them back to get some more caster angle if I recall. Of course part of that issue (the wandering, nervous nature of the Avante lineup) also deals with those cars' terrible scrub radius issues as well. I could be off on all this but its fodder for discussion.

Share this post


Link to post
Share on other sites

You're right about why they have less kick up. I am keen for someone who maybe has one of the TRF5XX buggies with castor blocks letting me know how much caster to add

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this