And the ankle is on the circumference of that circle, or really even a little outside of it, not within it. So why would you be making a radius around the ankle?
Again, you shouldn't rotate around the ankle, you should rotate away from it. So even if you rotated parallel to the ground, then the basic geometry says the distance between the ankle and hip must still increase.
To keep that distance the same would just about require rotating on an incline that is tilted in the wrong direction.
It's just hard to imagine what the swing you are describing looks like. Sway so bad you really do end up centered over the trail ankle, followed by a massive reverse pivot?
I'd estimate it's in the 40-50 course range, mostly in the Carolinas. Some of my favorites have been:
Caledonia- Pawleys Island, SC
Thornblade- Greenville, SC
Stono Ferry- Charleston, SC
Rocky River- Concord, NC
The Walker Course- Clemson, SC
Just finished a big (multiple week) job on my truck and I wanted to point something out to anybody willing to read this. I sometimes get crap from people (mostly co-workers and stuff) about "how can you afford this/that, you must make the big bucks." No. I would have to say the #1 reason my wife and I have as much money in the bank as we do is these top 3 reasons:
1. We don't have kids (lol, that was an easy/obvious one)
2. We don't blow money on big $100+ drinking nights out or fancy restaurants even though we can afford to do so. We enjoy the little things and we are happy to have a nest egg to keep our stress levels lower
3. I do a lot of DIY, including with our vehicles. And it's the vehicles that pays off BIG TIME.
Case in point: My truck is old but I still love it. But it had creaking and wobbly sounds that were tough to diagnose. Not a single mechanic I brought it to could properly diagnose it (by a LONG shot). So obviously they all recommended to start replacing the typical suspects and see which one ends up fixing it: wheel bearings, front rotors and pads, ball joints, sway bar bushings, tie rod and bushing, sway bar end links, control arm bushings (I ended up not installing), and shocks. Those were all suspect.
All of this work was quoted at >$4,000. The lower ball joints alone was $1,000 just for labor, by the way.
The truck is only worth probably $3-4k.
I bought all of the parts for $180 + $50 for 2 nice new deep socket sets + $75 for some harbor freight tools including and angle grinder, some better jack stands, an air chisel, grease gun, etc. + $40 for a NICE Milwaukee metal drill bit set
So total was $305 for parts and NEW tools. Plus I rented a couple things that I turned out not needing. BTW I did the wheel bearings a few weekends before this but that wasn't long and only $100. That wasn't in the shop's quote since I had already done them.
The work took about 22 hours total over 2 weekends. Car was safely drive-able after each weekend no problem.
1. I'm a ROOKIE mechanic at best lol.
2. This is on a freaking DODGE. Dodge's are notorious for being a royal pain in the caboose.
3. 2/3 of the total time was spent on one side of the car learning how to do this stuff as I went (and youtube).
4. Everything was rusted to hell. That takes time.
5. I don't even own a freaking impact gun guys. That's like the fundamental mechanic's tool to have, and I don't because I'm a cheap guy haha.
So bottom line, $300 for parts and some new tools I can use anytime in the future, and I now have $4,000 in our bank account that is free to use.
I also know that it was done CORRECTLY. And isn't it funny that the rookie mechanic (who hit his own thumb with a sludge hammer in the process... yea that hurts (still...)) completed this job with rookie tools, rookie knowledge, on freaking jack stands, in less time than the quote 25 hours to complete the job that the shop quoted? I understand they quote based on worse case (having to cut parts out because of rust and such) but EVERYTHING on this truck was rusted beyond belief and had to be cut out basically. I still handled it in < 22 hours.
Ask yourself: would you be willing to work hard for 22 hours at a rate of ~$168 per hour? Granted there's some risks involved. Maybe some people they aren't worth it. But I even factored in if I had to rent a car for a few weeks because I royally effed up I'd still come out way ahead.