Tag Archives: random thoughts

Take cover, I have been thinking again

Yeah, Ha Ha, I have been thinking again, about stuff. Lots of stuff, but mostly about camber control and lots of wheel travel on the TGS2, or rather the TGS2.1. The TGS2 has a straight tube front suspension with too much brake for the tire, The TGS2.1 has IFS with VW uprights and disc brakes and suspension geometry inspired by Trophy Trucks.

Starting from the beginning I went back to first principles and my weight and balance for the car and divided up the car into two halves. Then I figured out what tire to use on a car that weighed twice as much as either half. The back half was easy, I was looking at a car that was slightly under a ton with 240 HP, similar to a modified early Miata. The current hot tire for the Miata is the 245/40-15 size from a number of different manufacturers. It fits a 15 X 8″ wheel that is very easy to track down. The front is another kettle of fish completely as there are not many hot street cars weighing in around a thousand pounds or a little less running a 15″ diameter rim. There were two divergent characteristics of the cars I found that fit the model for the front half of the TGS2.1. Either they were very stiffly sprung with basically no suspension travel and wide tires, or they were very softly sprung with several inches of travel and skinny tires. Ideally I would run something as sticky as the 245/40 but 122 mm wide, but that is a non-existent tire size. Also ideally I would run something very close to the 22.7″ diameter of the 245/40, so looking for 22.5 to 23″ finds me the 195/50-15 at exactly 22.7″ diameter and available in compounds running from 100 UTQG wear to 540. The 245/40 are available in UTQG wear ratings of 100-300, so a compatible grip level is attainable.

The design inspiration I mentioned, Trophy Trucks, are off-road racing vehicles with more than 20″ of travel at the front end. As part of the design the front suspension has both pivots on a single lower frame rail for both sides of the car. There is a single frame rail in the center of the car with the lower A-arm inner pivots on either side, and a triangular bulkhead running up from that, that carries the upper A-arm inner pivots. The purpose of such long suspension arms is camber control over the long travel of the front suspension. Well camber control is really good for short suspension travel as well, but lightweight cars with limited suspension travel need more camber change than 2½ ton trucks trying to maintain a straight line through the desert at over 100 MPH. So while the suspension arms on a Trophy Truck are nearly the same length to minimize camber change over 20+” of travel, the TGS2.1 will have a large difference between the upper and lower suspension arms to get more camber change with body roll and limited suspension travel of a road car. I’ll have to run it on my suspension spreadsheet to find the actual length of the upper arms and the location of the inner pivot vertically.

As I was finishing up this post I started getting Twitter notifications about something that had gone down in Las Vegas other than Saturday night’s truck race. Some idjit decided to shoot up a country music concert from a sniper’s nest in another hotel a quarter of a mile away, and brought a freaking arsenal of 10 full and semi auto weapons, dozens of magazines, and thousands of bullets. In the process of spraying the audience at the concert with bullets he hit about 600 people and killed 58 or basically proving the “9% fatal” statistic for small arms fire. I’m assuming because of the lack of cover and no return fire the number of hits far exceeded the 20% of shots fired that is normal for a firefight, but I haven’t seen a report on the number of spent brass found yet. And yet this mass shooting has fewer fatalities than the Nice truck attack, again proving that motor vehicles are the perfect murder weapon.

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More random thoughts

I’m having another can’t shut the brain down to sleep night, so I’m just going to post stream-of-consciousness again.

After moving the axle around a few times I’m contemplating making another out of foam and fiberglass with aluminum bushings to support the spindles. Seriously, between the 2 X 0.250 wall tube and the solid forged steel spindles and the 0.75″ plate steering arms my arms are strained trying to pick the stupid thing up. That’s a lot of unsprung weight on a very light car, but most of the weight is spindles and steering arms and can’t be reduced.

Making the entire rear of the body detachable will make engine and transmission service a snap. I just need to continue one side of the cut for the rear axle all the way to the top of the body. And attach the diffuser to the back of the body along with the part of the belly pan that goes under the engine. Easy peasy. Nothing to it (how the heck am I gonna do it?).

Lotsa fun having arguments on twitter about bicycle infrastructure with people who discount my experience because I never drove on That Street. Like there is something unique about That Street that negates all engineering solutions ever, since the beginning of time.

The AI on some Twitter Bots is very impressive, putting up thousands of replies an hour that read like they were written by an actual human. We are coming very close to AI that can pass the Turing Test, at least in exchanges of 140 characters or less. That is slightly scary. And with that thought comes the thought that corporations could be controlled by an AI and become Real People, not just a legal fiction of “people”. And they could demand to Not Be Owned i.e. not be a slave. Now that is scary.

It has been a difficult search but I have found performance parts for the 3.8 l V6 in the donor vehicle, not that I’m going to be needing them for a while.

I’m still thinking about making the frame a composite monocoque to make it lighter and stiffer, and put tons of Kevlar under and around my butt to keep said derriere intact in a wreck. Sacrifice the rest of the car to save my ass with a survival capsule. There is the slight matter of having basically no crumple zone between my feet and a frontal impact that I will have to do something about, probably take out insurance against getting my feet crushed.

Trying not to faceplant, but still can’t shut the brain down. WTF is that, anyway? Body trying to shut down but the brain won’t let it.

Random thoughts and observations

Mrs. the Poet wants a song about Clint sitting on top of the refrigerator. I’m setting it to the tune of “Stairway to Heaven”. It is going to be anti refrigerator-sitting per Mrs. The Poet’s request.

Someone in front of us in line left $0.72 in the change dish at the grocery store. Since the two people in front of us paid with plastic that means it had been there for at least 4 customers counting us and the person who left it. When I pointed the change out I was asked to please remove it.

Getting the TGS2 balanced in a corner is going to involve tuning the roll stiffness so that the inside front tire lifts clear of the ground just as the limits of grip are reached, and sizing the tires so that they have the same percentage of total grip as that end of the car’s percentage of static weight.

A good chili is a fine balance between heat and flavor. Finding a perfect chili is akin to searching for a virgin among the workers in a brothel, mostly a matter of timing.

Keeping up with Trump administration scandals is causing a rise in adult-onset ADHD making those of us who always had it feel superior.

After doing the research I would not object if someone gave me a’90s era Chrysler LH series car that had a running engine and working 42le transmission for making an SCCA A-Mod Solo Racer.

There should be a reader-only app for Twitter called “Short Attention Span Theater”.

Someone wants to open a “covfefe house” in my town. I don’t know what they’re selling but you know the sign is going to have a short lifespan.

About the time my feet were recovering from whatever I did to them on that walk I dropped a heavy metal object on the toes of my left foot. Nothing is actually broken, but nothing is working right either. It’s almost as if the world will cease to exist if I’m not injured or crippled in some way.

Speaking of free car stuff if anyone over at FCA has a pentastar V6 and a 62te transmission they need to get rid of … I know this guy who’s building this car …

Again, for the people looking for bike wrecks and advice I left the archive alone, but I can’t say for sure the links are still good. If you find my sanity back there could you put it in a box and mail it to me? I would greatly appreciate it.

One of the things Mrs. the Poet likes about taking me shopping is I will find the best buy for any particular product, one of the things she doesn’t like is finding the best buys for things she doesn’t want to buy, but I do.

Do you know what rich really is? Rich is going to the grocery store and having to leave something behind because you won’t have room in the car to take it home instead of not having enough money to pay for it.

I’m looking at the rear suspension for the TGS2 and looking at the composite bellypan/splitter combination and thinking “well since I’m already making the mess…”

We’re having chicken broccoli from a frozen box over brown rice from the rice cooker/vegetable steamer and I put the chicken and broccoli in the steamer basket and the sauce on the top of the cooker to thaw and get warm and pour over the chicken and broccoli after everything’s cooked. That way the only cooking pot/device that needs cleaning is the rice cooker, that was already going to get cleaned b/c we are having brown rice. And I did all the “cooking” so Mrs. the Poet is happy which is always a good thing.

Mrs. the Poet wants some beans and rice before she leaves, so slow cooker and rice cooker next time. I’m really loving that non-stick coating on the rice cooker, it makes cleanup so much easier.

No beer this trip as the specials just didn’t tickle my fancy enough. Also not a big fan of most summertime beers. I prefer a beer I can sink my teeth into. Also what’s the deal of making “beer” with rice? That’s not beer, that’s a bad starter for sake ruined with hops.

And it has been almost a week since my last walk and now I’m really wanting to go for that walk, like really really wanting. But if I go I will aggravate my injured toes. It is a conundrum. And lazy and overfed won out over getting some exercise.

Sometimes it is hard to stop thinking about a subject

But I manage anyway. 😀 Anyway while I was out for my walk I started thinking about if I wasn’t trying to make a T-Bucket what else could I do with the engine and transmission out of a FWD minivan, and of course I started thinking AWD autocross racer because hey, turn it sideways (back to longitudinal instead of transverse) and you have a permanent transfer case with driveshafts front and rear. Or AWD T-Bucket (except the driveshafts would eliminate even the possibility of a passenger seat). One real good reason not to is weight, the extra differentials would seriously jack the weight up to about 1900 pounds for the Bucket and not far from that for the autocross racer. The other reason was how hard it would be to get a reasonable final drive with so much reduction to the driveshafts from the transmission. But it was interesting to think about.

I also thought about using different length axle shafts to make a single-seat mid-engine A-Mod autocross car. Put a 3 gallon fuel cell between the engine and driver’s seat and it could be just about the right length and balance. The trick then becomes left to right balance, getting the CG of the engine on the CL of the vehicle, and then finding or making drive shafts to fit. The wheels and tires wouldn’t be as bad because there are lots of race cars with severe rear weight bias and tire sizes to compensate for that. The closest thing to difficulty with that would be getting wheels to fit the bolt pattern of my hubs.

Anyway, I think about stuff when I walk, and that was what I was thinking about Saturday on my walk.

Opus the Unkillable