Yes I was being dangerous again, thinking and all. Basically I’m thinking about details now, how to arrange the heim joints on the plate so they don’t interfere with other bits and are still adjustable for what needs to be adjusted.
My first thoughts were they needed to be set up in an equilateral triangle with one located center bottom. Then I ran some adjustments in my mental model in that configuration and there too many interactions in that configuration. What it came down to was every adjustment would change another parameter that did not need changing (or maybe it did but not at the same time and maybe not in that direction). So, change to a right triangle with the sides adjacent to the right angle located vertical and horizontal. Changing the camber will change the toe slightly but changing the toe doesn’t affect the camber. The longer the distance between the vertical pair of heims and the toe heim the less a camber change would change the toe. Thinking about it more putting the toe heim on the horizontal centerline of the rear axle with the camber heims equally spaced in relation to that line would give the least toe change with camber adjustments, especially if the camber heims were adjusted in equal and opposite directions. So, maybe not equilateral, but isosceles with the point on the horizontal center of the axle and the short side vertical.
Now that that part is decided how to connect it to the de Dion truss? The reason the equilateral triangle first suggested itself was using the horizontal part of the truss to support two of the joints and a side support off the vertical for the third. And as I think about it I can get zero interaction with the right triangle by leaving one joint fixed, and adjusting the other two for toe or camber, depending on which axis they are on. Which tells me that the horizontal pair mount to the horizontal truss, and the vertical pair the vertical, and the heim that is on both axis is the fixed one.
See how problems can be solved if you just put them in words while thinking in 3 dimensions? I know, not everyone can do that, I have what amounts to a 3D CAD program in my head. What frustrates me is I can’t just copy and paste from my head to my computer like I do when I write stuff on my phone. I mean I can see it perfectly, but I can’t reach in and pull what I see in my head out where everyone else can see it, and I lack the skills to enter what I see into a real CAD program, and the patience to learn how. I know, that last one is on me, my problem. But I can even see how the flanges for the various heims interact to add support to the mount for the hub bearing with minimal added weight. Just connect them around the bolt pattern for the hub bearing and they have enough vertical depth to keep the mount from flexing. I just need to leave enough room for the bolt heads and a socket to drive them into the holes on the flange on the hub bearing. All the major forces go directly into that hub mount, bypassing the de Dion truss which has been reduced to keeping the wheels pointed in the right directions on two axis and the same distance apart all the time.
Speaking of the same distance apart, it looks like this is gonna be a very wide bucket, about 6′ 3″. The front axle is going to be 56.5″ wide compared to the usual 48″. That’s because the hub-to-hub width on the donor vehicle is right at 65″± compared to 56″± for the usual hot rod axles. This solves a lot of problems with the suspension, while introducing others. But mostly it solves problems or makes them tiny. And tiny problems are either easily solved or ignored.
And on that note it’s time to say buh-bye until next time. Opus the Unkillable
And what I was thinking about this time was how to make the Mid-Bucket lighter and stronger. And I was thinking that I could make the rear suspension lighter if I didn’t have to make up brackets for these.
when all I really need is one of these on each side.
And then I got to thinking that I could use the flat brackets for the e-brake calipers and rotors in
this kit or just cut the bracket into the mount for the hub to save (even more) weight. But going to this will remove a lot of weight from the de Dion truss, because the adapter for the knuckle weighs about the same as mounting everything directly to the plate without the knuckle, saving the weight of the knuckle casting.
The fly in the ointment is the detail design for adjusting the camber, caster, and toe angle without the knuckle to use for pivoting on, but while I was typing that I came up with a provisional solution using a heim joint… so that’s good, I hope.
Anyway, the reason for the walk is the AC in my office is on the fritz and it got up to over 80 in there which slows the laptop down to practically nothing, and I have this Starbucks app with lots of $$ loaded into it. So, take a walk and get a cold coffee drink and pick up my bag limit on the game that pays me money to play. Mission accomplished, drink purchased, and bag limit achieved. And I got some exercise to go with it.
So, y’all have a good night or day depending on when you read this, and I’ll write more later. And there is a new story page up, check out the list under the banner.
Billed @€0.02, Opus the Unkillable
Earlier this week I was too busy doing things to write a blog post. Now I have a few minutes to write what happened. All I need to do is get the story straight in my head so I can put it on the screen. That is easier said than done.
Big news first, I lost my wallet again. Exact same way I lost it last time, from the same pair of shorts. I thought I was putting the wallet into the pocket, but it didn’t stay there. I probably lost it when I was sitting down after buying the day pass on the first bus of the day.
Second thing is I am no longer hairy. Well as hairy. I used a ½” guard on the top of my head and no guard at all on the beard. Then I charged up the electric razor and finished off the beard. Voila semi-fuzzy.
On the Mini Sprint-T, I think I have my tire mounting problems solved. I mentioned in an earlier post that I would be using a discarded insulin syringe to inflate the tire out to the edge of the wheel, well the other problem is the wheel making the tire grow larger in diameter by a substantial amount because it’s just too thick, for structural reasons. The resin used to cast the wheels is not as strong as the styrene plastic used in commercial model kits so it has to be thicker, basically all the way out to the flange diameter of the wheel. This in turn stretches the tire diameter by a similar amount, which drastically alters the scale relationship of the tire to the rest of the car. Well I’m going to try sanding out the inside of the tire bead so the oversize wheel so it doesn’t force the tire larger and see how that works. I have a spare set of wheels, and tires that I won’t be using on either model, to experiment with.
And I’m starting to get fuzzy around the edges of my mind, so I’m quitting while I can still hit the correct keys on the laptop.
Bille @€0.02, Opus the Unkillable but sleepy
Mrs. the Poet has been complaining about how I’m “not helping” her throw away my stuff when she does it during the part of the day when I’m still asleep. I don’t understand this. I don’t complain that she’s not helping me write when I start composing stuff at 0300 when the Internet is fastest locally and I can get to reference materials most quickly.
So we reached a compromise, in that Mrs. the Poet will not start throwing my stuff away until I get up, and because we both have things to do over the weekend I will start helping her on Monday afternoon after I have had coffee. There is something in the garage that she calls a “box full of rusty metal stuff” that I’m almost afraid to open. Then we don’t go into the garage again until after I get up Friday.
On other things I’m playing some more Shadowrun tomorrow, and there is a late race on Sunday, the Las Vegas race for the Monster Energy NASCAR Cup. And now that I have a new tube of GOOP™ I can continue to mock up the Mini Sprint-T street version. I haven’t found a model kit that has the Pentastar V6 as an option so kitbashing is right out. But I have that first wheel glued up and ready to test fit to the tire when the glue dries. I’ll probably do that Sunday while I’m watching the race during commercials.
Billed @€0.02 Opus the Unkillable
Posted in Daily Feed, Department of DIY
Tagged conflict, Life, making model cars, Mini Sprint-T, model cars seldom kill people, Monster Energy NASCAR Cup, Mrs. the Poet, Pentastar V6, race, Sprint-T, unkillable badass
I was on a long walk to get some stuff at the hardware, and well, my mind also wandered. Specifically it wandered around the Sprint-T. What I was thinking about was what it could be like with the Pentastar 3.6l V6 DOHC aluminum block and heads engine that weighs a factory-claimed 326 pounds (as compared to the 545 claimed for the SBC and the 413 for the 3.8 pushrod engine out of the minivan) and delivers 305 HP in stock form. As a comparison the “performance” SBC in the first-gen Camaro was rated at 290 HP. In the Sprint T with the SBC and a TH 350 transmission I was looking at just over 1700 pounds empty, with the Pentastar V6 and the 42RE transmission coming in at 1450 pounds but that 42RE transmission would be dicey for racing use. The later models used 6 and 8 speed slush boxen that would survive racing but also weigh considerably more, the 8-speed being strong enough for the legendary Hemi. The transverse version of the 3.6 would bolt to the 41TE transaxle in the mid-Bucket and take 87 pounds off the weight and rear axle, while adding more than 200 HP over the engine as it sits in the minivan. Do I want one? Not if I had to buy it from the dealer with a car around it. Would I take a similar deal as I got on the 3.8l pushrod engine, remove a derelict vehicle to remove the stuff I needed to make a car for free? Hell I would even pay for a car that got wrecked in the back as long as it wasn’t more than $1K to get the 305 HP version of the engine and then swap the FEAD (Front End Accessory Drive) for the transverse installation. I mean 200 HP more and 87 pounds less would I take that? Hell Yes I Would Take That!
So the reason for the walk was to get the 7/32” drill bit and the small tube of GOOP for the bike and Mini Sprint-T respectively. I logged 3.93 miles and 25 checkins on Map My Walk and M Plus Places respectively and burned a lot of calories in the process. The weather was perfect, just warm enough and just breezy enough with a high overcast so that it was bright but not blinding.
And I have to get the rest of the stuff I do offline done so I can go to bed, so I’m putting this post to bed first, then me.
Billed @€0.02, Opus the Unkillable
I had a hard time getting out of the house for the trip to the LRK because Clint was “helping” me get dressed and out the door then decided he wanted back in right after I locked the door on my way out. I was on the wrong side of the street when the bus went by while I was trying to get across. That led to me walking about a mile and a half to catch the crosstown bus I wanted to catch at the station, after it was already en route. I got there in time and I even managed to check in to a bonus check-in 4 times while I was going to and from the LRK and breakfast.
So anyway, I was supposed to catch the bus that went by the main road at 0658 so I got up at 0600 to shower and dress and leave in time to catch the bus, but between Clint “helping” me get dressed and his deciding to turn around right after I locked the door I got going 5 minutes later than planned, resulting in my watching the bus go by from the wrong side of the street instead of riding it to the transit station for the crosstown bus. So I hoofed it to the bus stop where the crosstown bus turned on Beltline about another mile and a half from that stop. Then I sat and waited a few minutes for the bus and for my left foot to stop hurting. Part of the reason I missed the bus is my normal bed time is 0400 or so, usually later rather than earlier, and I get up about 1200 or 1300 instead of 0600. This meant I was running on very little sleep which means I was running slow, and still am. I have caffeinated to the limits, but I’m still having problems putting two coherent sentnces together in a row.
I’m gonna take that as a sign to hang it up and hit the sack.
Billed @€0.02, Opus the Unkillable
OK I did my toes yesterday and picked up my meds. The toes were the same cost as usual, but my meds went up almost 500%, 471% to be precise. My usual pharmacy changed suppliers on this med and where the old supplier had a discount for monthly prescriptions the new one doesn’t. The new pill looks completely different in shape and color from the previous one. While I was going down the road I went ahead and got my bag limit for check-ins on my phone game, which is also working like it’s supposed to work. I just cashed in the gift card I earned last week and I’m close to getting another gift card on the side quest mission, just two more days to go on that one.
On the Mini Sprint-T I have been playing with the windshield frame from the donor kit to see if I can make it lay down like mine will with the posts I got from Speedway . Short answer: Yes indeedy. Unfortunately it takes both hands to hold the frame aligned with the body without using glue and since my mockup adhesive has gone walkabout I can’t put it together to take a picture. Since I have to visit the LRK early in the AM I’ll stop by the hardware and pick up another tube of Goop and some drill bits to install the tail light on the seat of the new bike. The mounting bolt measures 3/16” so that’s the drill I’ll be looking for or maybe a thirty-second larger.
Well, I have to get up at Oh-Gawd-Thirty in the Aye-Emm so I’m going to let it rest now.
Billed @€0.02, Opus the Unkillable
Things have been good this weekend around Casa de El Poeta. The lady my wife is helping unpack and downsize had an extra wheelchair seat cushion that I’m now parking my butt on in my office chair, and it’s super comfy. Now I don’t know if there was an extra cushion because she’s no longer using a wheelchair, or if she somehow had more than one cushion. Doesn’t matter, I have a comfy place to park my butt for writing and reading stuff on my computer.
Mrs. the Poet woke up with a sore leg today so we are skipping church. There is about 0.8 mile (1.3 Km) walk from the transit station to the church with no bus service on Sunday so that bus stop in front of the church is of no use to actually get to church on Sunday. Mrs. the Poet feels her leg will not make that walk without either a lot of pain or the leg actually quitting. I’m familiar with a leg that fails to function, the nerve damage I got in the wreck does that to me sometimes even this far out from the wreck. The difference between Mrs. the Poet’s situation and mine is we have opposite legs failing on us, and she has a back injury causing her issues.
On the hot rod front it looks like I will need to install a front anti-roll bar to get as much oversteer out of the car as possible. That’s from running the numbers through the equations in the Herb Adams Chassis Engineering book on weight distribution and cornering weight transfer. I can’t calculate the exact size bar I will need to install from that book, but I can determine that I will need to use one. The other thing I will need to do is lower the rear roll center to tighten the rear grip geometrically. Since I have already determined that I’m going to mount the lateral locating device as low as possible on the rear this is not news to me. The current plan is to make the street setting about 7″ below axle center and move it up as required for autocross racing at Goodguys or SCCA. The limit is when the front end is transferring all the weight from the inside to the outside tire and the inside front tire lifts off the ground. At that point if the car is still oversteering there ain’t nothing that can be done by making adjustments to weight transfer. The only thing to do would be going to bigs and littles on the tires with the bigs holding up the back end because more tire = more grip. Bigs and littles is a traditional combination for T Buckets because the traditional geometry has the rear roll center anywhere from 5 to 7 inches above the axle centerline where I’m building a much lower rear roll center to keep the tires as equal as possible.
On other things I need to get my toes done tomorrow. I said this before but the nerve damage in my left leg keeps me from being able to trim the pinky toe and the next toe over by myself because I run out of hands. Those two toes curl under when I’m doubled up to reach my toes and it takes two hands to pull the toes out and hold the foot down leaving me one hand short to trim the nails. I would prefer to not spend the $$ and trim my own nails but conditions dictate otherwise. While I’m in the area I will pop over to the pharmacy in the same complex and renew my antidepressant prescription, and get a few things we missed yesterday rushing through the store.
The Monster Energy NASCAR Cup race at Atlanta is just ending and Kevin Harvick lost the lead on a speeding penalty, leaving Keselowski free to take the win.
And I need to get ready for the many things I need to do tomorrow.
Billed @€0.02, Opus the Unkillable
While I was out walking and looking for Clint Sunday night I heard him answer back from inside the neighbors’ fence. Unfortunately they were asleep at the time so I couldn’t ask to open the gate and let him out, and then it started raining. It wasn’t until I got back from my walk yesterday evening that I was able to get someone next door to talk to me and open the gate. When they finally did get the gate open Clint burst out of where he had been hiding and out the gate and didn’t quit until he got to the front door. I spent the next several hours being loved on and repeatedly invoking the “no claws clause” because Clint was just ecstatic about being back with me and back inside where it didn’t rain and wasn’t muddy. It took until this afternoon for him to finish getting the mud out of his fur, but he’s clean(-ish) now.
On the lab-rat front, I’m working again on a new study. This time I’ll be taking an approved drug to see if it works for another condition. I have hypertension combined with left atrial hypertrophy, or in simpler terms an enlarged heart. Mine is benign because I got it from extended periods of moderate aerobic exercise (I rode my bike a lot). Anywho it means that I can sell plasma while I’m on the study since this time they are testing an approved drug. That means I will be able to buy some parts for the hot rod, probably the Watt’s link since it’s one of the cheaper parts and it doesn’t have to be custom ordered to fit the car. When I get a good measurement on the face-to-face distance of the minivan suspension in its stock form I will be able to order the right width front axle since custom widths are only $25 more than in-stock. I can’t say any more about the study because of the NDA.
And I just lost about 20 minutes writing time because of the cat on my lap giving me kisses (with tongue! 😛 ). I am still his Most Favorite Person In The Whole World, even more now that I rescued him from the neighbor’s back yard and their cat-proof fence. And it is nice having some
onething to cuddle with for a while.
After the cuddle break and dinner I decided I needed some time to work on something, anything, and I had a flat file and some too-wide wheel halves for the Mini Sprint-T. Turns out the file works just as well as the sandpaper I was thinking about using to narrow the rim half and get the width right for the street wheels. Now I just need to figure out how I’m going to get the bead of the tire out to the bead seat of the wheel. I have lots of insulin-dependant friends who go through tons of syringes with hair-fine needles in a month, that would be great for moving a tire out on a rim by inflation until the glue dries enough to hold them in place. [Evil Thought] Or I could get some expand-in-place foam and squirt the precise volume of chemicals needed to fill the tire cavity to push the bead out and keep it out. [/Evil Thought] Anyway a few minutes of work gave me a wheel that is the right width for the street version of the Mini Sprint-T, but I have to be careful because of how easy it is to go overboard with the file and take off too much material. Fortunately I have some extra wheel front halves because I’m just going to use the centers from them on some much wider shells.
Time to go take care of other things.
Billed @€0.02, Opus the Unkillable
Clint decided to spend the night out last night. He insisted he had to go outside yesterday, then just never showed up when it came time for bed. It has now been over 24 hours since he has eaten here, and he has never been out that long. Needless to say I’m worried for him.
I have been hearing lots of predators in the area, owls, coyotes and I have seen some bobcats while on my walks. Clint might be effective at accidentally clawing my arm but with all the fights he has lost with the local squirrels biting his tail… I’m not sanguine about his condition.
While I’m composing this the pole qualifying for the Daytona 500 is/was on the TV. Junior will be starting alongside repeat pole winner Chase Elliott on the front row for the Daytona 500 Monster Energy NASCAR Cup series race (got to get the full name in there 🙂 )
On other things Mrs. the Poet has thrown away more of my stuff in the process of making enough room for my hot rod in the garage. 😢 I can actually see all the way across the garage in several places now. I still haven’t found that book with the equations for getting the spring rates right on the first try that I bought back in the early ’80s when I first started building cars and haven’t seen in years, since before I blew the engine in my last car in 1995. I remember packing it for the move to Casa de El Poeta in 1994 and as far as I remember that was the last I saw of it. I remember it had a black cover and was written by Len Terry or had an ad for the Terry book as an additional resource. It had a black slip cover with white line illustrations and I think red text. I searched the web and…
That’s the exact edition I’m looking for, because I already own it! OK I had the colors on the illustrations and text reversed but otherwise, that’s what my book looks like. In that book are the equations I need to select the right springs and shocks on the first try, and a bunch of other things, too. Since I don’t have the room to work yet, and Mrs. the Poet throwing away my stuff is limited by the volume of the garbage and recycle bins and how often they are emptied. Which means that instead of getting the trauma over with quickly, the suffering is stretched out for weeks.
Speaking of suffering, this post has gone on long enough. My cat is still wandering around outside, and Mrs. the Poet is still plotting throwing away more of my stuff, and I’m still stressin’.
PSA, Opus the Unkillable