Daily Archives: May 21, 2017

Still thinking

One of the things that has been gnawing on me a little is I missed another Ride of Silence this year. For those new to my blog since I dropped the bike wrecks click on the tag RoS or Ride of Silence to see previous posts about it. I started missing the RoS when the tumor on my neck got so big that I couldn’t ride any bikes. But after Chris Christie was removed from my neck I got to the point I could ride bikes with a very upright riding position or recumbents, but not very far. Well now I can’t ride anything except a bus or car because Arthur Dent is causing troubles. I have a pain that starts in the middle of the dent and radiates to the end of the trapezius in one direction and up the back of my neck in the other, and makes my deltoid and rotator cuff tingle like they are trying to go to sleep. It’s very annoying but not much of an impediment except to bike riding at the moment, but it feels like it is trying to get worse.

I’m stalled on the Mid-Bucket (aka the Thunderbolt Grease Slapper 2) ATM because I lack cash for parts or raw stock. I still haven’t replaced my ID since the last time I lost my wallet, because I needed my ATM card to get the cash to pay for it. ATM card should finally get here this week and I will renew my ID early so I can go to Nashville and see the eclipse this August. When I get stalled on one project my mind starts on a new project immediately, in this case a lighter weight version of the Sprint-T with the Pentastar V6. Basically it is just the same as the V8 version with lighter components because of less weight and lower power. Remember the vicious circle of too heavy so other parts have to be stronger and heavier making the car heavier so other things need to be stronger…? Well this is the benign circle of less weight allowing for less heavy supporting and connecting parts. And the weight came to under 1400 pounds with the balance almost 50-50 I can use all the same size wheels and tires on each corner. If I could have gotten one of those free things would have been a lot easier.

Pole Day for the Indy 500 is on the idiot box so this is time to wrap this up. Congrats to Kyle Busch on winning the All-Star race last night in a masterful performance. Condolences to Sebastien Bourdais on that wreck at Indy yesterday and wishes for a quick recovery.

Opus the Unkillable

My biggest impediment is my sense of esthetics

My main guide to engineering is the math, but after that is my sense of engineering esthetics. And sometimes that gets in the way of finishing a design. Seriously, the single 3″ tube would have worked fine for the de Dion suspension, but a truss would weigh less and be stiffer, by a small amount on both counts. And the new truss is much simpler both to build and to mount than the previous truss of 0.5″ thinwall tubing with a plethora of tiny triangles in two planes as it is just 7, 1.5″ X 0.120 wall round tubes in a single plane. The tube diameter and wall thickness are enough to hold the toe and camber alignment while the truss is strong enough to take all the vertical and horizontal forces with a huge safety margin. The truss weighs 20 pounds with brackets, not including the filler wire from the welds. This compares to the 3″ tube which comes to exactly the same weight but not as stiff vertically. Or as pretty to look at, which as I wrote earlier is an equal criteria after weight.

I mean face it, the 3″ tube would work just fine and probably less than 3 people out of 100 would be able to feel the difference in stiffness compared to the truss. Even fewer than that would care about the looks of the truss compared to the single tube. TBH even I am just the slightest bit ambivalent about the difference in appearance between the truss and the single tube. There is the simplicity of the single tube across the back of the car, but on the other hand there is the zen-ness of the collection of triangles running across the back of the car, even if it is hidden by the bodywork for aerodynamic reasons. There is also the fact that I can lower the roll center by almost 2″ in the rear to reduce oversteer slightly with the truss. And finally there is the cost issue, a single 58″ 3″ X 0.120 wall tube is less than half the price of the 132″ of 1″ X 0.120 I would need for the truss.

And even while I’m thinking about the rear suspension I’m still thinking about the cockpit and a possible roof and side windows. Mrs. the Poet is still saying there is no way I’m going to be able to get in and out going through the top of the roll cage after climbing the side of the frame. I have zero doubts about getting in and out of my own car, if for no other reason than I will have lots of time to use the frame as exercise gear to get my upper body strength up. Or I could screw together some black pipe for a dipping rig and chinup bar and continuously build my upper body every day. 😀

And I think I need to go to bed now, and so become the Nighty Knight.