Tag Archives: frame rails

Chafing with antici.. wait for it, wait for it… pation

I’m getting tired of waiting. I want “Chris Christie” off my neck. I got tired of the “ugly lump of useless fat that is a pain in the neck” months ago, now I’m tired of waiting for it to be gone. I started this trip back in June 2014, when I was for sure I had health insurance (I had to fill a prescription for antibiotics and presented my insurance card and got $50 worth for like $4) and it took until now to get scheduled. Now I just have to wait until there is a free spot in the OR.

I’m still working on the Sprint T, mostly as a distraction from waiting to get my neck sliced open. I used a hunk of tubing from a bike project that got stalled when my source for another size of tubing I needed to complete the project went out of business to plot where I would put the body mounts. The tubing is not the same size as the frame rail it represents, but I was able to get a good idea of where the mounts will go under the body. The manual for Speedway’s kit that uses the same body suggests 6 mounts, 3 to a side. I can get to the far corners of the mounting flange and keep the frame rail under the body, and also for the middle of the body so I’m good to go on that front. I also go one up on the Speedway kit by putting the mount directly to the body instead of through the plywood floor that is glued to the body. You can see roughly where the mounts will go by looking at this picture.

The front mount will go right behind where the front of the body is resting on the floor about 3/4” from the outside and front edges, the rear mount will go about even with the back edge of the floor cutout in the body and likewise 3/4” from the outside edge of the body, and the middle mount will go on the line connecting those two about the middle of that run. I wish Chrome had a decent photo editor so I could make those marks and lines and show you where the mounts will be rather than just telling you.

There is a method to my madness in this. I’m trying to simplify the frame construction as well as knock as much weight off the build as possible. So, I’m changing the frame design again so that I have 3 distinct sections that can be built independently of each other so I am not filling my entire workspace with the full length of the frame all at once. The front part of the frame, the part where the engine goes and the front suspension is attached, is two parallel rails on the bottom with a front and rear tubular bulkhead and a diagonal from the top of the front bulkhead to the bottom of the rear bulkhead. The top of the rear bulkhead and the top of the front bulkhead are connected by the upper frame rail when the front clip gets welded to the passenger compartment section. The rear part of the frame is also two parallel rails on the bottom, with a front and rear vertical bulkhead made from a tube structure braced with a sheetmetal diaphragm, and an upper frame rail made from the same material as the lower connecting the two bulkheads and likewise sheetmetal used to brace that assembly as the rear of the frame makes the trunk/fuel cell container completely separated from the passenger compartment. Those two assemblies define the width of the frame where they meet the rest of the frame. The rear bulkhead of the engine compartment is also the front hoop of the roll cage that defines the upper frame rail, and the rear hoop is mounted to the part of the frame that connects the front and rear clips together and runs under the body. The real fun part is the entire roll cage runs outside the body to protect the driver and any passenger that might be unlucky enough to be on board in a wreck, and as I wrote earlier use the largest possible dimensions for the frame to use the d4 principle to make the frame torsionally stiff. And this means I will have to figure out a way to get the body inside the frame after it gets finish welded and everything painted without having to cut any diagonal braces or scratch any paint. I think maybe I should build a couple of “ship in a bottle” models to get ready for this. The old style, where the ship was built except for the rigging outside the bottle and then rigged inside the bottle.

Actually, I’m thinking that the diagonal braces inside the body are going to have to be bolt-ins that are installed after the body gets finally installed through the side or top of the frame. If I have to go through the top that means the top braces are going to have to be bolt-in as well, so I might just make the whole mess bolt in as a single unit if it makes it any easier to do. Or not. 😮

PSA, Opus

Contemplating my options on a Wreck-Free Sunday

At this point I still Haven’t been contacted by the surgeon who will handle my case, so I don’t know when I get cut open. I only know I will get cut open and that ugly hunk of fat removed at some time in the near future. What happens after that depends on the report from the lab. If “atypical” means “funny looking but otherwise normal” that’s where the story ends. I get sewed up and go on about my business. If “atypical” means something else then other things will happen while I’m still out on the table. Exactly what depends on what they find at the lab, but having communicated with other people who have had a similar experience the most likely situation is if “atypical” means “cancer” they will biopsy the lymph nodes in my right armpit (the closest to the lump) to see if the cancer has spread. If that comes back clean then chemo to get anything that escaped during the surgery. If there are cancer cells in the lymph nodes then things get complicated… And I won’t know the options for that until my consult with the surgeon.

So, when faced with possible mortality, what do I do? Well, I go back to working on the Sprint T’s frame design, because there are things I still don’t like about previous iterations. Specifically I didn’t like the overlap between the engine compartment frame rails and the extension of the passenger compartment frame rails. Also I looked up the dimensions of the rear axle I wanted to use and there was no way it would fit in any of the previous versions of the frame without cutting a divot out of the middle of the gas tank or dividing the gas tank into two parts with the protruding part of the rear axle between them. So this version would have to be longer behind the axle centerline than any of the previous versions by a large chunk of frame rail. Now as to why this was important, the passenger compartment frame rails are going to be 0.120″ wall 1.5″ square tubing, while the engine compartment and the trunk/fuel cell compartments are only 0.060″ wall so they are lighter and more importantly will crumple in a wreck and not transfer impact to the passenger compartment. Well in previous versions the 0.120″ wall overlapped the engine compartment frame rails by more than a foot (305mm) which will seriously compromise the crumple of the engine compartment. The desired failure mode is for the engine compartment is for the upper frame rail to buckle and the bottom frame rail to fold up at the firewall and direct the mass of the engine and transmission under the passenger compartment, away from the driver and passenger.

And while I’m talking about impending mortality, I’m reminded that I have been through this death thing once already. There are even categories of how dead you were before you get revived, or in my case reboot. Book 16: Big, Dumb Objects Part I I think I was just at the threshold of “Laz-1”. I didn’t get shot, the projectile was more about massive blunt force trauma, than penetration. But I still died for two minutes before “rebooting” myself.

And I have run out of things to say so I will stop writing.

PSA, Opus the unkillable badass Poet