Daily Archives: May 10, 2017

Design is getting down to brass tacks

That is a very archaic turn of phrase in the headline, it means discussing the ornamentation on a custom saddle and dates from at least as far back as the 17th century. Today it means getting to the fine details of a deal or design. As of this point the front end is approaching brass tack territory.

I went back to earlier drawings of the front end and found a couple that placed the crossmember above the front axle, but not as high as the one I discussed yesterday. So I went back to that and moved it higher, and also added the radiator mounts and body supports in front and hung the rack off the backside. I dropped the MD3 nose from the design in favor of making less drag and downforce with a nose made from the same HDPE panels the rest of the body is going to be made from. The right side of the rack might protrude from the body at full left lock but I don’t care at this point. That is a minor aesthetic point that is overridden by making the damned thing work right. There is nothing for it to interfere with on that side.

At this point I have started thinking about the cockpit design, specifically protecting the instrument cluster from the environment while parked outside, and making the cockpit tolerable at highway speed. Putting a roof on took care of most of protecting the instruments from condensation, rain, and bird poop. Further enclosing the environment with some kind of side windows will do a better job of preventing condensation and blown rain from getting to the instruments. I don’t know if that would be enough to allow driving in the rain, but it will probably do a lot for making the interior livable at highway speeds by reducing cockpit wind and turbulence. The original cockpit had no windshield or side windows with the driver wearing a helmet with a face shield all the time, even on the street. That was back when the car had a V8 in the front and the driver sitting on the left side of the cockpit. Now I’m even thinking about heat and AC 😇. There are races in FL during the winter that might be fun to run in, which means driving in winter, which means a heater. Driving in the rain means a fogged windshield which means a defogger which means AC of some kind.

I even looked up what sender to use on the gas tank so the gas gauge works right (10-90 ohm). Really this started when I discovered the entire instrument cluster came out as a unit. And that the engine and transmission controllers expected to find the instrument cluster before they would let the car run. Since I need a tach and speedometer and the computers know how to use the ones in the cluster and everything will need to be “unconfused” L8r, why not use the OE cluster? It saves having to buy those instruments later and figuring out how to make everything work together which is even a bigger hassle than telling the computer it isn’t in a minivan any more.

And now it is about time for my walk, so more thinking about random things.

Opus the Unkillable

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