Street Centerline: Fill & Download for Free

I would not use cul-de-sacs; I would employ landscaped median strips on all surface and arterial streets; and I would adjust setbacks from the street centerlines to encourage walking and bicycling ^_^

Only to the uneducated eye. Routine calculations were made using slide rules. More complex calculations, such as stress analysis, required Friden mechanical calculators. The most advanced computer available at the time was the IBM mainframe. And as you pointed out with the era of computational fluid dynamics still far in the future, aerodynamic and loads testing was limited to that performed using wind-tunnel models.It pretty much all started with SUNTAN (which if this were the late 50s you would have been one of 25 personnel that had access to this program):Take the SR-71 nose for example. The nose configuration, designed to accommodate the radar, significantly altered the Blackbird’s aerodynamics and resulted in directional stability problems. Engineers resolved the problem by adding two small ventral fins to the engine nacelles only on the SR-71B (trainers) and the single SR-71C, and a large, hydraulically powered folding ventral fin on the centerline of the aft fuselage only on the YF-12 version. Because of its size, the fuselage fin had to be folded to one side prior to takeoff and landing. The outboard portion of the wing’s leading edge had a negative conical camber that moved the center of lift inboard, to relieve loading on the nacelle carry-through structure. This also improved the maximum lift characteristics of the outboard wing at high AOA, and enhanced the airplane’s performance during crosswind landings.The nose chines were broadened to improve cruise characteristics and compensate for loss of directional stability due to the change in its length. Actually, the SR-71 used three interchangeable chined noses for the Capability Reconnaissance side-looking radar, Optical Bar Camera , and Advanced Synthetic Aperture Radar System. The CAPRE and OBC nose sections had silicone-asbestos chine panels, while the ASARS nose had a one-piece quartz/polymide radome/chine section.Do you know what was the hardest part of the build? Titanium rivets. They turned out to be among the most difficult items to manufacture.Thank goodness for wind tunnels. (oh that image was taken at NASA’s ARC facility).

It was around 3am as I headed out to do my normal grocery shopping trip. Working mostly nights, I maintain the same schedule when I'm off. It's just easier that way, rather than having to readjust my bioclock.He must've been hiding in the tailgate of my pickup, because he came out of nowhere. I pulled over into the mini-mart. It was the usual,“Sir, do you know why I stopped you?”I told him that I wasn't being coy, and I had absolutely no idea.“When you pulled out of that side street onto Street Road, you swung out wide, crossing the centerline before returning into your lane.”This wasn't anything I hadn't heard before. My wife had mentioned it on numerous occasions.I pointed across the street to the shopping center where I park my semi when I'm home, which was plainly in view. I said,“Officer, if I told you that's my truck and what I do for a living, would that explain things?”This is how I would normally make a right-hand turn, and after almost 30 years, its become second nature,Image courtesy of Drivers EdHe nodded and acknowledged that it probably would. He half apologetically explained he was just making sure that I wasn't impaired. I actually appreciated that and I told him so. Dealing with an impaired driver is an occupational hazard I would rather avoid.