I"ve seen the SR-71 at a couple of museums.....very impressive. I remember the narrator talking about how it "stretches" in flight due to heat,....leaks on the ground. (like in the story below). Wondering if that aircraft was the one with the rear view mirror, outside of the cockpit? I think it was used to check the afterburner? Interesting to find out in this story that it can fly in a stable manner at 156 knots. Cuz as a paratrooper, I had numerous jumps out of a C130 at 140 knots......about 160 mph. I remember when the AF started using the C141 Starlifter, trying to safely jump under 200 mph. Had to add to the static line so jet heat wouldn"t melt the line......circa mid 60s. Joked about the drop zone would be from Alabama to Mississippi! But, hey, we always enjoyed that Southern Hospitality- wherever we landed!
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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