4 ms·
Good story. I think this line was the most surprising to me: > The SR-71 had a turning radius of about 100 mi. at that speed and altitude
by munchler 4y ago
Good story. I think this line was the most surprising to me:
> The SR-71 had a turning radius of about 100 mi. at that speed and altitude
- s1artibartfast 4y agoKeep in mind it is traveling at 2,200 MPH so it both has an immense amount of inertia, and also travels through that turn faster than it might sound. At speed, that is about 4 minutes to make a 90 degree turn, traveling an arc length of 160 miles.
- dredmorbius 4y agoI suspect the minimum turn radius is also g-limited. If I'm using this calculator right, at 2,200 mph (~1,000 m/s) and 100 mi (161,000 m), the aircraft, and pilots, are experiencing 6Gs of acceleration. The airframe could probably handle more. Pilots probably not, especially for a sustained maneuver. https://www.engineersedge.com/physics/centrifugal_force.htm https://www.engineersedge.com/physics/centrifugal_force.htm
- gshubert17 4y agoUsing 2200 mph (not 22,000) I get about 0.6 g acceleration. What surprised me is that to do a 180 would take 314 miles / 36 miles per minute or 8.5 minutes.
- dredmorbius 4y agoWups. I'd misplaced a comma & added a zero. 1,000 m/s ~= 2,200 mph, and that's what I'd used in calculating. That said, I'm still not sure I'm using the calculator correctly, though I've checked against a few alternate methods and designs (e.g., the Stanford Torus, at 1.8 km / 1 RPM) and results check out.
- s1artibartfast 4y agoI think we're saying the same thing. Inertia and G forces are coupled
- dredmorbius 4y agoI'm quantifying how much that coupling amounts to. (I'm not sure I'm doing my maths correctly, mind.)