One G rolls: a physicist's view

"Kyle Boatright" wrote:


Good analysis. One thing you might try is running the model again at 6 or 8
seconds to complete the roll? This would be would be representative for many
GA aircraft, which have roll rates of ~45 degrees/second? I imagine it
would make a huge difference in the vertical velocity at the end of the
roll.

That was my gut reaction, too, but it is proportional, 1 g downward
for the duration of the roll. So a 10 second roll would end up with a
final downward velocity of 32 ft/sec^2 x 10 sec = 320 ft/sec.

Of course, that is added to the upward velocity at the begriming. So
if you are on a 20=degree upslope at 150mph, and roll at 1 g for 6
seconds, the final downward velocity will be 192ft/sec - initial
upward velocity of 150 mph *sin(20) * 1.46 ft/sec / mph =
192-75=117ft/sec, still a pretty steep dive. But in your RV-6, you
roll faster than that, don't you? If 4 seconds and 130 mph, that would
convert your 20-degree climb into a 20-degree dive.
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