Just watched Scott Manley's "Shuttle landing" video. https://youtu.be/pfNQW4jToHE
I was always told the Shuttle had the flying properties of a brick.
Yet, Enterprise had problems landing a couple of times since it still
created lift and stayed up longer than expected on the sand sunway.
The video susprised me because I truly expected it to firmly touch
ground with no ability to hover.
I believe the strong ground effect created by the large flat bottom of
the shuttle had a part in these initial difficulties?
On 2021-10-09 09:30, Otto J. Makela wrote:
I believe the strong ground effect created by the large flat bottom of
the shuttle had a part in these initial difficulties?
That makes sense I guess. i was just very surprised to see that shuttle actually gain a few feet and stay up for an eternety (a few seconds).
My "image" of the shuttle is that there was no way for it to do this and
the main gear HAD to fall to the ground, abd the only control they had
was keeping nose up to bleed speed before lowering it.
Perhaps they changed the approach to ensure the shuttle had lower
airspeed at the runway which would explain the "main gear must fall to
the ground" while in early tests, a higher speed allowed that ground
effect "flight".
In the video, Scott Manley clearly explains that the bouncy landing was
due to pilot-induced oscillation (PIO) through the fly-by-wire system,
and that it was fixed by correcting the fly-by-wire control algorithms.
On 2021-10-10 05:29, Niklas Holsti wrote:
In the video, Scott Manley clearly explains that the bouncy landing was
due to pilot-induced oscillation (PIO) through the fly-by-wire system,
and that it was fixed by correcting the fly-by-wire control algorithms.
Yes. but that means that the Shuttle still had enough energy and "lift"
to not only be able to stop its descent but rise a few feet and stay up
for some time. (as opposed to the saying that it had the flying
capabilities of a brick (which can only go down).
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