ferengi80 From United Kingdom, joined Mar 2007, 667 posts, RR: 0 Posted (7 months 6 days 12 hours ago) and read 2185 times:
Not sure if anyone saw the programme 'Plane Crash' on Channel 4 last week. If you did, what did you think?
The basic gist of the programme was that An international team of scientists, experts and elite pilots deliberately crash land a 170-seat Boeing 727 passenger jet to study the mechanics of a plane crash.
I thought it interesting, but was surprised they flew the aircraft with an empty hold. Surely if you want to recreate a realistic crash, you need to recreate the situation? I also thought it interesting that the fuselage only fractured forward of the wings. I honestly expected the rear section to sepereate as well, but this remained attached to the rest of the fuselage.
N243NW From United States of America, joined Jul 2003, 1491 posts, RR: 21 Reply 2, posted (7 months 6 days 6 hours ago) and read 2066 times:
Also, I'm sure I'm missing something by asking this, but is there any particular reason they went through all the trouble of rigging the plane up for radio control? If it were me, I'd just set the A/P for a 1500fpm descent in vertical speed mode and GTFO using the ventral stairs. Is there anything about the 727's autopilot that would prevent this?
Starlionblue From Hong Kong, joined Feb 2004, 15870 posts, RR: 66 Reply 4, posted (7 months 5 days 22 hours ago) and read 1995 times:
Quoting N243NW (Reply 2):
Also, I'm sure I'm missing something by asking this, but is there any particular reason they went through all the trouble of rigging the plane up for radio control? If it were me, I'd just set the A/P for a 1500fpm descent in vertical speed mode and GTFO using the ventral stairs. Is there anything about the 727's autopilot that would prevent this?
Safety I would guess. With radio control you can change stuff on the fly. With the A/P if something doesn't go to plan you can't change the trajectory.
"There are no stupid questions, but there are a lot of inquisitive idiots." - from Citadel by John Ringo
Jetlagged From United Kingdom, joined Jan 2005, 2452 posts, RR: 17 Reply 5, posted (7 months 4 days 17 hours ago) and read 1838 times:
Quoting Starlionblue (Reply 4): Safety I would guess. With radio control you can change stuff on the fly. With the A/P if something doesn't go to plan you can't change the trajectory.
Add to that they didn't increase rate of descent until after the pilot (and Elvis) had left the aircraft. That was tricky enough at a normal glidepath angle. Selecting -1500 fpm VS and then trying to get up the aisle to the tail to escape would have been "sporty" to say the least.
Rather than pitching down, it might have been better to reduce thrust to idle at a predetermined height calculated to result in 1500 fpm impact, and thus impacted in a more typical nose up attitude.
However what amazed me was that having spent all that money on the project they compromised it with a hobbyist style R/C set up with only 50m range. I realise using the radio inside an aircraft reduced the range but surely better equipment could have been found or perhaps external aerials rigged. They lost control before impact because of the range limitation and the aircraft hit nose first which could have compromised the result.
The glass isn't half empty, or half full, it's twice as big as it needs to be.
Litz From United States of America, joined Dec 2003, 1745 posts, RR: 0 Reply 6, posted (6 months 4 weeks 11 hours ago) and read 1432 times:
This was asked in an interview w/some of the tech crew for the experiment.
The answer given was they were not allowed to modify the aircraft (as doing so would require re-certification), so they were forced to use off-the-shelf model airplane controllers, and tape the antennas to the insides of the windows.
Jetlagged From United Kingdom, joined Jan 2005, 2452 posts, RR: 17 Reply 8, posted (6 months 3 weeks 6 days 18 hours ago) and read 1331 times:
Quoting Litz (Reply 6): The answer given was they were not allowed to modify the aircraft (as doing so would require re-certification), so they were forced to use off-the-shelf model airplane controllers, and tape the antennas to the insides of the windows.
I'm not convinced about this. After all, they modified the aircraft internally by connecting servos to the control cables. I was involved in a flight testing programme where a civil aircraft was modified for testing, including adding an external drogue and drilling holes in the radome for air data sensors. No recertification was required, but there was a requirement that the aircraft must be returned to original condition before it could go back into service.
The glass isn't half empty, or half full, it's twice as big as it needs to be.
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