PADSpot From Germany, joined Jan 2005, 1676 posts, RR: 5
Reply 5, posted (7 years 11 months 1 week 5 days ago) and read 8484 times:
Quoting DfwRevolution (Reply 4): This is an excellent video for demonstrating the torque forces of rotor-driven aircraft. Notice how the tail fractures with seemingly no outside force or contact with the water.
Sorry, but a video in which somebody dies or gets hurt seriously can't be "excellent" in any regard ...
TedTAce From , joined Dec 1969, posts, RR:
Reply 6, posted (7 years 11 months 1 week 4 days 23 hours ago) and read 8480 times:
Quoting PADSpot (Reply 5): Sorry, but a video in which somebody dies or gets hurt seriously can't be "excellent" in any regard ...
I disagree. While it's not pleasant to consider the expense of the life lost in the video, the ultimate question is how many lives might be saved as a result of this video taped death?
No deaths in this incident would tell me as a profesional in training that while the aircraft is lost, there is no personal cost to ignoring the lesson. (It would be just another moron who STP'd; who cares?)
Knowing that someone died as a result of the actions protrayed is sobering and makes for a lesson that obviously should be heeded. Allowing one's self to make the same mistake after witnessing such a video and being aware of the consequences should be something that doesn't happen.
Egronenthal From United States of America, joined Apr 2005, 54 posts, RR: 0
Reply 9, posted (7 years 11 months 1 week 4 days 16 hours ago) and read 8351 times:
Quote: This is an excellent video for demonstrating the torque forces of rotor-driven aircraft. Notice how the tail fractures with seemingly no outside force or contact with the water.
The tail rotor drive shaft failed because it is mechanically geared to the main rotor through the transmission gearbox. This is common practice in helicopters to provide some tail rotor drive from the main rotor, and thus directional control, even when the engines have died. Hopefully the pilot can enter autorotation after engine failure, where the main rotor is driven by aerodynamic forces. The tail rotor will then be driven off the main rotor, and provide enough directional control to land relatively softly.
In this crash, when the main rotor instantaneously slowed greatly or even stopped rotating, due to contact of the main rotor blade tips with the water, the tail rotor continued to turn because of its own rotational inertia. The tail rotor drive shaft was then faced with zero or near-zero rotation at one end (the main rotor transmission) and near-normal rotation at the other (tail rotor) end. The overloaded drive shaft simply shattered under the load, as spectacularly shown in the crash video.