I'm assuming that it was in case he lifted it clear of the support structure and then dropped it. They could snatch the collective up under their armpit and fly away instead of rolling a very expensive helicopter onto the ground.
And it is no doubt true that with the rotor running in the green arc and even with the pitch bottomed, it would lift a little bit of the weight. You might not notice that amount if one ever lands on your toe.
Quoting Newark777 (Reply 4): Anyway, if you follow the laws of physics, he didn't do any work holding that up.
I first heard this idea from a high school science teacher. Even at the time I thought that he may be technically correct but as a practical matter the statement is utter crap. If the definition of work must include motion then we seriousy need to redefine work when it comes to humans and animals. Preventing motion requires effort just as causing motion does, else your car's brakes would never need replacing.
It is true that metal struts under that helicopter are not doing "work" but they are carrying a load and energy, at least "potential" energy is stored in them during the period the load is applied. For a person holding that load, unless you lock your knees over center you are going to have to exert muscle energy to keeping your knees from buckling. If you do lock your knees over center you run the risk of hyperextending them and (this is too ugly to think about!) bending them the wrong way unless you lock your muscles. Unless you really love chiropractors or pain-killing drugs you are also going to carry the load with the muscles of your torso and not the cartilege between your vertebra.
Holding up the weight of a helicopter (a BARBell?) may not be a good aerobic workout but expect to use a muscle or two.
Happiness is not seeing another trite Ste. Maarten photo all week long.
HAWK21M From India, joined Jan 2001, 31775 posts, RR: 55
Reply 18, posted (8 years 9 months 2 weeks 5 hours ago) and read 2305 times:
Quoting SlamClick (Reply 16): I'm assuming that it was in case he lifted it clear of the support structure and then dropped it. They could snatch the collective up under their armpit and fly away instead of rolling a very expensive helicopter onto the ground