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Undersling and 2/rev
If an over weight pilot exceeds the recommended seat weight of his
helicopter, will this affect undersling enough to cause an increase in the 2/rev vibration??? Does increasing G forces cause an increase in 2/rev?? Stu |
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Undersling and 2/rev
"Stu Fields" wrote in message
... If an over weight pilot exceeds the recommended seat weight of his helicopter, will this affect undersling enough to cause an increase in the 2/rev vibration??? Does increasing G forces cause an increase in 2/rev?? Stu On the first question, if you're talking about flying the bird outside the recommended CG range, I'd think it's a possibility, especially the farther out you go. Taken to extremes, wouldn't flying an under slung system far enough out of the CG range risk mast bumping during certain maneuvers? Don't know about the second question. Is the 2/rev vibration really increasing or are the pilot and passengers just feeling it more because of the G loading? Either way, I'd think it would "encourage" those involved to try to improve the situation! Fly Safe, Steve R. |
#3
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Undersling and 2/rev
"Steve R." wrote in message ... "Stu Fields" wrote in message ... If an over weight pilot exceeds the recommended seat weight of his helicopter, will this affect undersling enough to cause an increase in the 2/rev vibration??? Does increasing G forces cause an increase in 2/rev?? Stu On the first question, if you're talking about flying the bird outside the recommended CG range, I'd think it's a possibility, especially the farther out you go. Taken to extremes, wouldn't flying an under slung system far enough out of the CG range risk mast bumping during certain maneuvers? Don't know about the second question. Is the 2/rev vibration really increasing or are the pilot and passengers just feeling it more because of the G loading? Either way, I'd think it would "encourage" those involved to try to improve the situation! Fly Safe, Steve R. What I was thinking of was just a heavy pilot within the c.g range. Since the coning angle and subsequently the proper undersling depend on the gross weight. Since an extra heavy pilot would exceed the design maximum gross weight, the existing coning angle and undersling would not be optimum. Could we expect an increase in 2/rev and if so why? I have found a case of a Mosquito pilot who stands closer to the lunch line than he should, complaining of 2/rev after he had taken pains to track and balance thinking that the vibration might be 1/rev. It seems that if the heavy pilot could cause increase 2/rev, you should feel it also in an accelerated turn. I'm not just talking about pilot sensations, we can measure the amplitude of the 2/rev vibrations both vertical and lateral by fooling the electronic balancer with two reflective tapes on the blade position sensor. I have not done a measurement in an accelerated maneuver and my ship is down now so I ain't got a vehicle for the test. I am hoping to stumbel accross some individual that has already experienced and measured the 2/rev vibration in say a 2G turn and straight and level... As an engineer, I have to have a problem to look at or my mind goes numb. I love helicopters. There is no end of problems to look at. Especially vibrations. |
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itchy scalp is a ailment that has an effect on the hair follicles, which are
male pattern baldness aspect of the skin from which hairs expand. In most instances, hair falls out in tiny, round patches about the dimensions of a quarter. The extent of the hair reduction alopecia areata varies in some instances, it is only in a very few spots. In others, the hair reduction can be increased. Occasionally it can entail the whole scalp (alopecia totalis) or even all the system and scalp (alopecia universalis). It is not achievable to predict how significantly hair will be misplaced. Regrowth of hair in normal alopecia areata is normal more than a time period of months or, often, years, but won't be able to be guaranteed. The hair occasionally regrows white at least in the 1st instance. More hair reduction is not uncommon. In alopecia totalis and alopecia universalis the probability of complete regrowth is less. |
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