The helicopter flew before, especially even fly, is it was  most basic a kind of to fly the appearance.The helicopter is a kind of conveyance tool, mainly before depend on fly to complete its homework mission.For understanding the flight characteristics that the relevant helicopter flew before betterly, from have no etc. that the side slip soon and straightly even fly the hand, the relevant rising  rate Vy was not to zero before to fly to stay to introduce in the next section. The level of the helicopter flies the brief name straightly even fly.Even fly is a helicopter to use the most flight appearance, many characteristicses of the wing of 旋 care to fly express more obviously.Many function decisions that helicopter is even to fly in the air motive characteristic of the wing of 旋 , so need the head explain first this kind of fly the appearance helicopter of dint and wing of 旋 need the hard working rate.

Even fly the balance of the dint of hour

  Opposite is even to fly in the speed stalk department, the function mainly has the 旋 to get empty to pull the dint T in the dint on the helicopter, the whole machine  gravity G, the machine body discards the resistance X body and the tail oars to push the dint T tail.Fly before the speed stalk fasten the principle of the selection is: The X uranium points to the airspeed V direction; The Y stalk perpendicularity headings up in the X stalk for positive,2 stalks press the right hand rule assurance.Keeping the helicopter etc. is soon and straightly even  equilibrium condition of the dint for fly for.( pay respects to the figure 2.1-43)

Even fly the balance of the dint of hour

X stalk:T2= X body

Y stalk: T1=G

Z stalk:The T3 about is equal to the T tail

  Among them Tl, T2, the T3 difference pulls the dint for the wing of 旋 in the X, Y, three weights of direction of Z. Take the tail oar helicopter for the single wing of 旋 , because of the tail oar  stalk line usually not in wing of 旋 revolve flat surface, in order to keep the side toward the dint 矩 balance, the helicopter takes the slope Cape r slightly, the past tail oar pushes the dint in accordance with of the horizontal plane clip the Cape is the y, the T tail and the T3 directions the incompletion, because the y Cape is very small, namely the cosr about is equal to 1, the past Z looks like the mark of equality toward the dint adoption.

Even fly to need the hard working rate and it with the variety of the speed

  Even fly, perpendicular weight Vv of airspeed=0, the wing of 旋 all has no to move in the gravity direction and direction of Zs, in these two cent dints of direction not do the 功 , the wing of 旋 need the hard working rate to be constitute by three parts at this time:A 阻 power- P type;Induce the power- P guide;Discard the power- P of 阻 discard.Among them Clause 3 is the wing of 旋 pulls to beat to take the fuselage of airplane resistance eliminate to consume of power.

  From top the diagram can see, the wing of 旋 pull the dint T2 of the second cent of the dint can equilibrium fuselage of airplane resistance X body.To wing of 旋 , it divides the dint T2 to make to move with the speed V at the X stalk direction.Obviously the wing of 旋 needses must the 功 , P= the T2V or Ps discard= the X body V, but the fuselage of airplane discard the body of 阻 X under the condition of the fuselage of airplane  opposite horizontal plane  carriage variety is not big, its value looks like to become the direct proportion with V square, discarding the 阻功 thus

Even fly to need the hard working rate with the variety of the speed

The rate P discard and then can look like to think with even fly soon three powers of the degree become the direct proportion, as above diagram in of order the lineation ③ to show.

  Even fly, induce the power to guide for the P= TV, among them, the T pulls the dint for the wing of 旋 , vl for induce the speed.When fly the weight constant, looking like to think that the wing of 旋 pulls the dint constant, induce the speed 271 with even fly the aggrandizement of the speed V but let up, so even fly to induce the power P to guide with even fly the variety of the speed V as above diagram in thin solid the line ② show.

  Even fly a 阻  power corpse type to then have something to do with oar leaf equally face Cape.With even fly the speed to increase it to face the Cape variety equally not big.So P type with fly the variety of the speed V not big, if the dotted line ① in diagram show.

  The solid line ④ within diagram is above-mentioned 3 items and, namely total and even fly need hard working the rate P is even to need with even fly the variety but the variety of the speed. It is a curve of saddle form:When small speed is even to fly, discard the power of 阻 very small, but induce the power at this time very big, so total still fly to need the hard working rate very greatly.But the ratio hang to stop want to be a little smaller.Within the scope of certain speed, along with even fly the increment of the speed, because of inducing the nasty play of power to descend, but discard the power of 阻 to increase the quantity not big, so total and even fly to need the hard working rate with fly the increment of the speed to present under decline the trend, but this kind of descend the trend with the V of gradual deceleration of increment.The speed continues to increase then because of discarding the power of 阻 with even fly the nasty play of the speed increment increment.Even fly to need the hard working rate with the V increment at attain even fly to need the hard working rate a little bit lowest after increase;Total and even fly to need the hard working rate to then present the up-trend with the V variety, and become more and more obvious.

Behind fly of the helicopter

Opposite current of air dissymmetry, cause to brandish and oar the leaf faces the horny variety

The side of the helicopter fly

  It is helicopter that side fly special again a kind of flight appearance, it with hang to stop, perpendicular flight of small speed and fly behind is a flight function that carries out the some and special homework indispensability together.It is the flight appearance of the implement that general side fly in hanging to stop the foundation.Its characteristics wants to notice side more toward the variety and the balance of the dint.Because the side of the helicopter machine body to cast shadow the area very big, the machine body at the side fly its air moves the dint resistance special big, so the helicopter side often fly the speed very small.Because the single wing of 旋 takes the side of the tail oar helicopter to is is asymmetric by dint, so the left side fly similar to right side fly to be subjected to the dint eachly not.Backward go the oar leaf a the side side fly, the wing of 旋 pull dint backward go the oar an example level weights of leaf are big in forward go the oar one side of leaf of tail oar push the dint, keep rise machine backward the direction sport, will produce is anti- with the level weight to of air motive resistance Z.When the side dint balance, the level weight is equal to the tail oar to push the dint and the air motive resistance and, can keep etc. soon and backward go the oar leaf a the side side fly.Forward go the oar leaf When a side fly, the wing of 旋 pulls the level weight of the dint small push the dint in the tail oar, push the dint function in the surplus tail oar under, the helicopter pushes a sport of the dint direction toward people\'s oar, the air motive resistance and the tail oars push the dint anti- to, be the side dint balance, keep etc. soon and forward go the oar leaf a side fly.