By D.R. Philpott, R.H. Barnard
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Additional info for Aircraft Flight: A description of the physical principles of aircraft flight
The cyclic pitch control is used to control both the nose-up (or nose-down) attitude of the helicopter, and the roll motion about the longitudinal axis. The small tail rotor is also provided with a mechanism which can be used to vary the incidence of its blades, thus altering the amount of thrust produced. This allows it to be used to yaw the aircraft. QXD 14/9/09 15:18 Page 29 LIFT FROM ROTATING WINGS Fig. 25 A pair of co-axial counter-rotating rotor blades removes the need for a tail rotor on this Kamov Ka-50.
Simple experiments conﬁrmed that high aspect ratio wings produced a better ratio of lift to drag than short stubby ones for ﬂight at subsonic speeds. The reasons are given later in this chapter. The generation of lift by a wing In order to understand how the planform of the wing affects lift and drag, we need to look at the three-dimensional nature of the air ﬂow near a wing. You may remember, that we described in Chapter 1, how the wing produced a circulatory effect; behaving like a vortex. QXD 14/9/09 15:20 Page 38 38 WINGS Fig.
Although mainly of historical interest, there has been some renewed interest in the autogyro for recreational ﬂying, as illustrated by the example shown in Fig. 31. As on the helicopter, the blades of an autogyro are normally free to ﬂap up and down. In ﬂight, the difference in the relative velocity between the advancing and retreating sides again tends to cause the blades to ﬂap up towards the front and down towards the rear, thus tilting the axis of blade rotation rearwards. For an autogyro, this rearward tilt presents no problem, as the forward thrust is provided by a separate propeller.
Aircraft Flight: A description of the physical principles of aircraft flight by D.R. Philpott, R.H. Barnard