Junkers J.I by Peter M. Grosz

By Peter M. Grosz

Junkers J.I КНИГИ ;ВОЕННАЯ ИСТОРИЯ Junkers J.I (Windsock Datafile 39)ByPeter M. GroszPublisher:Albatros Productions Ltd1993 40PagesISBN: 0948414499PDF41 MBThe striking Junkers J.I used to be the most major warplanes of the 1st global struggle accurately pleasant the jobs for which it used to be designed: low-level contour wrestle, tactical reconnaissance and speak to patrol tasks. huge use of armour plate made the J.I ordinarily well-liked by its crews who liked the safety afforded through the aeroplane's difficult building whereas they played their a variety of, and hugely harmful, tasks over the battlefield. evenly armed the J.I however proved invulnerable to enemy fireplace and as writer P M Grosz relates, now not one used to be ever recorded shot down in motion. Our thirty eighth DATAFILE represents the 1st monograph solely dedicated to this heavyweight armoured biplane. sharingmatrix eighty five

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Scale effects tend to be larger than for many other parameters, owing to the sensitivity of the hinge moment to the state of the boundary layer at the trailing edge. Two-dimensional airfoil theory shows that the hinge moment of simple flap controls is linear with angle of attack and control angle in both subsonic and supersonic flow. The normal-force distributions typical of subsonic flow associated with changes in a and 6, are shown qualitatively in Fig. 23. The force acting on the movable flap has a moment about the hinge that is quite sensitive to its location.

16 Effect of elevator angle on C, curve. (a) Elevator angle. (b) C,,, - a curve. ( c ) C, a curve. through a constant positive angle then shifts the Cm-acurve downward, without change of slope (Fig. 16b). At the same time the zero-lift angle of the airplane is slightly changed (Fig. 16~). 2,6) gives the vehicle lift. 4 Longitudinal Control 35 in which only the first term applies for tailless aircraft and the second for conventional tail elevators or all moving tails (when i, is used instead of 6,).

3,1). 3,l). 3,3) depends linearly on the CG position, h. Since CLUis usually large, the magnitude and sign of Cmodepend strongly on h. This is the basis of the statement in Sec. 2 that CmUcan always be made negative by a suitable choice of h. The CG position h, for which CmUis zero is of particular significance, since this represents a boundary between positive and negative pitch stiffness. In this book we define h, as the neutral point, NP. 3,2) simplifies the latter to which is valid whether Cmll(,",, and C,,, vary with a or not.

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