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Stability
Published in Rose G. Davies, Aerodynamics Principles for Air Transport Pilots, 2020
Dihedral wing can produce restoring rolling moment when aircraft is in a disturbance in roll. For example, when an aircraft with dihedral wing is in a disturbance of left roll, i.e. the left wing is down and it sideslips to the left. Its sideslip angle is negative. It means that the relative airflow (RA: or relative airspeed) comes from the left of heading, then the RA forms a greater AoA to the left wing than the AoA it forms to the upper wing – the right wing. As the result of different AoA, the left wing will produce more lift that the right wing does, as shown in Figure 5.18 (The arrows represent the lift produced by each wing). In turn, the lift on the left wing generates greater moment of right roll than the left-roll moment by the lift on the right (upper) wing. The greater right-roll moment assists the aircraft to roll back to its original equilibrium position.
The system solution
Published in Stephen D. Prior, Optimizing Small Multi-Rotor Unmanned Aircraft, 2018
The dihedral effect is used on many fixed-wing aircraft wings for roll stability and the cant angle has been successfully applied to many rotary-wing tail rotors for increased lift (30%) and CoG aftwards shift capability (see below).
Geometric design and energy absorption of a new deployable cylinder tube
Published in Mechanics of Advanced Materials and Structures, 2022
Qiang Wang, Shiqiang Li, Zhifang Liu, Guiying Wu, Jianyin Lei, Zhihua Wang
To join elements P1 to form a three-dimensional thin-walled structure, as shown in Figure 1(c), the following geometric relationship should be satisfied: where is the angle between and is the angle between and is the dihedral angle between plane and the horizontal plane, is the angle between line and is the angle between and is the dihedral angle between planes and and is the dihedral angle between planes and
Quasi-static compressive behaviour of 3D-printed origami-inspired cellular structure: experimental, numerical and theoretical studies
Published in Virtual and Physical Prototyping, 2022
Qixun Li, Xudong Zhi, Feng Fan
Through the kinematic principle of rigid folding, the geometric relationships of the following parameters can be obtained as in which θ1 is the dihedral angle between face ABKJ and face JKNM, θ2 is the dihedral angle between face ABKJ and face BCLK, θ3 is the dihedral angle between face EFCB and face HIFE.in which,andare the compressed θ1, θ2, and θ3, respectively. Thus, the bending energy of the three types of units can be calculated as following formulas,
Synthesis, spectroscopic characterization, X-ray crystal structure, antimicrobial, DNA-binding, alkaline phosphatase and insulin-mimetic studies of oxidovanadium(IV) complexes of azomethine precursors
Published in Journal of Coordination Chemistry, 2020
Khurram Shahzad Munawar, Saqib Ali, Muhammad Nawaz Tahir, Nasir Khalid, Qamar Abbas, Irfan Zia Qureshi, Shabbir Hussain, Muhammad Ashfaq
In HL1 (Figure 1, Table 1), the o-cresol moiety A (C1–C7/O1) and m-toluidine moiety B (C8–C14/N1) is planar with r.m.s. deviation of 0.0344 and 0.0119 Å, respectively. The dihedral angle A/B is 41.1(7)°. In (trifluoromethyl)benzene, the fluorine atoms are disordered over three sets of sites with occupancy ratio 0.364(3):0.335(3):0.301(3). The dihedral angles between major part of disordered fluorine moiety C (FIA–F3A), the intermediate disordered fluorine moiety D (F1B–F3B) and the minor part of disordered fluorine moiety E (F1C–F3C) C/D, D/E and C/E is 13.01(1)°, 4.97(2)° and 18.03(7)°, respectively. The dihedral angles B/C and B/D are 78.16(4)°, 88.97(37)° and 84.08(49)°, respectively; these dihedral angles show that the m-toluidine moiety B is nearly perpendicular to the disordered fluorine moieties D and E, respectively. The crystal exists in tautomeric form, as the phenolic hydrogen is not transferred to nitrogen of amine. Intramolecular hydrogen bonding exists, since the OH group of o-cresol moiety A interacts with nitrogen of m-toluidine moiety B through O–H…N bonding to form S(6) loop [40] (as shown in Figure S3 and given in Table 2). No intermolecular hydrogen bonding found in the crystal packing.