A method for estimating the lift and pitching moment on jet STOVL aircraft hovering in ground effect

Kuhn, Richard E.; Wardwell, William; Blake, William

doi:10.2514/6.1993-4816

Cited by 10 publications

(5 citation statements)

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“…15 that the contributions of the fore-and afterbody parts of the fuselage do not appear to contribute to the suckdown. 15 that the contributions of the fore-and afterbody parts of the fuselage do not appear to contribute to the suckdown.…”

Section: Lift Loss In Hover 31mentioning

confidence: 89%

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Lift Loss In Hover

2007

Jet Induced Effects

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Lift Loss In HoverT HE LARGEST hovering lift losses generally occur close to the ground.However, even when the aircraft is out-of-ground effect the entrainment action of the jet(s) can induce a significant download.The estimates of the effects of ground proximity on the suckdown in hover and the estimates of the jet-induced effects in transition, out-of-ground effect, should reduce to the out-of-ground effect level at altitude and in hover, respectively. The lift loss at altitude is therefore presented first.

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Section: Lift Loss In Hover 31mentioning

confidence: 89%

“…2.28 Typical fountain lift increments induced on three and four jet configurations 15. 2.28 Typical fountain lift increments induced on three and four jet configurations 15.…”

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confidence: 99%

Lift Loss In Hover

2007

Jet Induced Effects

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“…10. 20 show the lateral-velocity and bank-angle excursions in response to a step command input for the 0.1-and 0.4-rad/s systems. The differences in the initial velocity response are dramatic, as are the attitude changes that produce the velocity response.…”

Section: Lateral-velocity Command Systemmentioning

confidence: 99%

Dynamics, Control, and Flying Qualities of V/STOL Aircraft

Franklin¹

2002

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Dynamics, Control, and Flying Qualities of V/STOL Aircraft, by James Franklin, is a welcome addition to the technical literature in this rapidly developing, new field in aeronautical technology. This new publication appears at an opportune time, following the decision by the U.S. Air Force to develop a new strike aircraft F-35, a version of which will have vertical or short take-off and landing capabilities. Franklin is particularly qualified to write on the subject as the former head of Powered Lift Flight Dynamics at NASA Ames Research Center, Moffett Field, California. Additionally, the text incorporates lecture notes from the author's course on V/STOL dynamics, control, and flying qualities at Stanford University.The first three chapters include a brief history of V/STOL fixed wing and rotary wing aircraft, operations of V/STOL aircraft, and control strategy and desired control characteristics. The remaining chapters provide the underlying theory to study equations of motion and flying qualities for hover and forward flight, response to wind and turbulence, control augmentation, and cockpit displays. An appendix on aircraft stability derivatives as well as a comprehensive list of references are included.The AIAA Education Series of textbooks and monographs, inaugurated in 1984, embraces a broad spectrum of theory and application of different disciplines in aeronautics and astronautics, including aerospace design practice. The series also includes texts on defense science, engineering, and management. The books serve as teaching texts for students and reference materials for practicing engineers, scientists, and managers. The complete list of textbooks published in the series can be found on the end pages of this volume.

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“…19, these moments are given by the lift loss acting at the center of area. II.A of Chapter 2, the difference between the nose-down moment generated by the suckdown ahead of the jet and the nose-up moment induced aft of the jet.…”

Section: Pitching-moment Estimatesmentioning

confidence: 99%

STOL Operation (Transition-in-Ground Effect)

2007

Jet Induced Effects

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A method for estimating the lift and pitching moment on jet STOVL aircraft hovering in ground effect

Cited by 10 publications

References 1 publication

Lift Loss In Hover

Lift Loss In Hover

Dynamics, Control, and Flying Qualities of V/STOL Aircraft

STOL Operation (Transition-in-Ground Effect)

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A method for estimating the lift and pitching moment on jet STOVL aircraft hovering in ground effect

Cited by 10 publications

References 1 publication

Lift Loss In Hover

Lift Loss In Hover

Dynamics, Control, and Flying Qualities of V&#47;STOL Aircraft

STOL Operation (Transition-in-Ground Effect)

Contact Info

Product

Resources

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Dynamics, Control, and Flying Qualities of V/STOL Aircraft