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Dynamic Rollover of Gyroplanes during Landing—Cause and Prevention

Duda, Holger and Sachs, Falk and Seewald, Jörg and Lorenz, Sven (2022) Dynamic Rollover of Gyroplanes during Landing—Cause and Prevention. CEAS Aeronautical Journal. Springer. doi: 10.1007/s13272-022-00575-5. ISSN 1869-5590.

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Official URL: https://link.springer.com/content/pdf/10.1007/s13272-022-00575-5.pdf


While new-generation gyroplanes are very stable during fight, the susceptibility to roll over briefy after touching down is still the issue due to incorrectly applied landing procedure. A tendency to dynamically roll over is also known from helicopters but rarely from airplanes. The main cause for rotary wing aircraft’s risk to rollover is the rotor force which is still relevant after touching down. The triangular wheel system of a gyroplane in combination with high centre of gravity is another factor for gyroplane’s rollover susceptibility during landing. Typical situations provoking a rollover are landings during severe crosswind or taxiing at too high ground speeds with a rotating rotor. Both situations are related to incorrect piloting techniques. In this paper, the forces acting on the gyroplane during landing were investigated to understand the physical principles. Analytical equations were evaluated using the data of a reference gyroplane in combination with a single-track model known from road vehicle dynamics. It appeared that a steering oversensitivity may occur if the pilot moves the stick forward too early after touching down. Non-linear simulations with a validated model of the reference gyroplane confrmed these analyses. Design parameter studies were conducted to analyse the impact on rollover susceptibility. Finally, this study confrmed that a rollover of a gyroplane during landing is most unlikely if the pilot applies the correct technique, which means pulling the control stick back properly after touching down.

Item URL in elib:https://elib.dlr.de/186182/
Document Type:Article
Title:Dynamic Rollover of Gyroplanes during Landing—Cause and Prevention
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Sachs, FalkUNSPECIFIEDhttps://orcid.org/0009-0008-5781-0289UNSPECIFIED
Lorenz, SvenUNSPECIFIEDhttps://orcid.org/0000-0002-2133-227XUNSPECIFIED
Date:21 March 2022
Journal or Publication Title:CEAS Aeronautical Journal
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Gyroplane · Gyrocopter · Autogyro · Rollover · Landing · Steering oversensitivity · Single-track model
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L - no assignment
DLR - Research theme (Project):L - no assignment
Location: Braunschweig
Institutes and Institutions:Institute of Flight Systems
Institute of Flight Systems > Flight Dynamics and Simulation
Institute of Flight Systems > Leitungsbereich FT
Deposited By: Sachs, Falk
Deposited On:01 Dec 2022 11:29
Last Modified:19 Oct 2023 13:37

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