Refined Method for Initial Design Point Parameters in Preliminary Aircraft Design

Refined Method for Initial Design Point Parameters in Preliminary Aircraft Design | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Refined Method for Initial Design Point Parameters in Preliminary Aircraft Design Johannes Schneider, Andreas Strohmayer This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-6912628/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract In Aircraft Sizing tools, commonly a rather simple algorithm is used to determine the design space and the initial design point for an aircraft sizing iteration loop. A basic aircraft constraint chart which typically covers equations for cruise performance, landing speed, takeoff distance and minimum climb angle with one engine inoperative (OEI) is used to reveal the design space. The design point offers the possibility of obtaining an outlook on thrust loading and wing loading to be expected from the final aircraft which fulfils the Top Level Aircraft Requirements (TLARs), before entering in a full preliminary aircraft design iteration. In most cases, the parameters used for the design chart equations are selected by the aircraft design engineer or tool user, based on statistical data. Depending on experience, luck, data source or try and error behavior, the quality of the revealed design space can vary a lot. Hence the quality of the initial design point which is coherent to the design space quality. With an improved assumption of the reference values, the constraint diagram and thus the design point can be determined more precisely. With an initial design point as the start of a design iteration, which more precisely matches the final aircraft design, computer-aided aircraft design environments, such as UNICADO in the present case, can deliver a converged result with fewer iterations. This increases the productivity of the software. In this work, a methodology for the selection of improved reference values used to determine the constraint diagram is presented. Moreover, the magnitude of the parameters’ influence on the resulting design space is investigated. Combining these results, the most significant design parameters and their range of values can be identified. These parameters are part of an initial sizing aircraft reference database the software can make use of. An algorithm is presented, enabling the selection of the most representative set of reference data within the database for the desired aircraft design project. conceptual aircraft design initial aircraft sizing aircraft constraint diagram aircraft reference data Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-6912628","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":533870097,"identity":"a6102ac8-ae94-4ef6-9a4e-1a915bf70a6c","order_by":0,"name":"Johannes 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A basic aircraft constraint chart which typically covers equations for cruise performance, landing speed, takeoff distance and minimum climb angle with one engine inoperative (OEI) is used to reveal the design space. The design point offers the possibility of obtaining an outlook on thrust loading and wing loading to be expected from the final aircraft which fulfils the Top Level Aircraft Requirements (TLARs), before entering in a full preliminary aircraft design iteration.\u003c/p\u003e\n\u003cp\u003eIn most cases, the parameters used for the design chart equations are selected by the aircraft design engineer or tool user, based on statistical data. Depending on experience, luck, data source or try and error behavior, the quality of the revealed design space can vary a lot. Hence the quality of the initial design point which is coherent to the design space quality. With an improved assumption of the reference values, the constraint diagram and thus the design point can be determined more precisely. With an initial design point as the start of a design iteration, which more precisely matches the final aircraft design, computer-aided aircraft design environments, such as UNICADO in the present case, can deliver a converged result with fewer iterations. This increases the productivity of the software. In this work, a methodology for the selection of improved reference values used to determine the constraint diagram is presented. Moreover, the magnitude of the parameters’ influence on the resulting design space is investigated. Combining these results, the most significant design parameters and their range of values can be identified. These parameters are part of an initial sizing aircraft reference database the software can make use of. An algorithm is presented, enabling the selection of the most representative set of reference data within the database for the desired aircraft design project.\u003c/p\u003e","manuscriptTitle":"Refined Method for Initial Design Point Parameters in Preliminary Aircraft Design","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2025-10-31 10:46:26","doi":"10.21203/rs.3.rs-6912628/v1","editorialEvents":[{"type":"communityComments","content":0}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true}}],"origin":"","ownerIdentity":"e3166e7d-1469-4af4-bcf2-250aa73ec973","owner":[],"postedDate":"October 31st, 2025","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"posted","subjectAreas":[],"tags":[],"updatedAt":"2026-03-17T16:39:27+00:00","versionOfRecord":[],"versionCreatedAt":"2025-10-31 10:46:26","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-6912628","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-6912628","identity":"rs-6912628","version":["v1"]},"buildId":"XKTyCvWXoU3ODBz1xrDgd","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}