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Publikationen von Professorinnen und Professoren der HAW Hamburg

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Dieter Scholz
Definition and Discussion of the Intrinsic Efficiency of Winglets
INCAS BULLETIN, 10(1):117-134
ISSN: 2066–8201

Schlüsselwörter: wingtip, winglet, induced drag, wing mass, aircraft design

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Zusammenfassung: Three simple equations are derived to define the "Intrinsic Aerodynamic Efficiency of Winglets" independent of the horizontal extension of the winglet and independent of the winglet’s (relative) height. This Intrinsic Aerodynamic Efficiency allows a quick comparison of purely the aerodynamic shape of winglets independent of the selected size chosen for a certain aircraft installation. The Intrinsic Aerodynamic Efficiency is calculated in 3 steps: STEP 1: The relative total drag reduction due to the winglet is converted into an assumed contribution of the winglet only on the span efficiency factor. STEP 2: If the winglet also increases span, its performance is converted into one without the effect of span increase. STEP 3: The winglet’s reduction in induced drag is compared to a horizontal wing extension. If the winglet needs e.g. to be three times longer than the horizontal extension to achieve the same induced drag reduction, its Intrinsic Aerodynamic Efficiency is the inverse or 1/3. Winglet metrics as defined are calculated from literature inputs. In order to evaluate winglets further, the mass increase due to winglets is estimated in addition to the reduction of drag on aircraft level and fuel burn.

Konferenz, Symposium, Vortragsreihe, Einzelausstellung, Modenschau, Künstl. Leitung (als Ausrichter):

Jaroslav Juracka, Tomasz Goetzendorf-Grabowski, Dieter Scholz und andere
EWADE 2018 - 14th European Workshop on Aircraft Design Education
Brno, Czech Republic, 07.-09.11.2018
CEAS Technical Committee Aircraft Design (TCAD)
Council of European Aerospace Societies (CEAS)

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Dieter Scholz, Richard Sanderson und andere
Hamburg Aerospace Lecture Series (HALS)
HAW Hamburg, Januar bis Dezember 2018
HALS - Vortragsarchiv
Verlag: Deutsche Gesellschaft für Luft- und Raumfahrt (DGLR),

Schlüsselwörter: Luftfahrt, Raumfahrt, Flugzeug, aviation, space, aerospace, aircraft

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Zusammenfassung: HAMBURG AEROSPACE LECTURE SERIES (HALS) ----- Lectures on aeronautics and astronautics are arranged jointly by the local branches of these organizations in Hamburg: >>> German Society for Aeronautics and Astronautics (DGLR) >>> Royal Aeronautical Society (RAeS) >>> The Association of German Engineers (VDI) >>> ZAL - Center of Applied Aeronautical Research >>> Hamburg University of Applied Sciences (Hamburg UAS).


Dieter Scholz
Aircraft Systems
M.F. Platzer B.N. Agrawal (Hrsg.) Standard Handbook for Aerospace Engineers
Seite 13-112.
Verlag: McGraw-Hill and SAE International, New York
ISBN: 978-1259585173

Schlüsselwörter: Avionics, Aircraft, Spacecraft, Aerodynamics, Launch vehicles

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Zusammenfassung: This resource presents theories and practices from more than 50 specialists in the many sub-disciplines of aeronautical and astronautical engineering. The book contains (on 1369 pages) complete details on classic designs as well as the latest techniques, materials, and processes used in aviation, defense, and space systems. Table of Contents: Futures of aerospace --- Aircraft systems (SCHOLZ, Dieter) --- Aerodynamics, aeroelasticity, and acoustics --- Aircraft performance --- Aircraft flight mechanics, stability, and control --- Avionics and air traffic management systems --- Aeronautical design --- Spacecraft design --- Astrodynamics --- Rockets and launch vehicles --- Earth's environment and space --- Attitude dynamics and control


Dieter Scholz
Evaluating Aircraft with Electric and Hybrid Propulsion
Electric & Hybrid Aerospace Symposium
Proceedings of the Electric & Hybrid Aerospace Symposium 2018
Verlag: UKIP Media & Events, Dorking, Surrey, UK

Schlüsselwörter: Luftfahrt, Luftfahrzeug, Hochgeschwindigkeitszug, Flugmechanik, Flugtriebwerk, Elektroantrieb, Hydraulischer Antrieb, Hybridfahrzeug, Bewertung, Umweltbilanz, Aeronautics, Airplanes, Flight, High speed trains, Electric propulsion, Evaluation

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Zusammenfassung: >>> Purpose – This presentation takes a critical look at various electric air mobility concepts. With a clear focus on requirements and first principles applied to the technologies in question, it tries to bring inflated expectations down to earth. Economic, ecologic and social (noise) based well accepted evaluation principles are set against wishful thinking. >>> Design/methodology/approach – Aeronautical teaching basics are complemented with own thoughts and explanations. In addition, the results of past research projects are applied to the topic. >>> Findings – Electric air mobility may become useful in some areas of aviation. Small short-range general aviation aircraft may benefit from battery-electric or hybrid-electric propulsion. Urban air mobility in large cities will give time advantages to super-rich people, but mass transportation in cities will require a public urban transport system. Battery-electric passenger aircraft are neither economic nor ecologic. How overall advantages can be obtained from turboelectric distributed propulsion (without batteries) is not clear. Maybe turbo-hydraulic propulsion has some weight advantages over the electric approach. >>> Research limitations/implications – Research findings are from basic considerations only. A detailed evaluation of system principles on a certain aircraft platform may lead to somewhat different results. >>> Practical implications – The discussion about electric air mobility concepts may get more factual. Investors may find some of the information provided easy to understand and helpful for their decision making. >>> Social implications – How to tackle challenges of resource depletion and environment pollution is a social question. Better knowledge of the problem enables the public to take a firm position in the discussion. >>> Originality/value – Holistic evaluation of electric air mobility has not much been applied yet. This presentation shows how to proceed.

S. Ahmad Fazelzadeh, Dieter Scholz, Abbas Mazidi und Michael I. Friswell
Flutter Characteristics of Typical Wing Sections of a Box Wing Aircraft Configuration
Advanced Aircraft Efficient Global Air Transport System (AEGATS 2018)
Proceedings of the AEGATS Conference 2018
Association Aéronautique et Astronautique de France (3AF)

Schlüsselwörter: Flutter, BWA, Wing, Section, Aircraft, Boxwing, Configuration

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Zusammenfassung: In this paper, the aeroelastic modeling and conceptual flutter analysis of a simple 2-D box wing is investigated. For each wing the torsion and bending elasticity is simulated by two torsional and longitudinal springs at its elastic axis. Furthermore, the connection winglet is simulated by a longitudinal spring. The aeroelastic governing equations are derived using Lagrange’s equations. Also, for aeroelastic loads simulation on the box wing, the Theodorsen aerodynamic model is used. The effects of various design parameters such as front and rear wing physical and geometrical properties, the connection winglet angle and stiffness, and aircraft altitude on the flutter of the system are investigated. Results show that the connection winglet stiffness and angle have significant influence on the box wing flutter boundary.

Dieter Scholz
Technical Solutions to the Problem of Contaminated Cabin Air
Deutscher Luft- und Raumfahrtkongress 2018
Dokumente zum DLRK 2018
Verlag: Deutsche Gesellschaft für Luft- und Raumfahrt,

Schlüsselwörter: Flugzeug, Kabine, Klimaanlage, Triebwerk, Kabinenluft

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Zusammenfassung: >>> Purpose – This presentation gives an introduction to the problem of contaminated cabin air and points out possible solutions especially by looking at carbon filters placed in the main path of the bleed air from the engine to the cabin ("total cabin air filtration") in additon to filters in the cabin air recirculation path. Maintenance issures related to the topic are also considered. >>> Design/methodology/approach – The literature review is complemented with own explanations, thoughts and derivations. >>> Findings – There is a real health and flight safety risk due to contaminated cabin air. For the infrequent flyer the risk is very low. Also aviation statistics are not dominated by cabin air related accidents. Nevertheless, a bleed air based air conditioning system can be regarded as applying a fundamentally wrong systems engineering approach. A substantial improvement of the situation can only be reached with filters added to the large fleet of existing airplanes. A full solution, however, requires airconditioning with outside air and dedicated compressors. >>> Research limitations/implications – The study is based primarily on references. >>> Practical implications – Passengers and crew are made aware of the risk of cabin air contamination based on technical facts. Given detailes of technical solutions contribute to the scientific discussion. >>> Social implications – Better knowledge of the problem should enable passengers and crew to maintain a firm position in the sometimes heated discussion. >>> Originality/value – Engineering based information with a critical view on the topic seems to be missing in public. This presentation contributes filling this gap.


Dieter Scholz
Table of Contents of the Short Course "Fundamentals of Aeronautical Engineering" / "Grundlagen des Flugzeugbaus"

Schlüsselwörter: FF-SCAF

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Zusammenfassung: The Short Course is intended for technically educated participants new to the field of aeronautics. Aim is to give an overview of the main subjects in aeronautical engineering: The Aviation System, Aerodynamics, Flight Mechanics, Aircraft Engines, Aircraft Structures, Aircraft Systems, Aircraft Design. Teaching includes seminar style lectures, videos, computer based training and the use of simulators.

Konferenz-/Workshop-/Podiumsdiskussionsbeiträge, Ausstellungs-/Modenschaubeteiligungen:

Dieter Scholz
Cabin Air Contamination - An Aeronautical Perspective (59. Kongress der Deutschen Gesellschaft für Pneumologie und Beatmungsmedizin e.V., Dresden, 16. März 2018)

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Zusammenfassung: >>> Purpose: This presentation gives an introduction to aircraft cabin air contamination with an emphasis on contamination due to jet engine oil entering the cabin from the jet engine or auxiliary power unit (APU) via the bleed air system and the air conditioning system. The possible application of sensors and filters is discussed. Filters can be retrofitted. A bleed-free air conditioning architecture, however, seems only financially viable for newly designed aircraft. >>> Design/methodology/approach: The presentation collects existing facts and combines them with own thoughts. >>> Findings: There is a real health and flight safety risk due to contaminated cabin air. For the infrequent flyer the risk is very low. Also aviation statistics are not dominated by cabin air related accidents. Nevertheless, a bleed air based air conditioning system can be regarded as applying a fundamentally wrong systems engineering approach. Measures have to be taken to solve this. >>> Research limitations/implications: This review study is based on references. Own measurements have not been made. >>> Practical implications: The topic has been presented as background information for respiratory physicians. >>> Originality/value: Engineering based information with a critical view on the topic seems to be missing in public. This presentation tries to fill this gap.

Dieter Scholz
End-of-Life for Cabin Equipment - Disposal or Recycling (Panel Discussion, Forecast Sessions, Aircraft Interiors Expo, Hamburg, 11.04.2018)
Verlag: Flight Global,

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Letzte Änderung: 23.01.15

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