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This study sets out to investigate the elements of the collaborative culture required for the successful implementation and sustainability of programs in schools. It draws on a case study of a student peer-led physical activity (PA) program implemented within the complex and dynamic environment of school communities in New Zealand. The article outlines four key components needed to effectively implement and impact long term sustainability of a program within the school context.

This qualitative case study examines the implementation of a new peer-led PA program introduced across eight New Zealand schools. Data were collected from semi-structured interviews with senior leaders, teachers and parents and analyzed through a complexity theory lens.

Effective and sustainable program implementation requires a strategic, collaborative approach through actively engaging with and resourcing four key interacting components: student choice, voice and agency; collective responsibility; shared understanding of purpose; and curriculum coherence.

This research offers a pragmatic approach to developing collaborative school communities that can effectively implement change by highlighting key areas of focus that policymaker, school leaders and program designers can plan for.

Composite materials and metallic structures already compete for the next generation of single-aisle aircraft. Despite the good mechanical properties of composite materials metallic structures offer challenging properties and high cost effectiveness via the automation in manufacturing, especially when metallic structures will be welded. In this domain, metallic aircraft structures will require weight savings of approximately 20 per cent to increase the efficiency and reduce the CO₂ emission by the same amount. Laser beam welding of high-strength Al-Li alloy AA2198 represents a promising method of providing a breakthrough response to the challenges of lightweight design in aircraft applications. The key factor for the application of laser-welded AA2198 structures is the availability of reliable data for the assessment of their damage tolerance behaviour. The paper aims to discuss these issues.

In the presented research, the mechanical properties concerning the quasi-static tensile and fracture toughness (R-curve) of laser beam-welded AA2198 butt joints are investigated. In the next step, a systematic analysis to clarify the deformation and fracture behaviour of the laser beam-welded AA2198 four-stringer panels is conducted.

AA2198 offers better resistance against fracture than the well-known AA2024 alloy. It is possible to weld AA2198 with good results, and the welds also exhibit a higher fracture resistance than AA2024 base material (BM). Welded AA2198 four-stringer panels exhibit a residual strength behaviour superior to that of the flat BM panel.

The present study is undertaken on the third-generation airframe-quality Al-Li alloy AA2198 with the main emphasis to investigate the mechanical fracture behaviour of AA2198 BMs, laser beam-welded joints and laser beam-welded integral structures. Studies investigating the damage tolerance of welded integral structures of Al-Li alloys are scarce.

This conceptual paper first examines the critical evolutionary stage of systems methodologies – from hard systems to soft systems, and elaborates their different focuses. This paper further explores the granularity of the “softness” of systems methodologies, and identifies a missing part: emotion. The emotional aspect of systems is associated to various soft elements of systems methodologies, such as value, perception, human well‐being, creativity and learning. Unfortunately, existing literature does not demonstrate a sufficient consideration of the role of emotion in systems methodologies. This paper incorporates the emotional aspect and discusses the role of emotion in effective systems methodologies.

THE standard weapons of the Luftwaffe at the beginning of the Battle of Britain were the M.G.15, the M.G.17 and the 20 mm. (Oerlikon) M.G. F.F. The M.G.15 was a free gun firing the 7·92 mm. Mauser cartridge. It was fitted in all types of aeroplane except single‐seater fighters. The M.G.17 was the standard fixed rifle calibre gun using the same ammunition as the M.G.15. Both these weapons were derived from the Swiss Solothurn and have been commonly, if incorrectly, known by that name. While it is clear that the letters M.G. in the German system of nomenclature stand for Machinen Gewehr we do not know the significance of the number.

The objective of this study was to perform damage analysis of SCM435 high-tension bolts connecting upper and lower parts of a three-stage injection molding machine.

Damage material used in this study was a SCM435 high-strength bolt connecting upper and lower molds of a three-stage injection mold. Causes of damage were determined by macroscopic observation. Microstructure observation was done using a metallic microscope, scanning electron microscope (SEM, S-2400, HiTachi, Japan), energy dispersive X-ray spectroscopy (EDS, Kevex Ltd., Sigma) and Vickers hardness tester (HV-114, Mitutoyo). Fatigue limit of the damaged material was evaluated using equivalent crack length.

Bolts were fractured by cyclic bending stress in the observation of ratchet marks and beach marks. The damaged specimen showed an acicular microstructure. Impurity was observed. Chromium carbide was observed near the crack origin. Both shape parameters of the Vickers hardness were similar. However, the scale parameter of the damaged specimen was about smaller than that of the as-received specimen. Much degradation occurred in the damaged specimen. Bolts should undergo accurate heat treatment to prevent the formation of chromium carbide. They must prevent the action of dynamic stresses. Bolts need accurate tightening and accuracy of heat treatment. Screws require compression residual stress due to peening.

This study conducted failure analysis of damaged SCM435 bolts connecting upper and lower parts of the three-stage injection mold. Fatigue limit of the damaged material was evaluated using equivalent crack length. In order to control this fracture, accurate tightening of bolts, accuracy of heat treatment and screws are required for compression residual stress due to peening.

EACH September the eyes of the aeronautical World turn towards the S.B.A.C. Air Display and Exhibition with interest unequalled by any other event. It is fitting that the Display is now held each year at the airfield of the Royal Aircraft Establishment, one of the world's most prominent aeronautical research centres. This interest becomes increasingly keen too, as the preview day comes closer, because new prototypes of unorthodox designs often appear a short time before the Show to illustrate the results of years of careful planning, development and research of the particular company. These designs often mould the path of progress for smaller countries without the economic resources to forge the way ahead alone. Most British citizens are very proud of their country's place in aviation today, both in the military and civil fields. This is understood by most foreigners because it is clear that Britain has won a place in aeronautical development second to none.

Armstrong, Whitworth Aircraft, Ltd., Coventry.—Aircraft, Reconditioning of: Supermarine Aviation Works (Vickers), Ltd., Woolston. Aircraft, Spares: Blackburn Aeroplane & Motor Co., Ltd., Brough; Westland Aircraft Works, Yeovil.—Bitumen: Asiatic Petroleum Co., Ltd., London, E.C.—Blocks, Terminal: Oliver Pell Control, Ltd., London, S.E.—Brushes: C. H. Leng & Sons, Birmingham.—Camera Spares: Thornton Pickard Manufacturing Co., Ltd., Altrincham.—Canvas Duck: Jas. Stott, Ltd., Oldham.—Coats, Great: L. Silberston & Sons, London, E.—Cylinders: Walter Kidde Co., Ltd., Hanwell.—Dopes and Identification Colours: Nobel Chemical Finishes, Ltd., Slough.—Engines, Aero, Reconditioning and Spares: Bristol Aeroplane Co., Ltd., Filton.—Engines, Aero, Spares, Repair of: D. Napier & Son, Ltd., London, W.—Engines, Aero, Spares: Rolls‐Royce, Ltd., Derby.—Glycerine: D. Thorn & Co., Ltd., Pendleton.—Landplane: De Havilland Aircraft Co., Ltd., Edgware.—Lay‐out of Moorings and Mark Buoys: Thos. Round & Sons, Scarborough.—Limousines, Humber, Pullman: Rootes, Ltd., Coventry.—Locomotive, Diesel: F. C. Hibbard & Co., Ltd., London, N.W.—Magnetos: British Thomson‐Houston Co., Ltd., Coventry; Rotax, Ltd., London, N.W.—Mahogany: M. A. Morris, London, N.—Nippers: Wynn Timmins & Co., Ltd., Birmingham.—Pantaloons: L. Silberston & Sons, London, E.—Plugs and Sockets: Vickers (Aviation), Ltd., Weybridge.—Pumps, Fuelling: Zwicky, Ltd., Slough.—Thermometers, Radiator: Negretti & Zambra, London, E.C —Transmitters: Standard Telephones and Cables, Ltd., London, N.W.—Trays for Racks: Hobbies, Ltd., Dereham.—Valves W/T: Edison Swan Electric Co.,Ltd., London, W.C.—Waistcoats, Life Saving: Robinson & Cleaver, Ltd., London, W.

On a site at South Marston, Wiltshire, formerly the wartime base for manufacture of the Spitfire, Vickers were carrying out a number of diverse business activities, including the Hydraulics Division which moved in from Weymouth in the early 1960s.

This paper aims to achieve Ti-6Al-4V from Ti, Al and V elemental powder blends using direct laser deposition (DLD) and to understand the effects of laser transverse speed and laser power on the initial fabrication of deposit’s microstructure and Vickers hardness.

Two sets of powder blends with different weight percentage ratio for three elemental powder were used during DLD process. Five experiments with different processing parameters were performed to evaluate how microstructure and Vickers hardness change with laser power and laser transverse speed. Energy dispersive X-ray spectroscopy, optical microscopy and Vickers hardness test were used to analyze deposits’ properties.

This paper reveals that significant variance of elemental powder’s size and density would cause lack of weight percentage of certain elements in final part and using multiple coaxial powder nozzles design would be a solution. Also, higher laser power or slower laser transverse speed tend to benefit the formation of finer microstructures and increase Vickers hardness.

This paper demonstrates a new method to fabricate Ti-6Al-4V and gives out a possible weight percentage ratio 87:7:6 for Ti:Al:V at powder blends during DLD process. The relationship between microstructure and Vickers hardness with laser power and laser transverse speed would provide valuable reference for people working on tailoring material properties using elemental powder method.

MESSRS. Vickers (Aviation) Ltd., of Weybridge, Surrey, have recently brought out a new type of oleo‐pneumatic shock ‐ absorbing undercarriage strut. This strut is an extremely simple piece of mechanism and consists essentially of an air cylinder and a piston, the working gland between the piston and the cylinder being oil sealed to prevent air leakage. The compressed air forms the springing medium and there is an internal oil brake and rebound damper which dissipates the energy of landing and damps out oscillations.