Dynamic response of two composite prop-fan models on a nacelle/wing/fuselage half model

Results are presented for blade response wind tunnel tests of two 62.2 cm diameter Prop-Fan (advanced turboprop) models with swept and unswept graphite/epoxy composite blades. Measurements of dynamic response were made with the rotors mounted on a simulated nacelle/wing/fuselage model, with varying tilt, at flow speeds up to 0.85 Mach number. The presence of the wing, downstream of the rotor, induced 1-P responses that were about twice those previously measured for an isolated nacelle installation. The swept blade had less 1-P response than the unswept (straight) blade. The 2-P response was significant for both blades, and was closely correlated to wing lift. Higher order response was not important for the straight blade, but possibly important for the swept blade near critical speeds, due to the proximity of the blade tips to the wing leading edge. Measurements are compared with theoretically based prediction. Correlations between calculated and measured 1-P response were good for the straight blade, and fair for the swept blade. Improvements to the calculation method were identified and implemented

The Influence of Medicine on Strategy

Any military expeditionary force, whether deployed for offensive or defensive purposes, must be prepared to manage the major and expected by-products of military action—wounded and diseased personnel

Has the Red Cross–Adorned Hospital Ship Become Obsolete?

Those responsible for casualty management in littoral conflicts must weigh multiple variables such as: the enemy’s war-fighting strategies and tactics; the types of weapons systems used by the enemy; the complexity of the kinds of wounds and diseases commonly encountered during armed conflict; and the availability of resources to effectively treat those conditions

RECENT DEVELOPMENTS IN PATENT LAW

The framers of the Federal Constitution shared with Thomas Jefferson his wish to see new inventions encouraged, and old ones brought again info useful notice. Their concern for the public welfare caused many, including Jefferson, to question the wisdom of using a limited monopoly to encourage such inventions

Can We Effectively Control Human Costs during War at Sea?

Despite increasingly more sophisticated naval weaponry and the greater use of automation in military systems, we remain heavily dependent upon competent human assets to facilitate combat operations. History has repeatedly demonstrated, however, that the human costs of naval warfare can be substantial! The saving of lives in close support of combat can thus contribute significantly to a navy\u27s effectiveness

The “Triangle of Death”—Medical Sustainability in Expeditionary Sea-Based Operations

Sea bases and the joint forces operating from them must be ready for numerous and severe casualties—and yet they will neither possess nor be close to sophisticated medical resources. Without timely delivery of care, the result is increased mortality and morbidity of combat casualties. How will the sick and combat wounded receive proper treatment

The Mosquito Can Be More Dangerous than the Mortar Round

These words, penned in 1943 by the commander in chief of British forces in Burma during World War II, underline the reality that losses to malaria and other preventable diseases among Allied forces operating in the China-Burma- India theater far exceeded the number of casualties inflicted by enemy action.1 Today, as the global war on terrorism evolves, a similar failure to appreciate noncombat environmental threats—including mosquitoes and other disease- carrying insect vectors—will once again degrade combat effectiveness of deployed forces