INTRODUCTION Neck pain is a widespread health problem in the skydiver athlete population, epidemiologically linked to repeated exposure to parachute opening shock (POS). During POS, a parachutist is subjected to considerable deceleration forces. This study aims to evaluate the use of preventive free fall acrobatics to reduce the biomechanical load on the neck of parachutists during parachute op...

Tragopogon pratensis is a small herbaceous plant that uses wind as the dispersal vector for its seeds. The seeds are attached to parachutes that increase the aerodynamic drag force and increase the total distance travelled. Our hypothesis is that evolution has carefully tuned the air permeability of the seeds to operate in the most convenient fluid dynamic regime. To achieve final permeability,...

Parachute transplanting method of rice as compared to line transplanting and farmer’s method of random transplanting was studied at 10 different locations viz., Kamonki, Wazirabad, Daska, Pasroor, Gujranwala, Sialkot, Lahore, Hafizabad and Sheikhupura during 2003 and 2004. Super Basmati was used as test variety. Yield and yield components of three transplanting techniques, averaged across 10 lo...

Small-scale sensor packages and parachutes manufactured for model rocket recovery were handdropped from within a building in order to gain familiarity with the descent kinematics of a planetary probe through an atmosphere. A number of parachute-probe systems ranging in size, shape, weight, riser length, and sensors were dropped while exterior video cameras and onboard sensor data were collected...

Abstract. The project aims to characterize the unsteady dynamics of parachute-capsule in a supersonic flow during descent phase on planetary entry. Presently, Large-Eddy Simulation combination with an Immersed-Boundary Method is employed analyze time-evolving rigid parachute trailing behind reentry capsule through Mars atmosphere. simulated at Ma = 2 and Re 106. A massive GPU parallelization al...

Parachutes and other inflatable aerodynamic decelerators usually use flexible fabrics due to their lightweight high load-carrying capacity. The behavior of during complex deformations is mainly influenced by shear properties. properties fabric can be explained the stiffness or modulus. design optimization these structures relies on a detailed knowledge mechanical material. To investigate effect...

Aim. The purpose of this research was to estimate the influence of parachute jumps on the level of corticotropin (ACTH) and cortisol hormones among professional soldiers from air-borne forces. Method. The study was carried out on 46 professional soldiers from 16 Air Borne Battalion, patients of Outpatient Department – SPZOZ JW. 4495 males, at the age of 20 to 45, healthy – admitted to parachute...

A parachute simulation environment (PSE) has been developed that aims to take advantage of legacy parachute simulation codes and modern object-oriented programming techniques. This hybrid simulation environment provides the parachute analyst with a natural and intuitive way to construct simulation tasks while preserving the pedigree and authority of established parachute simulations. NASA curre...

INTRODUCTION This study examined the injury prevention effectiveness of the parachute ankle brace (PAB) while controlling for known extrinsic risk factors. METHODS Injuries among airborne students who wore the PAB during parachute descents were compared with injuries among those who did not. Injury risk factors from administrative records included wind speed, combat loads, and time of day (da...

Parachute opening shock tests were conducted with an instrumented test manikin to measure and record transmitted neck loads. The standard paratrooper helmet, as well as two developmental helmet systems, were fitted to the manikin head. These two systems alter the headborne weight and center of mass from the standard helmet, potentially increasing the risk of acute neck injury during parachute o...