A variable-structure control system designed to enable a fuselage-heavy airplane to recover from spin has been demonstrated in a hand-launched, instrumented model glider airplane (see figure). It has long been known that the most effective spin recovery technique for fuselage-heavy aircraft involves the use of ailerons to roll the airplane into the spin. This technique might be considered count...

The I \ ~ . C . ~ has delleloped means, including an injection impeller and ducted head h f l e s , to improre the cooling charact ee t i c s of the SS60-cubieinchdisplacement radial engines installed in a four-engine h a z y bomber. The improrements afforded proper cooling of the rear-row exhaust-ualre seats for a wide range of ~(~101-jhp angles, mixture strength, and airplane speeds. The resu...

Gaspers installed in commercial airliner cabins are used to improve passengers' thermal comfort. To understand the impact of gasper airflow on the air quality in a cabin, this investigation measured the distributions of air velocity, air temperature, and gaseous contaminant concentration in five rows of the economy-class section of an MD-82 commercial aircraft. The gaseous contaminant was simul...

An analysis of ight measurements made near a wake vortex was conducted to explore the feasibility of providing a pilot with useful wake-avoidance information. The measurements were made with relatively low-cost ow and motion sensors on a light airplane ying near the wake vortex of a turboprop airplane weighing approximately 90 000 lb. Algorithms were developed which removed the response of the ...

While injuries to the spine after an airplane crash are not rare, most crashes result in fatal injuries. As such, few studies exist that reported on spine fractures sustained during airplane accidents. In this report, we demonstrate three cases of spine fractures due to crash landing of a commercial airplane. Three passengers perished from injuries after the crash landing, yet most of the passe...

Schlieren imaging in wind-tunnels is extensively utilized to study the effects of air on an airplane surface. One of the interesting subjects for research is to study the effects of speed change on the airplane surface. Speed change results in occurrence of shock waves, which are visualized as lines on Schlieren images. In this paper, we study the problem of detecting speed of a plane after occ...

Let M be a complete, connected, two-dimensional Riemannian manifold. Consider the following question: Given any (p1, v1) and (p2, v2) in T M , is it possible to connect p1 to p2 by a curve γ in M with arbitrary small geodesic curvature such that, for i = 1, 2, γ̇ is equal to vi at pi? In this article, we bring a positive answer to the question if M verifies one of the following three conditions:...

This paper describes a modelling approach to the dynamics of the airplane flight aimed at designing and realizing a simple but realistic ‘‘flight simulator,’’ able to mimic the longitudinal behaviour of a real airplane. The model is implemented by using the Interactive Physics simulation environment. The simulator is used to reproduce all the phases of a complete flight of a light commercial ai...