A piloted simulation study of the handling characteristics of the B.A.C. 221 aircraft in the approach configuration was made in preparation for the first flight of the aircraft. The simulation included a simpli~ed representation of the outside visual world, and cockpit motion in pitch and roll. Values of the aircraft's lateral derivatives and moments of inertia were varied to allow for uncertai...

With the aid of a new research facility, transient pressures have been measured on the upper surface of a narrow-delta wing when it entered a sharp-edged gust normal to the wing plane. This paper describes the facility and presents an analysis of the results of six runs through the gust by one model. It is shown that the pressure distribution on any particular cross-section of the wing remains ...

We examined the function of secreted forms of the two known Drosophila Notch ligands, DELTA and SERRATE, by expressing them under various promoters in the Drosophila developing eye and wing. The phenotypes associated with the expression of secreted Delta (DlS) or secreted Serrate (SerS) forms mimic loss-of-function mutations in the Notch pathway. Both genetic interactions between DlS or SerS tr...

The wing rock phenomenon is a high angle of attack aerodynamic motion manifested by limit cycle roll oscillations. Experimental studies reveal that direct control and manipulation of leading edge vortices, through the use of ‘blowing’ techniques is effective in the suppression of wing rock. This paper presents the design of a robust controller for the experimental implementation of one such ‘bl...

The effectiveness of steady and pulsed blowing as a method of controlling delta wing vortices during ramp pitching has been investigated in flow visualization experiments conducted in a water tunnel. The recessed angled spanwise blowing technique was utilized for vortex manipulation. This technique was implemented on a beveled 60° delta wing using a pair of blowing ports located beneath the vor...

The Lyra mutation was first described by Jerry Coyne in 1935. Lyra causes recessive pupal lethality and adult heterozygous Lyra mutants exhibit a dominant loss of the anterior and posterior wing margins. Unlike many mutations that cause loss of wing tissue (e.g., scalloped, Beadex, cut, and apterous-Xasta), Lyra wing discs do not exhibit increased necrotic or apoptotic cell death, nor do they s...