Abstract: An electrical circuit arranged in a half bridge topology. The electrical circuit includes a high side transistor; a low side transistor; a gate driver and level shifter electrically coupled to a gate of the high side transistor; a gate driver electrically coupled to a gate of the low side transistor; a capacitor electrically coupled in parallel with the gate driver and level shifter; a voltage source electrically coupled to an input of the gate driver and level shifter and an input of the gate driver; and, a bootstrap transistor electrically coupled between the voltage source and the capacitor. A GaN field-effect transistor is synchronously switched with a low side device of the half bridge circuit.

Abstract: The present disclosure is generally directed to a composite trailing edge control surface including a contiguous one-piece composite control surface skin wrapped around a plurality of stiffening cores, a plurality of hinge fittings, and a plurality of substantially parallel ribs. The contiguous one-piece composite control surface skin provides a control surface on opposing sides of the trailing edge control surface and substantially distributes bending, shear and torsion loads of the trailing edge control surface to the plurality of hinge fittings and the plurality of substantially parallel ribs. A method of manufacturing the trailing edge control surface includes positioning a contiguous one-piece composite control surface skin on a substantially flat tool.

Abstract: An electrical circuit arranged in a half bridge topology. The electrical circuit includes a high side transistor; a low side transistor; a gate driver and level shifter electrically coupled to a gate of the high side transistor; a gate driver electrically coupled to a gate of the low side transistor; a capacitor electrically coupled in parallel with the gate driver and level shifter; a voltage source electrically coupled to an input of the gate driver and level shifter and an input of the gate driver; and, a bootstrap transistor electrically coupled between the voltage source and the capacitor. A GaN field-effect transistor is synchronously switched with a low side device of the half bridge circuit.

Abstract: A blade stringer for a composite panel having an inside surface includes a proximal section, comprising a web attached to and extending approximately perpendicularly from the inside surface of the panel, and a free distal end. The web has a thickness and a height, and includes a plurality of continuous composite plies. The free distal end has a plurality of local plies interleaved and co-cured with the continuous plies, the distal end defining a bulb having a thickness that is greater than the web thickness and less than about a third of the web height.

Abstract: An accurate and compact flap skew detection system that operates independent of the flap-drive system comprises, in a preferred embodiment, three major elements; a rotary position sensor located on fixed wing structure; a push-pull link and crank arm to convert translational flap motion into rotary sensed motion at the sensor; and a computer processing means to process the rotational sensed information and to compute a flap skew algorithm. Inter-flap and intra- flap translational motion is sensed and compared using a plurality of rotary sensors. Sensors falling outside of predetermined limits or violating control law rules indicate a non-synchronous or asymmetrical “skewed” condition.

Abstract: A pylon (70) on one structure (68) abuts a side surface of a mounting flange (64) carried by another structure (60) and is bonded thereto by an adhesive layer (76). A flattened tube (78) is positioned between pylon (70) and flange (64). Explosive cords (82) are detonated inside tube (78) to expand tube (78) to a rounded configuration. This causes pylon (70) to peel away from flange (64) and to peel adhesive layer (76) to thereby release structures (60,68) from each other. In another embodiment, a structure (4) has a wall (6) including an outer skin (8), an inner skin (10), and a honeycomb core (12). Outer end portions (14,20) of skins (8,10) form two mounting flanges that are bonded by adhesive layers (40,42) to opposite surfaces of a mounting flange (32) carried by another structure (28). Detonation of explosive cords (50) inside two expandable members ( 46,46') causes skin flanges (14,20) to peel away from flange (32) and peel layers (40,42).