The invention refers to a pyrotechnic latch retraction mechanism that can be applied to various types of flying devices. The main structure of this mechanism includes piston-cylinder assembly, electric ignition assembly and guide assembly. The solution described in this invention not only makes the exploitation, use and preservation of equipment more convenient, reduces difficulties, prevents risks and saves costs, but also ensures safety and security, reliability during device operation.

The invention refers to a pyrotechnic latch retraction mechanism that can be applied to various types of flying devices. The main structure of this mechanism includes piston-cylinder assembly, electric ignition assembly and guide assembly. The solution described in this invention not only makes the exploitation, use and preservation of equipment more convenient, reduces difficulties, prevents risks and saves costs, but also ensures safety and security, reliability during device operation.

A downhole tool includes a compact heat source including an inner housing having thermal insulation. The compact heat source includes an electrically activated heat source disposed in the inner housing and configured to receive electrical energy to generate first thermal energy. Additionally, the compact heat source includes active metal exothermic materials disposed in the inner housing and configured to receive the first thermal energy from the electrically activated heat source to initiate a first exothermic reaction in the active metal exothermic materials that generates second thermal energy. Further, the compact heat source includes a thermite material disposed in the inner housing. The thermite material is configured to receive the second thermal energy from the first exothermic reaction and ignite a second exothermic reaction of the thermite material to generate third thermal energy. Additionally, the compact heat source is configured to output the third thermal energy out of the inner housing.

A projectile including: a body having an internal space; and a mechanical stepper motor disposed in the body, the mechanical stepper motor including: a shuttle having one of a plurality of pockets and movable pins offset from each other with a first spacing; a body portion having the other of the plurality of pockets and movable pins offset from each other with a second spacing, where the first spacing is different from the second spacing; and actuation means for engaging at least one of the movable pins into a corresponding pocket to step one of the shuttle and body portion a predetermined linear and/or rotary displacement; wherein the mechanical stepper motor outputs the predetermined linear and/or rotary displacement to an actuated device operatively connected to the shuttle.

A wellbore select fire switch retaining member system and method with an integrated through wire and ground wire in a switch sub. The system/method includes a retaining member that has a form factor acceptable by a conventional switch sub. The retaining member incorporates an electrical connection to the center pin of a pressure switch. The system further includes a secondary piston aligned with a piston in the switch (switch piston) so that external pressure is fully acted upon the entire switch piston creating a reliable switch connection. Another system includes an integrated retaining member and switch module having a form factor compatible with existing switch subs. The integrated module inputs include a ground wire and a through wire and the outputs include a ground wire, through wire and an arming wire.

According to one aspect, a method of releasing a fan blade for testing a turbofan engine includes providing an internal passage with a constant arc through an airfoil arranged about a blisk such that the constant arc of the internal passage aligns with a contour of the blisk. The method further includes packing the internal passage with a charge, modifying the airfoil such that the airfoil is released from the blisk evenly along a chordwise length of the airfoil, and detonating the charge such that the airfoil is released from the blisk at a selected time.

A pyrotechnic gas generator for driving an actuator includes a body defining a combustion chamber housing a main pyrotechnic charge, and an ignitor for initiating combustion of the main pyrotechnic charge. The pyrotechnic gas generator includes at least one delay chamber adapted to communicate with the combustion chamber via at least one inlet orifice, and the delay chamber is provided with at least one outlet orifice for passing gas out from the gas generator. The at least one outlet orifice is provided with a seal adapted to pass from a closed state to an open state when the pressure inside the delay chamber reaches a rupture limit pressure.

A shaped charge pipe cutter is constructed with the cutter explosive material packed intimately around an axially elongated void space that is continued through a heavy wall boss portion of the upper thrust disc. The boss wall is continued to within a critical initiation distance of a half-cuter junction plane. An explosive detonator is positioned along the void space axis proximate of the outer plane of the upper thrust disc. Geometric configurations of the charge thrust disc and end-plate concentrate the detonation energy at the critical initiation zone.

An active bolt release arrangement includes a nut having nut portions adapted for radial movement, a sleeve part encircling the nut and having contact portions in contact with the nut portions in order to prevent the nut portions from radial movement, and a pyrotechnical actuator. The pyrotechnical actuator is adapted for, upon deployment, moving the sleeve part relative to the nut to a released position forming a release space allowing radial movement of the nut portions. The pyrotechnical actuator is arranged for turning, upon deployment, the sleeve part a predetermined rotational distance to the released position, such that radial movement of the nut portions by formation of the release space is allowed, thereby causing release of a bolt connected to the bolt release arrangement.

A downhole explosive detonation assembly with a high voltage electro-explosive initiator having an input high voltage power supply with a low impedance shunting fuse, a flexible electrical link and a capacitor discharge unit. The explosive detonation assembly is adapted to detonate detonating cord from the side.