Abstract: A device for producing a stream of vapor for wind tunnel airflow visualization is described. An electrically conductive heating tube is used to resistively heat a vapor producing liquid. The heating and delivery systems are integrated to allow the device to present a small cross section to the air flow, thereby reducing disturbances due to the device. The simplicity of the design allows for inexpensive implementation and construction. The design is readily scaled for use in various wind tunnel applications. The device may also find uses in manufacturing, producing a vapor for deposition on a substrate.

Abstract: An apparatus is disclosed for arresting uncontrollable motions of model araft. A signal is used to deploy a parachute when a model aircraft is in a motion, such as a tailspin, from which the operator cannot recover by manipulating the flight surfaces. After the model aircraft has been stabilized to a point where the operator can arrest the uncontrollable motion the parachute is jettisoned and normal flight resumed. The deploy and jettison signals may be sent using a single channel of a multi-channel transmitter and are completely independent of each other.