LAPCAD Engineering was founded in 1988
Twin Propeller Attitude Control (TPAC). PATENT PENDING
See us at the RCX Exhibit Costa Mesa, May 17-18, 2014.
The Twin Propeller Attitude Control (TPAC) Air Vehicle functions similarly to a quadcopter. It has two electric motors each developing about two horse power, resulting in a total max thrust of 16-20 lbs. The UAV utilizes a hybrid stabilization system, that needs only two motors in order to achieve full control of altitude, pitch, roll and yaw. Pitch control is achieved by means of differential thrust, while roll and yaw control is via thrust vectoring.
The total weight is approximately seven pound, making for an acceleration factor of nearly 3G.
The horizontal max velocity is estimated at around 50 MPH. Several attachment points are available for mounting cameras, additional batteries and sensors. An FPV camera can be mounted either in front or on top of the nacelle. The max payload is around two pounds.
All non-metallic parts are printed in plastic. All tubular components are made from aircraft quality 6061-T6 Aluminum.
The control system includes a six channel receiver connected to the SPARKFUN UDB5 microcontroller. The firmware is the open source MatrixPilot 4.0 partly adapted to this type of vehicle. Heading hold works similar to a helicopter. Heading is changed by applying rudder. Once the rudder stick is centered this new heading is maintained.
Exterior dimensions are approximately:
Length: 30 inch
Width: 20 inch
Height: 10 inch
The vehicle is ready to fly, including electronic speed controllers, batteries and a six channel JR transmitter.
Recommended age for use of this vehicle is at least eighteen years, and the operator needs to have experience flying larger model helicopters or drones.
The following is a link to an interview that took place January 12, 2014, at the Ontario Convention Center outside of Los Angeles, in the AMA 2014 Model Expo. The Roswell test team came to LAPCAD’s booth and became interested in the TPAC UAV.