This research studies of crushed oyster shell (OSP) as a substitution for cement in producing the interlocking block. Research process are design the mixtures which contain 0 10 20 30 40 and 50%. Control water at optimum moisture content (OMC). Results of the tests the compressive strength at 7 14 28 60 90 days and the moisture absorbed at 28 days showed that increasing the amount of OSP decreased compressive strength and increased water absorption. By using OSP to replace cement 10% 20% passed the community product standard 602/2547 these were classified as non-load supportive type

Four core helicopter project (Con Rotor) that coordinates with a GPS unit with a survey prepared for aerial photography and GPS positioning system with GPS and the flight logs with GPS. Making helicopter 4 cores with GPS coordinates tell this from a detailed study of helicopters and other equipment Axis 4 (Con Rotor) study of a GPS system microcontroller. By applying a helicopter and make a 3-core microcontroller. The result of doing this project is. Four core helicopter with GPS coordinates that can shoot air and signaling devices to the receiver and lock position without flying via remote control.