The Design and Engineering of Curiosity by Emily Lakdawalla

Author:Emily Lakdawalla
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

4.7.3 Scarecrow

Scarecrow is a second engineering model of the rover. It consists of a full-scale mobility system connected to a small body containing batteries and electronics. The whole model has a mass of 340 kilograms, or 3/8th of the mass of the flight rover, so that it exerts the same ground pressure on Earth that Curiosity does on Mars. Its name derives from the character in The Wizard of Oz: Scarecrow doesn’t have a brain. It does have force and torque sensors in its axles to measure wheel loading under Mars gravity. It can report motor current as well as roll, pitch, and yaw using onboard inertial measurement unit, much as the actual rover can. It has ultrasonic range finders on each wheel to measure sinkage.46 It is used primarily to test how well the rover traverses different types of terrain (Figure 4.26).

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