All aircraft need pitot tubes to measure airspeed. The tip of the nose is the ideal place to install pitot tubes since this place has the cleanest uninterrupted airflow. This trend has, however, fallen out of favor for production aircraft as this arrangement is in conflict with the nose radar. For the J-36 prototype, which values the accuracy of the airspeed data it collected and most likely does not have a functional radar installed yet, installing the pitot tube at nose tip is the most logical choice