The Schweizer brothers were concerned that their father might not let them fly the glider when it was completed and so they built it in secret. Their father worked in New York City during the week and would only enter his barn on weekends. The glider was constructed during weekdays and dismantled and hidden on the weekends. At the point in construction when the aircraft parts had become too large to hide, the brothers decided to assemble the aircraft as far as they could and show their father. He saw that they had done too much work to be stopped at that point and did not object to the completion of the glider.
