He also made the No. 15, a biplane with a rear-mounted rudder, as opposed to the canard format, the No. 16, a mix of airship and aeroplane, No. 17 and No. 18, a waterslide used to test the wing shape underwater.
He also made the No. 15, a biplane wit.h a rear-mounted rudder, as opposed to the canard format, the No 16, a .mix of airship and aeroplane, No. 17 and No. 18, a waterslide used to test the wing shape underwater