1. The first conversion to horizontal flight took place on 5 November 1954. 2. The GL-10 performed transitions between vertical and horizontal flight in 2015. 3. The nozzles point rearward with the lever in the forward position for horizontal flight . 4. Parviainen achieved approximately 30 seconds of horizontal flight with no noticeable loss of altitude. 5. Rockets would assist the aircraft to transition to horizontal flight . 6. When fuel was added, the auxiliary combustion chambers acted as primitive afterburners providing horizontal flight . 7. The first transition from hovering flight to horizontal flight took place on 20 September 1963. 8. E1 was powered only by the Pegasus engines, and was designed to test horizontal flight . 9. Two prototypes were made, both flew, made successful transitions to and from horizontal flight , and landed. 10. On 6 April 1960, the first in-flight transition between vertical and horizontal flight was successfully conducted.
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