Ryan X-13 Vertijet: This Plane Helped Create a Special Version of the F-35
The Ryan X-13 Vertijet was small and weighed only 7,200 pounds. It would win no speed records, as this aircraft could only do 350 miles per hour. A Rolls Royse Avon engine gave it 10,000 pounds of thrust with a short ceiling of 20,000 feet.
Source: nationalinterest.org