Overview
The Boeing XP-4 was a prototype American biplane fighter of the 1920s. It was grounded permanently after just 4.5 hours of flight testing.
Specifications
Figures are compiled from public sources and may be approximate; they can vary by variant and configuration.
Photos
Photo 1: skinnylawyer from Los Angeles, California, USA / Wikimedia Commons · CC BY-SA 2.0
Some text and images come from Wikipedia / Wikimedia Commons under CC BY-SA licences. Source
