Tags: Aircraft.
The Boeing XP-4 was a prototype United States biplane fighter of the 1920s that was grounded permanently after just 4.5 hours of flight testing.
Loading...
This page contains content from the copyrighted Wikipedia article "Boeing XP-4"; that content is used under the GNU Free Documentation License (GFDL). You may redistribute it, verbatim or modified, providing that you comply with the terms of the GFDL.