Boeing XP-4
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.
| XP-4 | |
|---|---|
| Boeing XP-4 during trials | |
| Role | Fighter |
| National origin | United States |
| Manufacturer | Boeing |
| First flight | 1927 |
| Number built | 1 |
| Developed from | Boeing Model 15 |
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