Boeing-Stearman Model 75 Kaydet
13 models built 1940–1945 · 1,578 on the US register today
The Boeing-Stearman Model 75 Kaydet, the wartime primary trainer built in thousands and sold off cheaply after the war to become the definitive cropduster: an open-cockpit biplane with two tandem seats, a steel-tube fuselage and wire bracing. All share one airframe on type certificate A-743; the designations encode the engine — A75N1 (PT-17) with the Continental R-670, B75N1 (N2S-3), E75 (PT-13D/N2S-5) with the Lycoming R-680, A75J1 with a Jacobs, and the L3/L300 suffixes for Lycoming conversions including the 300 hp cropdusting engine.
The variants
| MODEL | YEARS | ACTIVE | TAILFAX SCORE | WHAT CHANGED |
|---|---|---|---|---|
| A | 1940–1945 | 0 | — | Registry spelling of the Model 75 without suffix |
| A75 | 1940–1945 | 93 | Partial 6.2/30 | Base Model 75 |
| A75J1 | 1940–1945 | 2 | — | PT-18: Jacobs R-755 |
| A75L3 | 1940–1945 | 32 | Partial 3.2/30 | Lycoming R-680 conversion |
| A75L300 | 1940–1945 | 33 | — | 300 hp Lycoming cropdusting conversion |
| A75N1 | 1940–1945 | 59 | Partial 5.8/30 | PT-17: Continental R-670 |
| A75N1(PT17) | 1940–1945 | 760 | 21.9/50 | PT-17 spelling |
| B75 | 1940–1945 | 15 | — | N2S-2: Lycoming R-680 |
| E75L300 | 1940–1945 | 1 | — | 300 hp Lycoming conversion of the E75 |
| B75N1 | 1942–1944 | 241 | 21.6/50 | N2S-3: Continental R-670 |
| E75N1 | 1942–1945 | 79 | — | E75 with Continental engine |
| E75 | 1943–1945 | 261 | 22.6/50 | PT-13D / N2S-5: Lycoming R-680-17 |
| E75(N2S-5) | 1943–1945 | 2 | — | N2S-5 spelling |
Family fleet, active
1,578
FAA registry
NTSB events / 1,000, 10 yrs
48.2
76 events over 1,578 active aircraft, pooled across the family
Data as of: FAA registry Sep 28 · NTSB Oct 2 · scores Sep 30