The flying pencil: how a rejected mail plane became a legendary German bomber
In short: Designed in the 1930s as a high-speed mail plane, the Dornier Do 17 was initially rejected for being too cramped and costly. After a pilot demonstrated its agility, the design was repurposed into a formidable bomber, earning the nickname flying pencil for its sleek, narrow fuselage and impressive combat versatility.
The Do 17 originated from a 1932 specification for a high-speed mail plane and freight aircraft. When the initial design failed to impress commercial operators, a test pilot named Untucht famously remarked that the machine was as nimble as a fighter. This observation prompted Dornier to redesign the tail and pivot toward a military role. By 1934, the first prototype, the Do 17 V1, took flight. Although it initially featured a single vertical stabilizer, flight tests revealed stability issues, leading to the adoption of the iconic twin-tail configuration seen in subsequent models.
Combat experience during the Spanish Civil War in 1937 proved vital to the aircraft's evolution. Pilots discovered that the bomber was not as invulnerable to enemy fighters as previously assumed. In response, designers introduced the Kampfkopf, or battle head, a redesigned, spacious cockpit that improved visibility and defensive capabilities. This included the Bola, an under-nose gondola that allowed for better placement of defensive machine guns. These modifications, alongside the aircraft's handling at low altitudes, made it a popular choice among Luftwaffe crews throughout the early stages of the Second World War.
Despite its popularity, the Do 17 faced constant engine supply challenges. High-performance Daimler-Benz engines were frequently diverted to fighter production, forcing the use of Bramo 323 radial engines. While these provided reasonable performance, they limited the bomber's range and bomb load. By mid-1940, production ceased in favor of the more powerful Junkers Ju 88 and Dornier Do 217. Nevertheless, the Do 17 remained in service until the end of the conflict, transitioning into secondary roles such as training, research, and glider towing, proving its adaptability long after its frontline days had passed.
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- Summary by Intellect · source: Dornier Do 17
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