Introduction
The Fieseler Fi 167 represents one of the most intriguing "what-if" aircraft of World War II. Designed as a carrier-based torpedo bomber and reconnaissance aircraft for the German Navy's aircraft carrier Graf Zeppelin, the Fi 167 was a remarkable machine that combined exceptional short-field performance with naval strike capabilities. Though the carrier was never completed and the aircraft never saw its intended service, the Fi 167 demonstrated innovative design solutions and impressive capabilities that make it a fascinating subject in aviation history.
Design and Development
In 1937, the German Navy (Kriegsmarine) issued requirements for a carrier-based torpedo bomber to operate from the Graf Zeppelin, Germany's first and only aircraft carrier under construction. The specification called for an aircraft capable of torpedo attack, dive bombing, and reconnaissance missions, while meeting the demanding requirements of carrier operations including short takeoff and landing distances, robust construction for arrested landings, and the ability to withstand the harsh marine environment.
Fieseler Flugzeugbau, fresh from its success with the Fi 156 Storch, approached this challenge by applying similar STOL principles to a much larger, more complex aircraft. Chief designer Reinhold Mewes and his team created a biplane configuration that incorporated many of the innovations that made the Storch legendary, adapted for the specialized requirements of naval aviation.
The resulting design featured a biplane layout with unequal-span wings, the upper wing being significantly larger than the lower. This configuration provided excellent lift at low speeds while maintaining structural efficiency. Full-span automatic leading-edge slats on both wings and large slotted flaps gave the Fi 167 remarkable slow-flight capabilities—essential for carrier operations where approach speeds needed to be as low as possible.
The fuselage was constructed using a welded steel-tube framework covered with fabric, providing strength while minimizing weight. The crew of two sat in tandem under a long greenhouse canopy that provided excellent visibility for both pilot and observer/gunner. The robust fixed landing gear featured long-travel shock absorbers similar to those on the Storch, capable of absorbing the violent impacts of carrier arrested landings.
Technical Specifications
Dimensions:
- Wingspan: 44 feet 11 inches (13.5 meters)
- Length: 38 feet 4 inches (11.4 meters)
- Height: 15 feet 9 inches (4.8 meters)
- Wing Area: 450 square feet (45.3 square meters)
Weights:
- Empty Weight: 5,830 pounds (2,800 kg)
- Maximum Takeoff Weight: 10,690 pounds (4,850 kg)
Powerplant:
- Engine: Daimler-Benz DB 601B liquid-cooled inverted V-12
- Power: 1,100 horsepower (820 kW)
Performance:
- Maximum Speed: 202 mph (325 km/h)
- Cruise Speed: 168 mph (270 km/h)
- Stall Speed: 46 mph (75 km/h)
- Takeoff Distance: 492 feet (150 meters)
- Landing Distance: 656 feet (200 meters)
- Service Ceiling: 26,900 feet (8,200 meters)
- Range: 932 miles (1,500 kilometers)
- Endurance: 10 hours (with auxiliary fuel tanks)
Armament:
- One 7.92mm MG 17 machine gun (forward-firing)
- One 7.92mm MG 15 machine gun (rear defensive position)
- One 1,102-pound (500 kg) torpedo, or
- One 2,205-pound (1,000 kg) bomb, or
- Four 551-pound (250 kg) bombs
Innovative Technical Features
STOL Capabilities: Like the Storch, the Fi 167 featured full-span automatic leading-edge slats and large slotted flaps that gave it exceptional slow-flight performance. The aircraft could operate from remarkably short distances—crucial for carrier operations where deck space was limited. The low stall speed of just 46 mph meant the aircraft could land on carriers even in light winds.
Folding Wings: For carrier storage, the Fi 167's wings could be folded manually. The upper wings folded backward along the fuselage, while the lower wings folded upward. This reduced the aircraft's width significantly, allowing more aircraft to be stored in the carrier's hangar deck.
Robust Landing Gear: The fixed landing gear featured exceptionally long-travel shock absorbers—over 16 inches of vertical movement—designed to absorb the violent impacts of carrier arrested landings. The wide track provided excellent stability during deck operations in rough seas. An arrester hook was fitted for engaging the carrier's arresting wires.
Long Endurance: With auxiliary fuel tanks, the Fi 167 could remain airborne for up to 10 hours—exceptional for a carrier-based aircraft. This gave it tremendous flexibility for long-range reconnaissance missions, anti-submarine patrols, and extended search operations.
Variants and Production
Fi 167 A-0: Pre-production series built for evaluation and testing. These aircraft validated the design and were used for carrier compatibility trials aboard the Graf Zeppelin during its fitting-out period.
Fi 167 A-1: Planned production variant with refined equipment and systems. Only a small number were completed before the carrier program was cancelled.
Total production was limited to approximately 12 aircraft, as the cancellation of the Graf Zeppelin program eliminated the need for carrier-based aircraft. The few completed Fi 167s were diverted to other roles rather than their intended carrier operations.
Operational History
The Fi 167's operational history is brief but interesting, shaped entirely by the fate of the Graf Zeppelin carrier program. Initial testing and evaluation proceeded successfully, with the aircraft demonstrating excellent handling characteristics and impressive STOL performance. Trials aboard the Graf Zeppelin during 1940 validated the aircraft's carrier compatibility.
However, construction of the Graf Zeppelin was halted in 1940 and never resumed. The German Navy's focus shifted to submarine warfare, and resources were redirected away from carrier aviation. This left the Fi 167 without its intended platform, and the small number of completed aircraft were reassigned to land-based roles.
Eastern Front Service: Several Fi 167s were sent to the Eastern Front where they served with coastal reconnaissance units. Operating from land bases, these aircraft conducted maritime patrol, reconnaissance, and anti-shipping missions over the Black Sea and Baltic Sea. Their long endurance and excellent low-speed handling made them suitable for these roles, though they were vastly overqualified for missions that could have been performed by simpler aircraft.
Experimental Use: Some Fi 167s were retained for experimental and training purposes, where they contributed to the development of carrier aviation techniques and equipment, even though Germany never operated an aircraft carrier.
Performance and Handling
Pilots who flew the Fi 167 praised its handling characteristics, particularly its docile low-speed behavior and excellent visibility. The biplane configuration provided good maneuverability, while the powerful DB 601 engine gave adequate performance for its intended missions.
The STOL capabilities were exceptional—the aircraft could take off and land in distances that would be impossible for most contemporary carrier aircraft. This would have provided significant operational advantages aboard the Graf Zeppelin, allowing operations in conditions that would ground other carrier aircraft.
The long endurance capability was particularly impressive. With auxiliary tanks, the Fi 167 could remain airborne for 10 hours—far longer than most carrier-based aircraft of the era. This would have made it valuable for long-range reconnaissance and anti-submarine patrols.
The Graf Zeppelin Connection
The Fi 167's story is inextricably linked to the Graf Zeppelin, Germany's ambitious but ultimately unsuccessful attempt to develop carrier aviation. The carrier was launched in 1938 but never completed. Work was suspended in 1940, briefly resumed in 1942, then permanently halted in 1943. The ship was scuttled in 1945 and later raised by the Soviets, only to sink while being towed to Leningrad in 1947.
Had the Graf Zeppelin been completed and entered service, the Fi 167 would have formed a key component of its air group. The aircraft's combination of torpedo attack, dive bombing, and reconnaissance capabilities would have made it a versatile strike platform. Its exceptional STOL performance would have been particularly valuable given the Graf Zeppelin's relatively short flight deck.
Comparison with Contemporary Aircraft
Compared to other nations' carrier-based torpedo bombers of the era, the Fi 167 was unique in several respects. While aircraft like the British Fairey Swordfish and American Douglas TBD Devastator were also biplanes or had similar roles, the Fi 167's STOL capabilities were exceptional. Its ability to operate from very short distances would have given it advantages in carrier operations, particularly in rough seas or light winds.
The biplane configuration was becoming obsolete by 1940, with most nations transitioning to monoplane designs. However, for carrier operations where low-speed handling and short-field performance were paramount, the biplane layout still offered advantages. The Fi 167 represented perhaps the ultimate development of the carrier-based biplane concept.
Legacy and Historical Significance
Today, the Fieseler Fi 167 is remembered as one of aviation's great "what-if" aircraft—a capable machine that never fulfilled its intended purpose due to circumstances beyond its control. The aircraft demonstrated that Fieseler's STOL expertise could be successfully applied to larger, more complex aircraft, and that exceptional short-field performance could be combined with meaningful combat capabilities.
No Fi 167s are known to survive today, making the aircraft particularly rare and interesting to aviation historians. The few photographs and technical documents that remain provide valuable insights into German carrier aviation development and the technical challenges of creating specialized naval aircraft.
For researchers and historians, the Fi 167 represents an important chapter in the development of carrier-based aviation. The aircraft's design solutions—particularly its STOL capabilities and robust construction—influenced subsequent thinking about naval aircraft requirements, even though Germany never operated carriers.
Technical Innovation
The Fi 167 incorporated several innovative features that were advanced for carrier-based aircraft of its era. The application of full-span leading-edge slats and large slotted flaps to a torpedo bomber was unusual and gave the aircraft exceptional slow-flight capabilities. The long-travel landing gear represented sophisticated engineering to handle the unique stresses of carrier operations.
The aircraft's ability to carry a full-size torpedo while maintaining excellent STOL performance demonstrated careful attention to weight distribution and aerodynamic design. The 10-hour endurance capability was exceptional and would have provided tremendous operational flexibility.
Conclusion
The Fieseler Fi 167 stands as a testament to innovative design and engineering excellence applied to specialized requirements. Though it never saw the carrier operations for which it was designed, the aircraft demonstrated that exceptional STOL performance could be combined with meaningful strike capabilities in a naval aircraft. Its story reminds us that even the most capable aircraft can be rendered obsolete by strategic decisions and changing priorities.
For aviation enthusiasts and historians, the Fi 167 represents a fascinating glimpse into German carrier aviation development and the technical challenges of creating specialized naval aircraft. The aircraft's combination of Storch-like STOL capabilities with torpedo bomber functionality created a unique machine that, had circumstances been different, might have proven highly effective in its intended role. The Fi 167 remains one of the most intriguing carrier-based aircraft never to see carrier service, a capable machine waiting for a ship that would never sail.