When individuals mention French aviation they will envision glamorous airplanes and technological advancements in engineering. France has been reputed to make innovative and successful designs that contributed to the creation of modern aviation. Due to such a good legacy, it is not as easy to locate really bad aircraft that belonged to France as it could be the case with other countries that have longer lists of failures.

But, as you find out more about history, you start to see a different picture. Although France did not create a lot of outright disasters, the few failures that it has created are memorable. They are not only flawed but also weird, ambitious, and even dangerously misguided machines that have proven to fail in intriguing ways, which can be of great value in terms of aviation design and experimentation.

1. Blériot 125

The Blériot 125 is also a reminder that even legendary pioneers can fall on their feet when they go too far. This aircraft was designed based on the success of the earlier plane of Louis Blériot, but it had a very unusual design where the cabins of the passengers were accommodated in two different fuselage. Although it appeared to be a fantastical and futuristic design, the design was not practical and posed great aerodynamic problems.

Major Problems of Blériot 125

• Dual fuselage posed too much drag
• Underpowered Hispano-Suiza engines
• Uncontrollable in flight tests
• Inefficient rudder design
• Did not join commercial service

The aircraft did not work as expected regardless of years of work. Its engines were not as powerful to take such a complicated structure and it was not easy to steer it because of control problems. Having tried and changed many unsuccessful projects, the project was given up leaving a remarkable example of ambition that went beyond practical engineering.

2. Mignet HM.14 Pou du Ciel (Flying Flea)

The Flying Flea was made with a noble purpose to enable ordinary people to fly. It was designed by Henri Mignet as simple, cheap, and flyable without complicated controls and made the plane easier to use. Initial prototyping indicated that the idea could be a success, and it created a wave of excitement among amateur constructors.

Major Problems of Flying Flea

• Absence of old fashioned control systems
• Fatal aerodynamic instability
• Failure to rebound after dives
• Multiple fatal accidents
• Later outlawed by the government

This optimism however, became a tragedy. There was a death defying design flaw that made the aircraft lose control in some circumstances, especially when making dives. When the number of accidents rose, the government intervened to land the plane. What started as a promising new technology turned into a warning of the need of rigorous experimentation.

3. Dassault Balzac / Mirage III-V

Balzac and Mirage III-V project came out of a radical idea to design a vertical take-off supersonic fighter. Due to military requirements in the Cold War, the design was inspired to integrate speed and flexibility to enable aircraft to work within small areas. Nevertheless, the intricacy of the idea presented a lot of technical difficulties.

Important Problems of Balzac / Mirage III-V

• Complex multi engine configuration
• Inadequate stability on the vertical flight
• High maintenance requirements
• Short range and payload
• Crashes during testing

The aircraft never managed to transcend its fundamental limitations, despite several efforts to improve the design. It was inefficient and hard to maintain due to the dependence on many engines. The project was later cancelled after crashes and constant problems proving that even ambitious ideas with no practicality fall through.

4. Nieuport Delage NiD 37 Type Course

NiD 37 Type Course was an experimental racing aircraft that was an unusual design philosophy. Its inventor had faith in the idea of the sesquiplane that had proved successful in previous fighter aircraft but was less efficient in this case. The unusual design of the aircraft was aesthetically appealing but was also flawed in design.

Major Problems with NiD 37 Type Course

• Inefficient wing configuration
• Poor lift performance
• Overheating engine components
• Dangerous cockpit placement
• Failed to achieve take-off

The aircraft had trouble taking off during testing even after several tries. The mechanical problems later caused a fire that compelled the pilot to give up the exercise. The project brought out the fact that designs which are successful in one setting may not translate well in another setting, particularly when taken to their limits.

5. Simplex-Arnoux

The Simplex-Arnoux was an effort to design a high speed racing airplane in a tailless design. Although the idea was innovative, the implementation of the same led to a machine that was very hard to control. The size of its wing and strange design made visibility and handling a problem, which made it not only uncomfortable to fly, but also dangerous.

Simplex-Arnoux Has Some Important Problems

• Lack of visibility to the pilot
• Ineffective control response
• Overheating of cockpit
• Dangerous flight behaviour
• Crashed during testing

Even seasoned pilots found it hard to control this plane and its imperfections became evident in the shortest period possible. In one of the test flights, the aircraft crashed and the pilot was seriously injured. This accident proved that the design was flawed in the core and it showed that innovation should be always reasonable and well-weighed with safety and practicality.

6. Antoinette Monobloc

The Antoinette Monobloc was a bold move to take the aviation industry a step further in the design. It also developed new technologies like cantilever wings and streamlined construction which were way ahead of its time. Paperwise, it was an invention that could transform aircraft design.

There are a few problems with Antoinette Monobloc

• Excessive weight for its engine
• Insufficient power output
• Overly complex design
• Failed to achieve lift
• Brought to the collapse of the company

Regrettably, the advanced features of the aircraft were obtained at the expense of the weight increase. The engine that was available was not powerful enough to sustain the design and thus it was not able to take off. The failure of it had a grave effect, and it led to the failure of the company which developed it.

7. Spad S.A

The Spad S.One of the most unusual and dangerous early military aviation designs was a featured one. In the quest to address the issue of shooting through a propeller, the engineers put the gunner in a pod that was at the front of the aircraft. Although this appeared to be rational, it posed severe safety hazards.

The main Problems of Spad S.A

• Very high risk gunner position
• Structural instability of pod
• Ineffective inter crew communication
• During landings, high risk.
• Disliked by pilots in general

The planes became known as unsafe as the gunner was left in a very vulnerable position. It was not popular with pilots due to structural failures and poor design, which eventually ended its service. It is still a case of how one problem can lead to a myriad of problems.

8. Bloch MB.150

The Bloch MB.150 had a basic problem at the onset; it was not a good flyer. The initial prototypes did not succeed in taking off, and engineers had to redesign the aircraft within time constraints. Later versions were able to fly, but they could not perform at the required level.

The major Problems with Bloch MB.150

• The first failure to take off
• Required extensive redesign
• Underwhelming performance
• Poor aerodynamics
• Limited combat effectiveness

The aircraft were still average even after the improvements. It was not as fast and agile as the rivals needed to be in the case of a war. Although it had been found to be sturdy in battle, its performance generally cost it its victory, and the price of early design faults.

9. Potez 630 and 631

Potez 630 series was developed as a heavy fighter that can make long distance missions. Nevertheless, it had a debilitating weakness, as it was overloaded. This rendered it slower than even the very bombers which it was designed to intercept, highly impairing its usefulness in battlefield scenarios.

Critical Problems of Potez 630/631

• Insufficient engine power
• Weak in speed compared to the enemy aircraft
• Mistaking design resemblance to enemy aircraft
• Vulnerable in combat
• The cases of friendly fire

To make matters worse, the aircraft was very similar to enemy planes which caused confusion during the battle. This led to cases of friendly fire, which made it even less effective. The Potez 630 is a good example of how a case of misjudgment in design can have severe consequences in real life.

10. Loire 102

The Loire 102 was a grand flying boat which was meant to transport over the oceans. Its size and unusual engine layout made it a visual delight but the same characteristics caused serious technical issues that were hard to fix.

The Main Problems with Loire 102

• Complex engine arrangement
• Severe vibration issues
• Directional instability
• Poor flight performance
• Never entered service

The strange engine combination made the plane unstable and vibrating at all times, thus making it very hard to control. These problems were not resolved despite the attempts to solve them. In due course the project was not completed and the Loire 102 was forgotten as yet another monument of ambitious design.