During World War II, the typical temperature inside an airplane cabin, especially at high altitudes, could be extremely cold, often reaching temperatures as low as -40°F to -60°F (-40°C to -51°C). Aircraft of that era were not pressurized or heated in the way modern planes are, leaving crew members exposed to freezing conditions during missions.
Reasons for the Extreme Cold:
Unpressurized Cabins:
Most aircraft, including bombers and fighters, were not pressurized, meaning the temperature inside the cabin closely mirrored the frigid external conditions at high altitudes (20,000–35,000 feet).
Lack of Insulation:
Aircraft had minimal insulation to save weight and space, offering little to no barrier against the cold.
High Altitude Operations:
Missions often required flying at altitudes where air temperatures plummet, such as during bombing raids or reconnaissance missions.
Improvements Made to Help the Crew:
During the war, several innovations and adjustments were introduced to mitigate the extreme cold and make long flights more bearable and survivable for aircrew:
1. Electrically Heated Clothing:
Pilots and crew were provided with electrically heated flight suits, gloves, and boots that used wires embedded in the fabric.
These were powered by the aircraft's electrical system and provided warmth to critical areas of the body.
2. Oxygen Masks with Heaters:
As cold air combined with high altitude could freeze oxygen masks, some were fitted with heaters to ensure the oxygen supply remained usable.
3. Aircraft Heating Systems:
Larger aircraft, such as bombers (e.g., B-17 Flying Fortress, B-24 Liberator), were equipped with basic heating systems. These systems often redirected heat from the engine exhaust or used combustion heaters.
These systems were not always reliable or efficient, often leaving some crew stations unheated.
4. Improved Insulation:
Late-war aircraft designs included slightly better insulation and sealing to reduce heat loss. However, weight constraints meant insulation was still minimal.
5. Cockpit Design:
Fighter planes had enclosed cockpits with small heating systems and better wind protection than earlier open-cockpit designs.
6. Thermal Blankets:
Crews in bombers sometimes carried insulated blankets to cover their legs and bodies during missions.
Challenges Despite Improvements:
Equipment Failures: Heated suits and oxygen mask heaters were prone to malfunction, leaving crew members to endure sub-zero temperatures for hours.
Exposed Positions: Crew members operating in exposed positions, like tail gunners or ball turret gunners, suffered the most as these areas received less benefit from heating systems.
Frostbite and Hypoxia: Prolonged exposure to the cold led to frostbite, while the combined effects of cold and low oxygen could impair mental and physical performance.