The cause of the imbalance was found to be the failure of an aluminum part mounted between the blades that has an aerodynamic function.
Air ventilation works through fins on the aluminum part of the shelters.
Manufacturers can make their trucks much heavier and roomier while using fewer expensive but weight-saving aluminum parts.
It has a few aluminum parts, and weighs a few ounces less than the 550.
The car show in Molsheim showed the car in blue carbon fibre and aluminum parts.
The bicycle's weight is less than 11 kg, and it has many lightweight aluminum parts.
They weigh 20 percent to 25 percent less than aluminum parts of the same shape.
When World War II broke out, they converted that process to build aluminum parts for fighter planes.
When the manufacturers began using alternative materials - like fiberglass bodies, carbon fiber, aluminum parts - it became that much easier.
For example, they produced refrigerator door handles and cast aluminum parts for the automobile industry.