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Tailgating
Speeding.
Careless handling
Speeding.
One Word answer: Yes
Accidents.
Many small aircraft have 1 propeller.
There are many causes of bus accidents. One of the major causes of bus accidents, as with any auto accident, is the failure of a driver to see another driver on the road.
By far the main cause of campsite accidents are down to one cause: People Think of any common campsite accident, set in an empty campsite, chances are they simply couldn't happen: No one starting the campfire that gets out of control. No one putting in tent pegs, that becomes a trip hazard. No crazy accidents involving an overly long hunting knife used to gut a fish. The list goes on, but its fairly obvious that people cause accidents
Accidents. There is no specific one, but all accidents are clumped into this. It's sports, motor vehicles, drug overdose, alcohol related, ect.
A uni-rotating propeller is one that can go around in both directions. This type of propeller typically will do different things depending on which direction it is going.
In my area the cause is usually the garbage guys going on strike for one reason or another.