The frame, structures and 3D design
1.[2p] Frame stiffness matters more than raw strength largely because
Frame stiffness matters more than raw strength largely because
The answer is: a floppy frame rings at low frequencies and feeds false vibration into the gyroscope
The answer is: a floppy frame rings at low frequencies and feeds false vibration into the gyroscope
The answer is: a floppy frame rings at low frequencies and feeds false vibration into the gyroscope
2.[2p] Carbon fibre plate is used as flat panels loaded in their plane because
Carbon fibre plate is used as flat panels loaded in their plane because
The answer is: the fibres are stiff along their length, so the sheet is far stiffer in-plane than through its thickness
The answer is: the fibres are stiff along their length, so the sheet is far stiffer in-plane than through its thickness
The answer is: the fibres are stiff along their length, so the sheet is far stiffer in-plane than through its thickness
3.[3p] A cantilever arm's tip deflection under a fixed force grows as the cube of its length. If an arm is lengthened from 60 mm to 75 mm with the same section, by what factor does it flex more? Give two decimal places.
A cantilever arm's tip deflection under a fixed force grows as the cube of its length. If an arm is lengthened from 60 mm to 75 mm with the same section, by what factor does it flex more? Give two decimal places.
4.[2p] The centre of gravity should sit at the centre of the four motors because
The centre of gravity should sit at the centre of the four motors because
The answer is: the control loop assumes thrust is balanced about the middle, and an offset wastes authority holding a lean
The answer is: the control loop assumes thrust is balanced about the middle, and an offset wastes authority holding a lean
The answer is: the control loop assumes thrust is balanced about the middle, and an offset wastes authority holding a lean
5.[2p] A 3D printed part is weakest along the bond between its layers, so it should be oriented so the loads it carries run within the layers, not across them.
A 3D printed part is weakest along the bond between its layers, so it should be oriented so the loads it carries run within the layers, not across them.
The answer is: True
6.[1p] The X arm layout is preferred over the plus layout mainly because
The X arm layout is preferred over the plus layout mainly because
The answer is: it keeps all four propellers out of a forward camera's view and shares roll and pitch evenly
The answer is: it keeps all four propellers out of a forward camera's view and shares roll and pitch evenly
The answer is: it keeps all four propellers out of a forward camera's view and shares roll and pitch evenly
7.[2p] A flexible TPU part is chosen over a rigid plastic one for a flight controller soft mount because
A flexible TPU part is chosen over a rigid plastic one for a flight controller soft mount because
The answer is: it absorbs vibration and keeps propeller shake out of the gyroscope
The answer is: it absorbs vibration and keeps propeller shake out of the gyroscope
The answer is: it absorbs vibration and keeps propeller shake out of the gyroscope