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Landing-gear weight equation

The landing-gear WERs typically used for manned
aircraft can be used within their applicable range for unmanned aircraft.

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Jet nacelle weight

Nacelles are structures that house the propulsion system. Nacelles can be
integrated into a fuselage or pod structures protruding from a wing or fuselage,
among many potential configurations

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Weight per power of the motor

Power-to-weight ratio is a measurement of actual performance of any engine or power source. It is also used as a measurement of performance of a vehicle as a whole, with the engine’s power output being divided by the weight (or mass) of the vehicle, to give a metric that is independent of the vehicle’s size.

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Horizontal tail volume coefficient

For a horizontal tail or canard, the pitching moments which must be countered are most directly related to the wing mean chord (Cw). This leads to the “horizontal tail volume coefficient,

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Mean aerodynamic chord length

If the leading edge and trailing edge are parallel, the chord of the wing is constant along the wing’s length. … The average length of the chord is known as the mean aerodynamic chord (MAC).