A number of drones these days like the one shown in the picture below have fully protected multi-rotor propeller guard system . These are lightweight, aerodynamic housing that keeps these spinning knife-blades away from people's fingers, trees etc.
So,what are the physical/aerodynamic implications of designing a prop guard for a multirotor drone whose specs are as follows:
All Up Weight with battery: 1050g
Frame weight empty (no electronics, motors, or battery): 400g
Flight time with 3s 2200mah lipo: 8 minutes
Propeller size : 10"
- Skeletal Plastic Structure
Source: Safe Flight Copters