Which propulsion system is most popular and cost-effective for unmanned aircraft today?

The most popular and cost-effective propulsion system for unmanned aircraft today is the DC electric motor. This preference stems from several key factors.

Firstly, DC electric motors are lightweight and compact, making them ideal for small unmanned systems that require efficient power-to-weight ratios. Their design facilitates easy integration into various types of unmanned aerial vehicles (UAVs), particularly multirotors and fixed-wing platforms.

Secondly, electric motors benefit from low operational costs, as they typically require less maintenance than other propulsion systems like piston or jet engines. They have fewer moving parts, which reduces the likelihood of mechanical failure and minimizes maintenance downtime.

Moreover, electric motors can be powered by rechargeable batteries, leading to reduced fuel costs, and they can allow for quieter operations, which is critical for certain applications like surveillance or wildlife monitoring where noise may be a concern.

Lastly, advancements in battery technology and electric motor efficiency have continually improved performance and extended flight times, further solidifying their popularity in the unmanned aircraft sector.

In contrast, while jet engines offer high performance and speed, they are more suitable for larger UAVs and come with higher fuel costs and maintenance requirements. Piston engines tend to be heavier and more complex, not fitting as well for smaller applications. Hybrid engines