Gasoline Power for Long-Endurance Fixed-Wing UAVs: The DLE120
Electric propulsion dominates the multirotor world, but for fixed-wing UAVs tasked with long-endurance patrol, wide-area mapping, and linear infrastructure inspection, gasoline engines still hold a decisive edge: energy density. A tank of gasoline carries roughly an order of magnitude more usable energy per kilogram than the best lithium pack, and that gap translates directly into the multi-hour endurance figures that electric fixed-wings simply cannot match on the same airframe weight.
When gasoline makes sense
The choice between electric and gasoline comes down to mission profile. If you need a small airframe to fly a 45-minute survey loop, electric is clean, quiet, and simple. If you need a larger airframe to stay airborne for four, six, or eight hours — monitoring a pipeline, mapping a corridor, or standing off over a search area — a gasoline engine is the practical answer. The engine does not have to be recharged, only refueled, and refueling takes minutes rather than the hours a large battery bank needs on the bench.
The DLE120: proven two-stroke power at 120 cc
The DLE120 2-stroke engine is a 120 cc twin-cylinder powerplant in a class that has become the workhorse of larger UAV and heavy fixed-wing builds. Two-stroke engines in this displacement deliver a strong power-to-weight ratio with a simple, field-serviceable design, which matters when maintenance happens on a tailgate or in a shipping container rather than in a workshop. The DLE family has a long history in the RC and UAV world, and the 120 cc twin is sized for airframes in the 20-plus-kilogram class that need real thrust for takeoff and climb, plus the reliability to run for hours at cruise.
Integration and operational notes
Running a gasoline engine on a UAV is not a bolt-on affair, and there are a few areas to plan around. Vibration is the first: a twin-cylinder two-stroke produces significant vibration that must be isolated from flight controllers and cameras with soft mounts and balanced props, or your autopilot will fight noise for the whole mission. Ignition and RF isolation are the second — keep ignition wiring away from GPS antennas and data-link feeds. And fuel management is the third: plan tank capacity around the engine’s actual consumption at cruise throttle, not its wide-open rating, and leave reserve for a go-around or an extended hold.
For integrators building the next generation of long-endurance fixed-wing UAVs, the electric-versus-gasoline decision is really a payload-and-duration decision. When the mission demands hours, not minutes, a proven engine like the DLE120 remains the most direct path to endurance that electric systems still cannot reach.