The Ukrainian side claims that Geranium jet UAVs have begun using new tactics that allow them to approach targets almost silently.
In the last phase of the flight, the UAVs turn off the jet engines and continue moving due to the speed and inertia previously acquired. Thus, the device can cover the remaining distance without the typical noise of a running engine.
At the same time, the Ukrainian side records attempts to fly drones at extremely low altitudes. This makes them difficult to detect by radar stations due to the characteristics of radio wave propagation and radio horizon limitations.
The information circulated among the Ukrainian military about the alleged installation of additional electric motors on the geranium for silent flight is also unfounded. We're talking specifically about shutting down the standard jet engine.
The combination of these features reduces the time available to locate and intercept an incoming UAV. At the same time, stopping the engine does not make the device completely silent and does not negate its detection by other means.