In 2016, 3W-International saw an increase in the interest of heavy-fuel (HF) and gasoline combustion engines, especially so for their use in unmanned helicopters.
3W motors have been known for their use in vertical take-off aircraft since before the T-Hawk MAV unit from Honeywell. "Traditional helicopter manufacturers have always counted among our customers. But in 2016, we received many enquiries for their application in helicopters especially from China and South East Asia," confirms Karsten Schudt, managing director at 3W-International.
"There are many reasons for this. Vertical take-off and landing at arbitrary locations is extremely interesting precisely in countries where most airports and airfields are military or at least state-owned, because private people are often restricted or even prohibited from using such facilities," Schudt continues.
The helicopters’ deployment areas are added to this. "Many enquiries came from agricultural areas. Here the helicopters generally come into use for sowing seed or for pest control. However, vertical take-off aircraft are also used for observing fish stocks or for recording forest stands," says Schudt. Vertical take-off and landing enables the helicopters to be deployed more quickly and in direct vicinity of the usage site.
Schudt is easily able to understand the manufacturers’ considerations here: "Electrically driven systems are often still used for these tasks. However as soon as a greater payload has to be transported or longer deployment times are needed, the manufacturers’ considerations begin to shift to the combustion engine." Added to this is the fact that, precisely in agricultural regions, transporting fuel is often easier than charging batteries.
Consequently, many manufacturers slowly come around and build on engines made in Germany. With more than 120 standard engines and a multitude of options, 3W-International offers the right engine for every application area. "We have customers who offer their customers both the gasoline and the HF engine in one and the same model matched to the application area," explains Schudt. All engines can be used for both fixed-wing aircraft, as well as for helicopters and VTOLs.
The helicopter versions in use are very diverse. "We have requests for the traditional helicopter design up to Flettner double-rotor systems and traditional hexacopters and octocopters," continues Schudt. In addition to agricultural applications, 3W-International’s customers also deploy combustion engines in other areas in which the helicopter clearly plays off against its advantages. Therefore 3W-driven helicopters will be used in the oil and mining industry in future.
The delivery of urgent consignments such as first-aid kits or medical products is involved here. The intent is to deploy the helicopters via autopilot especially in remote regions of South East Asia. But security applications also lie within the helicopters’ scope of application, whether for traffic monitoring, border control, or in the army, air force, and naval areas. HF engines are deployed in unmanned helicopters, particularly in the latter.
"I take it for granted that vertical take-off and landing is assuming importance in unmanned flight. VTOLs combine these capabilities with the speed and flight stability of fixed-wing aircraft. That is why we are counting on demand for our engines for vertical take-off and landing to increase further going forward. VTOLs will certainly play a leading role here," says Schudt.