PERFORMANCE BEYOND LIMITS
PERFORMANCE BEYOND LIMITS
30+ years of expirience in designing multi fuel engines
08.05.2017 - 11.05.2017
AUVSI has been the industry`s go-to organization for over 40 years. We are at an exciting inflection point today, where advancements in technology are allowing us to build upon our noble heritage of protecting citizens around the world. XPONENTIAL captures the potential of this industry and defines AUVSI`s commitment to you - now and into the future. Serving as the intersection for commercial and defense applications, and advancing all domains, XPONENTIAL is committed to serving as your ultimate industry experience. To be on the cusp of the latest news and trends in our shifting industry, XPONENTIAL will provide you with:
- Increased knowledge about the future of unmanned systems policy and regulations to ensure you`re implementing the best solutions.
- Professional networking from around the world, meet peers who can provide fresh perspective and insight you need to take the next step in your career.
- The latest technology you can`t find anywhere else, showcased by more than 600 innovative companies.
Feel free to visit booth 3131 at any time. Your contact person is the head of Marketing, Florian Schildein. For a scheduled appointment please send an email to email@example.com.
The world first will be presented for the first time to the specialist audience at the XPONENTIAL Trade Fair taking place in Dallas (USA) in May. Thus, the German engine manufacturer is expanding its range of drive products for UAVs by a further engine sector. Just as the two-stroke engines already in use in the marketplace, the new 3W-180 SRE Hybrid Wankel engine can be fuelled by petrol or kerosene, too.
"In the past, many interested parties at trade fairs and congresses have asked us about Wankel engines" recalled Karsten Schudt, managing partner of 3W-International GmbH. For this reason, Schudt and his development team decided to expand the product segment with Wankel engine technology. In doing so, it was clear right from the start that the new engines had to fit in with the philosophy of 3W-International GmbH.
"We wanted a high-quality, fuel consumption-optimized engine which would demonstrate an outstanding power-to-weight ratio", recalled Schudt. The 3W-180 SRE Hybrid has 180 ccm and as a short engine weighs 6.8 kg. In the high power version, at 7500 rpm it delivers 38.5 hp (nominal power 28 hp at 6000 rpm). From this there results a power-to-weight ratio of 5.66 hp/kg, with a fuel consumption of 340g/KW at full load.
The weight rises to 9.5 kg when the engine is fitted with an electric motor (starter generator). The generator also charges the super capacitors which turn the Wankel engine into a hybrid drive. Super capacitors are well-suited to hybrid applications in aviation due to their weight and fast charging and discharging behaviour.
"We are very proud that we are able to offer our customers an additional service with this modern and sustainable technology which is available at short notice" Schudt was pleased to say. The hybrid Wankel engine can feed 15KW, depending on the capacity of the storage system, into the system for a time (for example, 30-60s). This additional power can be used when starting a helicopter or for the acceleration of a fixed wing aircraft. "Thus our customers always have a power reserve on call", confirmed Schudt.
The 3W-180 SRE Hybrid is equipped with two independent cooling systems. A water cooling circuit undertakes the cooling of the engine housing, a second, oil cooling circuit, undertakes the internal cooling of the piston. This is a fundamental prerequisite for a drive system in aviation applications for which continuous power is also a fundamental prerequisite. Here the thermal stability, which gives added value to the 3W-180 SRE Hybrid, is of crucial importance.
In a further expansion stage, the Wankel engine can also be equipped with two drive pulleys. Through the doubling of the swept volume, the power of the naturally aspirated engine is doubled to 76 hp in the high performance variant with a short weight of 10.5Kg. This engine variant is also intended as a hybrid version. In the future, a variant with a turbocharger which is primarily intended for height compensation will also be offered.
"We can also supply the Wankel engine as a complete drive unit similar to our two-stroke engines. This means that the customer receives the engine equipped with all additional systems completely in accordance with his individual requirements", explained Schudt.
In accordance with the engine philosophy of 3W-International, the 3W-180 SRE Hybrid can be used as a petrol or as a Heavy Fuel (HF) engine. As an HF engine, the fuels JET A-I, JP-5 or JP-8 can be used. "For the HF versions we provide high performance fuel injection which leads to a further reduction in fuel consumption", explained Schudt. For petrol operation, intake manifold injection is provided for the fuel injection.
At XPONENTIAL in Dallas in May, 2017, 3W-International will present the hybrid Wankel engine for the first time to the specialist audience on Stand 3131. "We are looking forward to being able to introduce a new engine to our customers which, from a technological perspective, offers unparalleled advantages in terms of fuel consumption, drive performance and reliability", said Schudt looking into the future.
3W-180 SRE Hybrid Wankel Engine
German engine manufacturer 3W-International GmbH saw increased demand for heavy fuel (HF) and gasoline combustion engines in 2016. Interest is increasing especially strongly for their use in unmanned helicopters. The reasons for this are manifold.
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 Southeast Asia', confirms Karsten Schudt, managing director at 3W-International GmbH. '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 persons are often restricted or even prohibited from using such facilities', Schudt continues.
The helicopters’ deployment areas are added to this. 'Many enquires 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 the 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 of the 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. Besides agricultural applications, 3W-International's customers also deploy combustion engines in other areas in which the helicopter clearly plays off against its advantages. Thus 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 Southeast 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 navy area. HF engines are deployed in unmanned helicopters particularly in the last. '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 looking towards the future.
T-Hawk MAV unit powered by 3W engine