Just spotted this:
http://www.unmannedsystemstechnology.com/2017/05/3w-international-announces-new-hybrid-engine-uavs/
Murry Rozansky.
“We wanted a high-quality, fuel consumption-optimized engine which would
demonstrate an outstanding power-to-weight ratio”, continued 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). This results in a power-to-weight ratio of 5.66
hp/kg, [5.66 HP/2.2 pounds or 2.6 HP per pound.] with a fuel
consumption of 340g/KW at full load."
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The Le Mans Mazda 4 rotor was 286g/KW. Much better . The TTC engine is
3.25 HP per pound with out
the gear box.
Paul Lamar
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"The engine can be fitted with an electric motor (starter generator),
increasing the total weight to 9.5 kg. 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."
"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."
"The 3W-180 SRE Hybrid is equipped with two independent cooling systems.
A water cooling circuit undertakes the cooling of the engine housing,
while 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."
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Are you listening? you charge cooled or air cooled rotor Europeans. :-)
Paul Lamar
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