| HKS 700E | |
|---|---|
| HKS 700E mounted on a Flightstar II | |
| Type | Twin cylinder four-stroke aircraft engine |
| National origin | Japan |
| Manufacturer | HKS |
The HKS 700E is a twin-cylinder, horizontally opposed, four stroke, carburetted aircraft engine, designed for use on ultralight aircraft, powered parachutes and ultralight trikes. The engine is manufactured by HKS, a Japanese company noted for its automotive racing engines.[1][2][3]
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The HKS 700E is equipped with dual capacitor discharge ignition, dual carburetors and an electric starter. The cylinders are nickel-ceramic coated. Cooling is free air, with oil-cooled cylinder heads. The engine has a single camshaft operating overhead valves; each cylinder has four valves. The lubrication is a dry sump system with a trochoid pump.[1][3]
The reduction drive is a choice of two integral gearboxes. The A-type gearbox has a 2.58:1 ratio and can accommodate propellers of up to 4,000 kg/cm2 inertial load. The B-type gearbox has a 3.47:1 ratio and can accommodate propellers of up to 6,000 kg/cm2.[1][3]
The 700E burns 9 L (2.4 US gal) per hour in cruise flight at 4,750 rpm. The recommended time between overhauls is 800 hours, although this is expected to be increased as experience is gained.[3]
Producing 60 hp (45 kW) at 6,200 rpm for three minutes for take-off and 56 hp (42 kW) at 5,800 rpm continuously, the 700E was designed to compete with the Rotax 582 and Rotax 912 engines.[1][3]
The company acknowledges the engine's design limitations, stating:
WARNING! This is a non-certified aircraft engine, the possibility of engine failure exists at all times. Do not operate this engine over densely populated areas. Do not operate this engine over terrain where a safe, power off landing cannot be performed. The operating and maintenance instructions supplied with this engine must be followed at all times. Flying any aircraft involves the risk of injury or death, building and maintaining your own aircraft requires great personal responsibility.[3]
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