HIRTH 2703's have the highest operational time of any Hirth engine. The 2703 produces more horsepower than any other engine in its power class and is the forerunner in power plants for light ultralight trainers, single seat gyrocopters, and experimentals today. 2703 incorporates Al-Nikasil coated cylinders for superior performance and reliability. Al-Nikasil in simple terms is a nickel based material, applied in a paste form, when super heated it becomes part of the cylinder itself. Al-Nikasil provides for a super low coefficient of friction, reducing engine heat and wear. The pistons and cylinders expand at the same rate thus providing for a seizure resistant engine. 2703 crankshaft is 4130 chromemolly steel. Heads, cylinders, rings, block casting, connecting rods and associated components
Factory recommended TBO is rated at 1000 Hrs. @ 75% power.
Dual 38mm slide
2 cycle, two cylinder
Aux. external pneumatic
Fuel mixed with oil @ 50:1
Counter clockwise, viewed from output end
12 volt electric, optional recoil
250 watt/20 amp alternator standard
Optional fan or free air cooled by prop
55hp @ 6200rpm
75 lbs.-free air, 81 lbs-fan-cooled including electric start and exhaust.
Optional gearbox adds 19 pounds.
49ft/lbs @ 5600rpm
G-50 gearbox available in 2.16:1, 2.29:1, 2.59:1, 3.16:1, and 3.65:1 ratios.
Various belt drives also available.
(Capacitive digital Ign.)
Elastomeric dampener or optional centrifugal