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Hirth's most popular engine! The 3203 produces more horsepower and torque per pound than any other engine in its class. The Hirth 3203 is the forerunner in powerplants for the heaviest of ultralight trainers, gyrocopters and light experimentals today. Factory recommended TBO is rated at 1000 Hrs. @ 75% power.
3203 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. 3203 crankshaft is 4130 chromemolly steel. Heads, cylinders, rings, block casting, connecting rods and associated components are all of the highest grade alloys available.
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Model: |
3203 |
Carburation: |
Dual 34mm slide or optional electronic fuel injection |
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Engine Type: |
2 cycle, two cylinder |
Fuel Pump: |
Auxiliary external pneumatic / electric pump with fuel injection |
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Bore: |
76mm |
Lubrication: |
Fuel mixed with oil @ 50:1 or optional oil injection |
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Stroke: |
69mm |
Rotation: |
Counter clockwise, viewed from output end |
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Displacement: |
625cc |
Starter: |
12 volt electric, recoil, or both |
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Compression: |
9.5:1 |
Cooling: |
Optional fan or free air cooled by prop |
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HP Output: |
65hp @ 6300rpm |
Weight: |
73 lbs-free air, 79 lbs-fan cooled including electric start and exhaust. Optional gearbox adds 19 lbs. |
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Torque: |
55ftlbs @ 6000rpm |
Reduction Units: |
G-50 gearbox available in 2.16:l, 2.29:l, 2.59:l, 3.16:l and 3.65:l ratios Cog belt belt drive also available. |
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Ignition: |
Dual CDI |
Drive Coupling: |
Elastomeric dampener or optional centrifugal clutch. |
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Picture of 3203,s installed in Paraski twin engine PPC
Twin engine Paraski picture #2. pic#3.
Picture of 2706 installed in Sky Twister helicopter
Picture of 2706 installed in Fisher Classic Biplane
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Picture of 2706 installed in US Light Aircraft Hornet
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Picture of 2706 installed in CGS Hawk
Picture of 2706 installed in 2 place Tryke
Picture of 3203 installed on Challenger
Picture of 2706 installed in Xair pic#1. pic#2.
Picture of 2706 installed in custom dual prop KOLB MKIII pic#1. pic#2.