3W-70i B2 CS Twin-Cylinder Gasoline Engine

A: The 3W-70i B2 CS is a 68cc twin-cylinder gasoline RC aircraft engine from the 3W Competition Series, designed for towing aircraft, 3D flight models and high-performance model aircraft applications.

A: The listed import price is A$3,810 for the 3W-70i B2 CS Standard Package. Final pricing may vary if installation support, propeller matching, workshop support or UAV prototype integration assistance is added.

A: CS refers to the Competition Series version, which is designed for improved performance, faster response behavior and higher torque compared with standard configurations.

A: The official displacement is 68.00cc.

A: The engine is officially listed with 7.0HP / 5.14kW output.

A: The product listing references a 1,200–8,500 RPM operating range. Technical annex references may list 1,400–8,500 RPM depending on documentation version.

A: The listed bore diameter is 38.00mm and the listed stroke is 30.00mm.

A: The listed weight is 1.950kg including ignition.

A: The engine uses a 3-ball-bearing crankshaft.

A: Technical annex references needle bearings at both ends of the rods.

A: The official product listing references a 1:50 gasoline/oil mix. Technical annex references may include 1:50 to 1:80 depending on fuel, oil and operating guidance.

A: The official ignition voltage range is 6.0–8.4V DC.

A: A 5-cell battery pack or 2-cell LiPo reference appears in technical documentation. Battery selection should match the ignition system and safe installation requirements.

A: Technical propeller references include 24x10 wood, 26x8 wood and 20x12 CFK four-blade options. Final propeller selection should match airframe, load, altitude, flight style and safe RPM range.

A: A propeller should be treated as required separately unless specifically included in the final quotation. Confirm final package contents before order.

A: It is suitable for towing aircraft, 3D flight models, sport aircraft and scale models, especially aircraft up to approximately 10kg where engine fitment is suitable.

A: The engine is positioned for very good medium-range running characteristics, high torque and strong response behavior, which are important for towing and load-bearing RC aircraft applications.

A: The CS version is designed for greater performance, faster throttle response and higher torque, all of which support demanding 3D flight profiles when paired with the right airframe and propeller.

A: It is best suited for experienced RC pilots or beginners working under expert supervision. Twin-cylinder gasoline engines require careful installation, fuel handling, ignition setup, tuning and propeller safety.

A: Yes, it may be used in petrol-powered fixed-wing UAV prototype projects if the airframe, vibration isolation, fuel system, propeller, cooling, ignition and safety procedures are professionally engineered.

A: Typical required items include suitable propeller, fuel tank, fuel tubing, fuel filter, ignition battery, switch harness, throttle linkage, engine mount, starter equipment, field tools and correct gasoline/oil mix.

A: Maintenance should include checking propeller bolts, engine mounting bolts, muffler or exhaust hardware, spark plug, ignition wiring, fuel lines, fuel filter, throttle linkage, carburetor tuning and general engine cleanliness.

A: Operators should follow propeller safety, fuel safety, fire safety, controlled starting procedure, secure mounting, safe tuning practice and field operation rules. Never stand in front of or in line with the propeller while the engine is running.

A: 3W Competition Series engines are designed for greater performance, faster response behavior and higher torque, making them suitable for demanding RC aircraft builds where high performance matters.

A: Warranty support generally covers manufacturing defects under approved use and normal operating conditions. Damage from incorrect fuel mix, poor tuning, overheating, propeller strike, crash impact, vibration damage, dirt ingestion, water exposure or unauthorized modification may not be covered.