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

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

The 3W-70i B2 CS is a premium 68cc twin-cylinder gasoline engine designed for high-performance RC aircraft, towing aircraft, 3D flight models, large sport aircraft, scale aircraft and professional aeromodelling projects. As part of the 3W Competition Series, the CS version is engineered for improved performance, faster response behavior and higher torque compared with standard configurations.

KEY FEATURES & BENEFITS:

• Competition-Series Twin-Cylinder Engine:
• • 68.00cc gasoline engine displacement
• • Twin-cylinder architecture for smoother operation
• • 7.0HP / 5.14kW output reference
• • 1,200–8,500 RPM operating range reference
• • Ideal for towing aircraft, 3D flight models and flight models up to approximately 10kg
• • CS version tuned for stronger response and high torque

• Professional RC Aircraft Performance:
• • 38mm bore and 30mm stroke specification
• • 1.95kg weight including ignition
• • 3-ball-bearing crankshaft support
• • 1:50 gasoline/oil mix reference
• • 6.0–8.4V DC ignition input
• • Transfer ports in cylinder and crankcase modified for competition performance

• Aeromodelling Integration:
• • Suitable for advanced RC pilots, flying clubs, aeromodelling workshops and professional model-aircraft builders
• • Supports large model aircraft where smooth mid-range running is important
• • Recommended for demanding setups requiring reliability, throttle response and high torque
• • Installation and tuning should be handled by experienced operators

APPLICATIONS: RC towing aircraft, 3D flight model aircraft, large-scale RC airplane builds, sport RC aircraft, scale model aircraft, petrol-powered model aviation, RC aircraft engine replacement, professional aeromodelling workshops, engineering college aircraft labs, fixed-wing UAV prototype power-system testing, RC flying club maintenance, high-performance model-aircraft power-system integration.

FREQUENTLY ASKED QUESTIONS:

Q: What is the 3W-70i B2 CS? 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.

Q: What is the price of the 3W-70i B2 CS? A: The listed import price is 2,45,000 ₹ 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.

Q: What does CS mean in 3W-70i B2 CS? A: CS refers to the Competition Series version, which is designed for improved performance, faster response behavior and higher torque compared with standard configurations.

• Q: What is the displacement of the 3W-70i B2 CS?
• A: The official displacement is 68.00cc.

• Q: What power output does it produce?
• A: The engine is officially listed with 7.0HP / 5.14kW output.

• Q: What is the RPM range?
• 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.

• Q: What is the bore and stroke?
• A: The listed bore diameter is 38.00mm and the listed stroke is 30.00mm.

• Q: What is the engine weight?
• A: The listed weight is 1.950kg including ignition.

• Q: What crankshaft support does it use?
• A: The engine uses a 3-ball-bearing crankshaft.

• Q: What connecting rod bearing design is referenced?
• A: Technical annex references needle bearings at both ends of the rods.

Q: What fuel/oil mix does it use? 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.

• Q: What ignition voltage does it require?
• A: The official ignition voltage range is 6.0–8.4V DC.

Q: What battery options can be used for ignition? 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.

Q: What propellers are recommended? 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.

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

Q: What aircraft is the 3W-70i B2 CS suitable for? 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.

Q: What makes this engine good for towing? 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.

Q: What makes this engine good for 3D flight? 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.

Q: Is the 3W-70i B2 CS suitable for beginners? 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.

Q: Can it be used in UAV prototype projects? 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.

Q: What else is required for installation? 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.

Q: What maintenance is required? 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.

Q: What safety precautions are important? 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.

Q: Why choose a 3W Competition Series engine? 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.

Q: What warranty is included? 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.