SE-56 has the best power to weight ratio of its class. That is something you want to have available when pulling out of that extreme 3D maneuver, or competing at an IMAC event... And you certainly don’t want to compromise reliability and performance for price!A smooth transition, great throttle response, extreme power and reliability are the main characteristics of the SE-56 power horse, and at a value that can’t be compared. 2 year warranty provided by SE engines in Florida!Specifications:Displacement: 56 cc (3.417 cu in)Bore: 1.77 in (45 mm)Stroke: 1.38 in (35 mm)Weight: 3.34 lb (1.516 kg) Engine: 2.86 lb (1300 g) Muffler: 0.25 lb (112 g) Ignition: 0.23 lb (104 g)RPM Range: 1,300-8,500Output: 5.6 hp @ 7,500 rpm Pulling Force: 13.8 Kg @ 100 m altitude (30.42 lb @ 328.08’ altitude) Pulling Force: 12.0 Kg @ 1800 m altitude (26.46 lb @ 5905.5’ altitude)Includes: Muffler, full auto advance electronic ignition, spark plug, gasket, bolts, machined aluminum standoffs, operation manual and mounting templateSuggested Propellers: 22x8, 22x10, 23x8 & 23x10Suggested Break-in Prop: 22x8Requires: unleaded gasoline, oil, ignition battery & propellerTechnical Data: Manifold: 4-petal, V-type, reed-valveIgnition Battery: 4.8-6.0V NiCd or NiMH, 6.6V LiFe or 7.4V LiPo pack (LiPo use requires voltage regulator.)Compression Ratio: 7.8:1Gas/Oil Mix: 30:1 for Break-In, 40:1 after Break-In Muffler Volume: 56.00 cc (3.417 cu in)Replacement Spark Plug: SE 32/56/112, CM6 or equivalentWeight Breakdown: Engine: 2.86 lb (1300 g), Muffler: 0.25 lb (112 g), Ignition: 0.23 lb (104 g) Please refer to the Operation Manual for proper Break-In procedures and operation.INCLUDES NGK CM-6 SPARK PLUG, RC EXL IGNITION, AND MUFFLER! Check out my other items!Be sure to add me to your favorites list!PLEASE CHECK MY OTHER ITEMS FOR MORE GREAT RC ENGINES, GIANT SCALE ACCESSORIES, AND RC SUPPLIES. FOR MORE INFO PLEASE VISIT TAILDRAGGERRC.COM . GOD BLESS!!