The second engine in the latest O.S. GT series of petrol engines is designed for the new class of models that are emerging onto the market that are specifically targeted at this size and type of engine. Many of these models are sleek in design, so O.S. has chosen a rear mounted Walbro carburettor with reed valve induction.

The advantage of spark ignition petrol engines over regular glow engines is the optimised ignition timing across the rev range that will not change as load goes on and off.

Like its bigger brother, the GT-55, the GT-33 is a purpose designed model engine and is not based on an industrial unit and just modified. The GT-33 has been optimised in both internal and external shape to provide class leading power and torque in a compact, light package.

Supplied with a E-5030 'Pitts' style silencer as standard, you can be confident that the final installation will be both convenient and unobtrusive yet deliver effective silencing with minimal power loss.

FEATURES:
Electronic ignition accepts LiFe, LiPo (LiPo use requires voltage regulator), NiCd and NiMH power and also offers low voltage warning.
Rear mounted Walbro carburetor-NOTE the choke valve rod shown on page 12 of the manual is not included.
Pitts style E-5030 aluminum muffler black in color, 5dB lower in noise than the competition.

INCLUDES:
GT33 Gasoline Aircraft Engine with Muffler, Carburetor, CM-6 Spark Plug and Instruction Manual

REQUIRES:
2-cycle oil, see SPECS
Ignition Battery: 4.8-6.0V NiCd or NiMH, 6.6V LiFe or 7.4V LiPo pack LiPo battery requires voltage regulator
Propeller: 18x10-12, 19x10, 20x8-10, use 18x8 prop for break-in.
Mounting standoffs, length depends on aircraft.
Gasoline safe fuel tubing and fuel filter.

SPECS:   
Displacement: 2.013 cu in (32.98cc)
Bore: 1.417" (36mm)
Stroke: 1.276 (32.4mm)
Total Weight: 2.7lbs (1230g)
Engine, 34.72oz (984g)
Muffler, 5.65oz (160.5g)
Ignition: 3.70oz (105.0g)
RPM Range: 1,800 - 8,000
Output: 3.9 PS, 3.85 HP/9,000rpm
Gasoline/Oil Mixture: 30:1 - 50:1
25:1 fuel/oil mixture if brand of oil states 50:1 mix
Replacement Spark Plug: NGK CM-6 or Denso U20M-U
Height, Crankshaft Center to Exhaust Outlet: 6.1" (156.1mm)
Height, Crankshaft Center to Muffler Body: 4.1" (105.4mm)
Height, Crankshaft Center to Muffler Mounting Holes: 2.1" (54.4mm)
Height, Crankshaft Center to top of Cylinder Head: 4.3" (109.2mm)
Length, end of Crankshaft to Carb: 7.7" (196.6mm)
Length, end of Crankshaft to Backplate: 6.2" (158.9mm)
Length, end of Crankshaft to Center of Engine: 4.9" (125mm)
Length, Prop Washer to Center of Engine: 3.3" (84.5mm)
Length, Prop Washer to Carburetor: 6.1" (156.2mm)
Length, Prop Washer to Backplate: 4.7" (118.5mm)
Width, Muffler Body: 4.5" (114mm)
Width, Crankshaft Center to Exhaust Outlet: 1.2" (31.5mm)
Cylinder Head Diameter, front to back: 2.5" (62.8mm)
Cylinder Head Diameter, side to side: 2.6" (66mm)
Mounting Hole Centers top to bottom: 2.1" (54mm)
Mounting Hole Centers side to side: 3" (76mm)

Download samlevejledning PDF (4,8 MB)

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With other engines you have to purchase a Pitts-style muffler separately — but the GT-33 comes with an E-5030 muffler that resists distortion, resulting in 5dB less noise than similar engines. The space-saving design reduces the need to cut the cowl in order to fit in scale applications.

Enjoy quick, confident starts with the included ignition module — which accepts batteries of all types, including LiFe and LiPo chemistries.

Mounting the Walbro carb at the rear allows for easy installation and easy needle access. The backplate mount is designed to reduce vibration, and the carb features a factory-installed choke linkage, which needs to be set up by the modeler.

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