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4.5 out of 5 Customer Rating

GT33 Gas Engine

Item No. OSMG1533
Brand Logo
4.5 out of 5 Customer Rating

GT33 Gas Engine

Item No. OSMG1533
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Product Details

In The Box
  • (1) GT33 Gasoline Aircraft Engine with Muffler
  • (1) Carburetor
  • (1) CM-6 Spark Plug
  • (1) Product manual
Needed to Complete
  • 2-cycle oil
  • 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
GT33 Gas Engine

Second in the line of O.S. gasoline engines — but second to none in quality and performance!

When it comes to gasoline aircraft engines, the GT33 is in a class of its own. It has the muscle to swing larger props, and it stands out for many other reasons, too. The GT33 runs more quietly than comparable engines while exceeding their output, and it starts easily with electronic ignition that accepts many battery types. Once again O.S. has produced a gasoline powerhouse for the serious pilot!
  • Produces 10% more power than any other engine in its class!
  • Electronic ignition system offers fast, easy starting — and accepts LiFe, LiPo, NiCd and NiMH power.
  • Rear-mounted Walbro® carb and intake simplify mounting and installation.
  • O.S. E-5030 muffler effectively controls exhaust noise without compromising performance.
  • Includes Rcexl spark plug.
Ignition Module
Enjoy quick, confident starts with the included ignition module — which accepts batteries of all types, including LiFe and LiPo chemistries.
With other engines you have to purchase a Pitts-style muffler separately — but the GT33 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.
Mounting Walbro Carb
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-supplied choke linkage, which needs to be set up by the modeler.
Crankshaft and Bearing
Crankshaft/bearings, piston liner and piston/pin and rod for the GT33.

Product Specifications

Cylinders Single
Product Width 2.4" (70mm) center of mounting holes at mounting plate
Total Weight 2.7 lbs (1230 g)
Bore 1.417" (36mm)
Crankshaft Type Threaded
Power Type Gas
Plug Type CM6
Stroke 1.276 (32.4mm)
Benchmark Prop 18 x 8 for break-in
Displacement 2.013 cu in (32.98 cc)
Oil Type & Content 2-cycle oil at 30:1 - 50:1 mix ratio
Product Length 6.1" (156.2mm) from carb to drive hub
Engine (Only) Weight 34.72 oz (984 g)
Muffler Type Pitts
Product Height 6.1" (156.1mm) from bottom of mounting tab to muffler outlet
Prop Range 18 x 10-12 - 20 x 8-10
RPM Range 2,000 - 15,000
Starter Type Hand Held Starter
Crankshaft Threads UNF-2A 5/16-24
Ignition Weight 3.70 oz (105 g)
Muffler Weight 5.65 oz (160.5 g)