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Product Overview

When it comes to gasoline aircraft engines, the GT-33 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 GT-33 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 gas powerhouse for the serious pilot!For the many planes that use 2-stroke .91 or 4-stroke 1.20 glow engines, the GT22 — the third gasoline engine available from O.S. — is the perfect choice. It cranks out nearly 10% more power than other 2-stroke gas engines of similar size!Throughout the GT22, the fit and finish are outstanding — always delivering the same high performance as when you first installed your brand new, hand-crafted, quality inspected O.S. Engine.


  • 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 CM-6 spark plug


  • Displacement: 2.013 cu in (32.98 cc)
  • Bore: 1.417 in (36.0 mm)
  • Stroke: 1.276 in (32.4 mm)
  • Practical rpm: 1,800-8,000
  • Output: 3.85 hp @ 9,000 rpm
  • Engine: 34.72 oz (984 g)
  • Silencer: 5.65 (160 g)
  • Igniter: 3.70 oz (105 g)
  • Includes: engine, E-5030 muffler, ignition module, CM-6 spark plug, exhaust gasket
  • Requires: 2-cycle oil
  • Ignition Battery: 4.8-6.0V NiCd or NiMH, 6.6V LiFe or 7.4V LiPo pack
  • Gas/Oil Mix: 30:1-50:1

Suggested Props

  • 18x10-12, 19x10, 20x8-10, 18x8
  • Suggested Break-In Prop: 18x8
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