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Image for 15GX 15cc (.91 cu. in.) Gas Engine from HorizonHobby
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Key Features

  • Lightweight construction based on the Evolution® 91NX glow engine
  • Gasoline fuel delivers low operational cost and simplicity
  • Outstanding power and performance for demanding RC pilots
  • 2S Li-Po battery compatible ignition without a regulator provides long run times
  • Lightweight electronic ignition provides easy starts and superior reliability
  • Reliable fuel system—easy to tune and efficient
  • Standard beam mount installation makes conversion effortless
  • Each engine is supplied with accessories to make glow-to-gas conversion successful

Video Overview


Since the release of the Evolution® 10GX small-block engine, countless modelers have discovered the benefits of gas power in aircraft formerly dominated by the .40-size glow engines. But what about the pilots who enjoy even larger airplanes in the .61- to .91-size range?

Bring the fuel efficiency and easy operation of a gas engine to your sport flying experience with the Evolution 15GX engine. It’s been designed with a standard beam mount and dimensions that allow it to fit anywhere you might use a .61- to .91-size glow engine. The 15GX will breathe new life into models designed for glow power. It’s also remarkably lightweight, even with the ignition system and battery.What sets the 15GX apart from its nitro-fueled counterparts is its phenomenal fuel efficiency. You will burn 30% of the fuel you would with a comparably sized glow engine and lower your cost of flying 90%.

All of the Evolution brand gas engines are designed from the start to provide you with excellent performance at a fraction of your previous operating costs. We have painstakingly designed each engine to insure a hassle free experience without giving away anything in expected performance or durability.

Benchmark Prop: 14 x 6 @ 10,400 rpm, 14 x 6 @ 10,400 rpm
Bore: 1.09 in (27.8mm)
Carb Type: Regulated with Muffler Pressure
Crankshaft Threads: 5/16-24
Cylinder Type: Ringed/Steel liner
Cylinders: Single
Displacement: 0.91 cu. in. (15.00 cc)
Engine (Only) Weight: 21.4 oz (608 g), 21.4 oz (608 g)
Fuel: 87-91 octane gasoline (petrol)
Ignition Weight: 3.5 oz (100 g)
Muffler Threads: M4
Muffler Type: Torpedo style
Muffler Weight: 6.1 oz (175 g)
Oil Type & Content: 20:1 synthetic
Plug Type: 1/4-32
Prop Range: 13 x 7 to 15 x 6
RPM Range: 1,600-13,000 rpm
Stroke: 0.98 in (24.9mm)
Total Weight: 31.1 oz (883 g), 31.1 oz (883 g)

Parts Listing

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Optional Accessories

 $20.69 $22.99
 $45.99 $57.00
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Product Support Tips

Product Support

Evolution Engines Support Tab

Evolution Engines Product Support

Technical questions about this product should be directed to Horizon Hobby's Product Support Department:

Horizon Hobby, Inc.
ATTN: Product Support

4105 Fieldstone Road
Champaign, IL 61822

To place a Horizon Hobby Support Inquiry please visit our Inquiry Form Support Phone:(877) 504-0233
Fax:(217) 355-1552

Sales Support

If you would like to purchase this product, please go to the Store Locator or contact the Horizon Hobby Consumer Sales Department:

Horizon Hobby, Inc.
ATTN: Consumer Sales

4105 Fieldstone Road
Champaign, IL 61822
Email: Sales Phone:(800) 338-4639
Fax:(217) 355-1552