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Key Features

  • More displacement, but same size and weight as .32-size engine
  • Designed for use on 25- to 36-size aircraft
  • Aftermarket high-performance muffler available for more power
  • Low-speed SetRight™ needle valve


The NX series is designed to provide a unique combination of powerful performance, reliable engineering and remarkable ease of use. The .40NX is the same size and weight as our competitor’s .32-size glow engines, but packs more of a punch. Its displacement of .40 cu in provides sport models with plenty of get-up-and-go without adding weight. And since it’s an Evolution® engine, the .40NX has the innovative low-speed SetRight™ needle valve with a lever that makes easy adjustments and takes all the guesswork out of operation.

Note: The 40NX was designed to bolt in extra horse power to most 25-32 sized aircraft. The 40NX will fly .40 size planes but with its smaller case size will not fit most .40 size engine mounts and with its light weight may require extra nose weight for proper CG balancing.

Age Recommendation: Not for children under 14 years. This is not a toy.

Benchmark Prop: APC 10 x 6 @ 14,300, APC 9 x 7 @ 15,600, APC 10 x 6 @ 14,300, APC 9 x 7 @ 15,600
Bore: 0.845 in (21.69mm), 0.845 in (21.69mm)
Carb Type: Barrel, Barrel
Crankshaft Threads: 1/4-28
Cylinder Type: ABC
Cylinders: Single
Displacement: 0.41 cu. in. (6.74 cc), 0.41 cu. in. (6.74 cc)
Fuel: 5 - 30% Nitro, 18% Synthetic or Synthetic/Castor mix oil
Muffler Type: Expansion Chamber
Muffler Weight: 2.5 oz (71 g)
Prop Range: 9 x 5 - 11 x 6
RPM Range: 2,800 - 18,500
Stroke: 0.717 in (18.21mm), 0.717 in (18.21mm)
Total Weight: 12.5 oz (356 g), 12.5 oz (356 g)

Parts Listing

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Optional Accessories

 $27.99 $34.99
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 $13.29 $13.99
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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