Horizon Hobby

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Overview

Get .50 size power into your .40 size aircraft

The 55AX is better than ever, with an improved carburetor and muffler. You get the same phenomenal power, with the convenience and safety of a rear angled needle valve on the carb and a squared off muffler for easier cowling installation. If you want .50 scale power that fits conveniently in .40 size planes, get the 55AX and get flying!
  • Comes with the E3071 muffler for quiet efficiency.
  • 40K carburetor has a diagonally placed needle valve so you don’t need a remote needle valve.
  • Mounts directly into the bolt pattern for the 46AX.
  • Advanced Bimetallic Liner (ABL) uses two alloys to provide a durable layer between the brass liner and piston.
  • Recommended prop sizes: 12×7, 12×8, 13×6, 13×7.
Muffler
The large-chambered muffler reduces sound without reducing power.
Carburetor
The 40K carburetor includes a diagonally placed needle valve so there’s no need for a remote needle valve.
  • Same mounting dimensions as the O.S. Max .46 AXII
  • Advanced Bi-Metallic Liner process uses a double layer of plating material rather than one thick layer.
  • Platingprocess is more consistent, resulting in a more precise fit betweenpiston and sleeve for better compression and longer life.
  • Angular head design offers increased surface area for better cooling.
  • 40K Carburetor with diagonally placed needle valve eliminating remotneedle valve placement
  • Two year limited warranty beginning at date ofpurchase

Specs

Product Specs

Bore
0.91″ (23mm)
Crankshaft Threads
1/4-28
Crankshaft Type
Threaded
Cylinders
Single
Displacement
0.545 cu in (8.93cc)
Engine (Only) Weight
0.89lbs (404g)
Muffler Type
2-piece aluminum
Muffler Weight
4.23 oz (120 g)
Oil Type & Content
At least 16% synthetic lubricant
Plug Type
O.S. #8
Power Type
Glow
Product Height
3.6″ (91.1mm) crankcase botton to top of cylinder head
Product Length
3.4″ (85.5mm) from back plate to front of drive hub
Product Width
2.4″ (61mm) at mounting tabs
Prop Range
11×6 – 13×6
RPM Range
2,000 – 17,000
Stroke
0.85″ (21.5mm)
Weight 5 kg