O.S. Engines, .91 FX RINGED W/MUFFLER

Hobbies R Us

OSMG0591   O.S.   .91 FX Ringed w/Muffler

TECH NOTES
 This is one of the O.S. FX Series of High-Performance Engines. This series of
  engines are Used in Sport and Aerobatic Aircraft. The FXs are Designed to
  Use a Muffler or Tuned Pipe. This is an ABN Ringed Engine.

FEATURES: One-piece crankcase
          Twin ball bearing-supported crankshaft
          Schnuerle porting (AKA Schnuerle scavenging)
          ABN construction (Aluminum piston, Nickel plated Brass cylinder) with
            a steel ring.
          Advanced Bi-Metallic Liner. This process uses a double layer of
            plating material, rather than one thicker layer. This helps the
            metal to bond to the cylinder, and is more durable. Also, the
            plating process is more consistent, resulting in a more precise
            fit between piston and sleeve. The end result is better compression
            and longer life.
          Side exhaust with muffler with rotatable exhaust outlet
          Carburetor with remote needle mounted on the backplate of the
            engine (to keep fingers away from the spinning propeller).
          Two-year warranty

INCLUDES: One Expansion style muffler (#E-4010) with screws
          One Assembled engine with carb.
          One package illustrated instructions, parts list, and O.S. decal
          One O.S. #8 glow plug (OSMG2691)

SPECS:    Displacement:      14.95cc (0.912 cu in)
          RPM range:         2,000 - 16,000
          Bore:              27.7mm (1.090")
          Stroke:            24.8mm (0.976")
          Compression Ratio: 10.1 : 1
          Weight: 550g (19.42oz)   24.3 oz w/muffler
          Horsepower:        2.8 BHP at 15,000 RPM
          Length: 96mm the distance from the backplate to drive washer
          Width: 42.6mm width of engine neglecting engine mounting flanges
                 52.0mm distance between centers of the mounting holes
          Height: 103mm
          Crankshaft Thread Size: 5/16" - 24
          Props: Hobby Services recommends a 13x8 or 13x9 prop (6/99)
          NOTE: Exh port same size as .61SF so can use 61SF Header w/91 Pipe

REQUIRES: Fuel: 18% (minimum) conventional lubricant content and 5%-20% Nitro.

COMMENTS: All FX series engines are covered by the OS two year warranty
          Engine mounting & exhaust dimensions are the same as .61FX.
          Engine guru Clarence Lee tached this engine w/various props
           Prop Size              RPM
              13x6              12,500
              13x8              10,400               using a 13x8 prop,
              13x10              9,500               Hobby Services tached this
              14x6              10,900               engine at 11,300 rpm
              14x8               9,500                                  6-24-99
              14x10              8,400
              15x6              10,200
              15x8               8,100
              16x6               8,300
   
ACCESSORIES
                   THIS IS A 2-STROKE R/C AIRPLANE ENGINE.
THE ENGINE INCLUDES A MUFFLER, GLOW PLUG, NEEDLE VALVE EXTENSION AND MUFFLER
  MOUNTING BOLTS.
THE STARTING EQUIPMENT FOR THIS ENGINE IS INCLUDED IN THE ACCESSORY COMPLETION
  GUIDE FOR THE KIT.