This is the RL-53H Ringed Redline Series Two Stroke Helicopter Engine
                              from Thunder Tiger.

FEATURES: CNC construction low profile cylinder head, anodized red in color
          Fixed type two-needle carburetor with two mounting bolts, push/pull
            throttle lever and heat insulator for consistent performance under
            different flying conditions and cowl enclosures
          Lightened hypereutectic machined Al-Si ringed type piston
          XC2 (extreme composite) cylinder liner coating with a criss-cross
            pattern etched on the sleeve wall
          Knife-edged high-strength connecting rod with bushings
          Redline R3 glowplug with platinum alloy filament
          Reinforced resin rear cage ball bearing support
          Three year limited warranty through Hobby Services beginning at date
            of purchase

INCLUDES: RL-53H Helicopter Engine with Redline R3 Glowplug, 2.5 & 3mm hex
            wrenches, two head shims, box wrench and instruction manual

REQUIRES: Fuel: Heli blend with 10-30% nitromethane and 20% lubricant content
          Glow starter, plug wrench and field equipment

SPECS:    Displacement: 0.529 cu in (8.27 cc)
          Bore: 0.886" (22.5mm)
          Stroke: 0.858" (21.8mm)
          Practical RPM: 2,000 - 21,000
          Output: 2.1 BHP/17,000 RPM
          Weight: 13.40oz (380g)
            Carburetor Settings;
          Needle Valve: Three turns from closed position
          Mixture Metering Screw: 1/12 - 1/8 turn counter-clockwise

          Distance/top of cylinder head-bottom of mounting tabs: 3.1" (80mm)
          Distance/top of cylinder head-bottom of crankcase: 3.5" (88.5mm)
          Distance between mounting holes same side: 0.71" (18mm)
          Distance between mounting holes opposite side: 1.7" (44mm)
          Cylinder head width: 1.7" (44mm)
          Width at mounting tabs: 2.05" (52mm)
          Width of crankcase below mounting tabs: 1.38" (35mm)
          Center of engine to front bearing: 2.04" (51.7mm)
          Backplate to front bearing: 3" (76.2mm)
          Crankshaft size: 1/4-28 UNF

                                                                   jxs 10/18/10
                                                                         ir/jxs