Designed for aerobatic airframes capable of 550 horsepower. 150 horsepower and over 2.0 G’s more than the SD400. Allowing more realistic performance for Warbird Replicas, Racers, and Aerobatic aircraft.

Advantages


3D Model Image
Based on SD400 Design

  1. Centrifugal Clutch
    1. Engages & disengages at 800 to 900 RPM
    2. Eliminates high starter loads and burnout
    3. Eliminates propeller kick-back & damaging harmonics
    4. Makes the engine think it’s still in a car
    5. Clutch stays engaged so propeller can be used as a speed brake.
  2. Straight Cut Gears
    1. Most efficient transfer of power
    2. Eliminates fwd/aft thrust loads into drive shafts and into front and rear of case reducing weight
    3. Light weight heat treated gears for maximum strength and crown shaved for quiet operation
  3. Separate Lubrication System
    1. Allows the use of proper gear lubricants
    2. All bearings (100% roller) are pressure lubricated
    3. Eliminates extra heat load on engine oil
    4. Supports Hydraulic constant speed propellers
    5. Upgraded to a full inverted oil system
  4. Automated Engine Controls
    1. Automatic computer controlled timing and mixture to over 14,700 ft. with a stock ECU
  5. Designed for up to 550 HP
    1. Uses full size LS flywheel
    2. Pressure Plate Assy updated for smoother operation and greater lockup forces
    3. Same 7.625” vertical offset as the SD400
    4. 150 HP and 2.0G more than the SD400
    5. Same fuel and maintenance cost savings that the SD400 offers

SD550 70-71 lbs, Flywheel Assy 35 lbs.
Only 5-6 lbs more than the SD400.
Current price $41,000

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