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SD550 PSRU

Designed for aerobatic airframes capable of 400-550 horsepower and 6.0G’s more than the SD400. Allowing more realistic performance for Warbird Replicas, Racers, and Aerobatic aircraft.

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Specifications
SD550 PSRU
SD550 PSRU — original 3D model based on SD400 design
3D Model Image
Based on SD400 Design

400 to 550 HP

Designed for up to 550 HP

7.625”

Vertical offset

70-71 lbs

SD550
SD550 PSRU

Advantages

01

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.
02

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
03

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
Original SD550 3D model
SD550 PSRU

Designed for upto 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. 400-550 HP and 6.0G’s more than the SD400
  5. Same fuel and maintenance cost savings that the SD400 offers

Automated Engine Controls

  1. Automatic computer controlled timing and mixture to over 14,700 ft. with a stock ECU
SD550 PSRU

Specifications

SD550 70-71 lbs, Flywheel Assy 35 lbs.
Only 5-6 lbs more than the SD400.
Current price $44,000

Note: Delivery times for PSRU’s is now 130-160 days.

ORDER FORM
01

70-71 lbs

SD550
02

35 lbs

Flywheel Assy
SD550 PSRU

Enquire about
SD550 PSRU

Current price $44,000
936.827.5126
stuart@autopsrus.com