Whirlwind 330 hints

order number

• 330-3B-A/78G-78-S-R (before slash is hub model, after slash is blade model)
  • Hub
    • 330 = hub series
    • 3B = number of blades
    • A = SAE-2 1/2" flange
      B=SAE=2 7/16" flange
  • Blade
    • 78G = Blade Style
    • diameter
    • S = Standard operation (increase pressure to increase pitch, goes to flat pitch on oil pressure loss)
      C = Counter-Weight (feathers on oil pressure loss)
    • R = right hand turn (clockwise as seen from pilot)
      left hand turn

specs

• Diameter: 78"
• Weight: 55 lbs
• Governor: Pressure to Increase Pitch, meaning engine will overspeed on oil pressure loss and prop will not feather
  (they also make a counter-weighted version which feathers on oil pressure lost - but it's heavier and more expensive)
• Governor Pressure: 300-330 psi
• Max rpm: 2,700
• Mounting bolt torque: 50 ft lb
• TBO (teardown inspection): 500 hours or 5 years