About

Never Ending Progressive
King Dolphin Propeller

3 BLADES propeller

WHY 3 BLADES?

We can recommend 3 blasdes for recreational boats with 3,4 and 6 cylinder outboards, which of propellers provide better hole shot and top – speed enforcement.

Blade Vibration Total efficiency
2 Worst Good
3 Less decreased Better
4 Decreased Best
  • Efficiency : Superior grip on the water Improved acceleration, Maximum thrust
  • 3 blade propellers provide the best balance between smoothness and efficiency

WHY CHOSEN MATERIAL OF ALUMINUM

Easy to repair under normal conditions, it can last for many years (Durablility).
Comparing price, better performance.

Product Detail

CONCERING TO DIAMETER, PITCH, RAKE AND SO ON

DIAMETER

It is 2 times of the distance from center of the hub to the tip of blade to determine the amount of power

  • Heavy loaded boat require larger diameter
  • Small, fast boat is more efficient with a small one

PITCH

It is combined by actual distance, plus slip distance with each revolution.
The actual distance is less than pitch size because of slip which need to provide thrust

Pitched Propeller Forwarding Distance RPM Effective
Lower Less Increase Easy to speed up But top speed is lower Faster acceleration
Higher More Low Low speed, more top speed
  • Adding 1 pitch will reduce RPM by 150-200 RPM.
  • Subtrachting 1 inch of pitch will increase RPM by 150-200 RPM.

RAKE

It is angle measured from center of the hub through the center of the blade.
Rake can be flat and progressive

Rake Effective
High
  • Lift the bow of the boat
  • increase speed
Low
  • Hold the bow of the boat down
  • Application : workboat

VENTILATION

It is caused by air bubbles from surface air or exhaust gasses being down into blade

  • Loss thrust
  • RPM climb widly
  • Lose speed ( prevention)

CUP

Cupping acts like a seal on the edge of the blade.
It keeps water on the high pressure blade face to reduce ventilation
and slipping. Cup is helpful for sharp turns, applicable engine is mounted.

Propeller List by Engine Brands