Marine propeller
View Patent ↗A marine propeller is provided with three blades, a skew angle of approximately 33 degrees, a rake angle of approximately 28.5 degrees, and a blade area ratio (BAR) of approximately 60 degrees. The rake is preferably progressive. Each of the blades is preferably tail loaded.
1. A marine propeller, comprising:
a hub having a central axis; and
three blades attached to said hub and extending radially outward from said hub, said propeller having a blade area ratio between 55 and 65 percent, each of said blades having a skew angle between 28 and 38 degrees;
wherein the diameter of said propeller is a function of the pitch of said blades which is defined by the relationship D=(−0.23P)+X, where P is the pitch, D is the diameter and X is between 17.93 and 18.93 inches.
2. The marine propeller of claim 1 , wherein: each of said blades has a rake angle between 23.5 degrees and 33.5 degrees.
3. The marine propeller of claim 2 , wherein:
each of said blades has a rake angle between 26.5 degrees and 30.5 degrees.
4. The marine propeller of claim 2 , wherein:
each of said blades has a rake angle which is generally equal to 28.5 degrees.
5. The marine propeller of claim 1 , wherein: each of said blades is tail loaded.
6. The marine propeller of claim 1 , wherein:
X=18.4 inches.
7. The marine propeller of claim 1 , wherein:
said propeller has a blade area ratio between 58 and 62 percent.
8. The marine propeller of claim 1 , wherein:
said propeller has a blade area ratio which is generally equal to 60 percent.
9. The marine propeller of claim 1 , wherein:
each of said blades has a skew angle between 31 and 35 degrees.
10. The marine propeller of claim 1 , wherein:
each of said blades has a skew angle which is generally equal to 33 degrees.