Is your engine over or under revving? Selecting the correct prop should result in your engine running within the designed rpm range at Wide Open Throttle (WOT). Your owner's manual should include this spec—usually 5000–5500rpm for an outboard or 4200-5000rpm for a sterndrive—or your mechanic or dealer may know.
Also, what Prop is best for speed?
A lower-pitch prop is like low gear in a car or a bicycle—you'll accelerate quickly but top speed will suffer. A prop with too much pitch may deliver more top speed because the prop moves further forward with each rotation, but acceleration may be poor and the boat will struggle to get on plane.
Forbye, what prop will make my boat faster? As a rule, a stainless-steel prop (assuming the correct pitch and diameter) will make your boat go faster — up to 2-3 knots on some boats. Stainless steel is stronger and can be made thinner, allowing more speed. Stainless steel also flexes less and keeps its shape at higher speeds.
Not to mention, will a 4 blade prop make my boat faster?
A 3 blade propeller usually offers top speed performance while a 4 blade propeller provides maximum thrust and smooth cruising operation. Four blades have some features of their own, though. They often provide more lift at the stern which will help accelerate the hull, especially if it is stern heavy.
What pitch prop gives more speed?
The lower the prop pitch, the better your hole-shot. However, this comes at a price: top speed. The lower pitch makes the engine reach maximum rpm at slower speeds. Conversely, a higher pitch will deliver greater top speeds, but slower acceleration.
BESTSELLER NO. 1 in 2021
FiveStar Marine Rebuild KIT!! Evinrude Johnson Trim Tilt 25 35 40 48 50 HP 1989-2004 435567 435894 435903 0435567 FSM013
BESTSELLER NO. 2 in 2021
Evinrude Etec/Johnson/OMC Cobra New OEM Prop 14 x 9 Propeller 763300,177147
14" diameter x 9" pitch
Right Hand Rotation
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Johnson Evinrude E-Tec Aluminum 3 Blade Prop Propeller 14.875â€ x 17â€ 0765187
There are a lot of variables here to consider but the stainless steel has more bit, so for the most part the rpm will be less. PJM is correct, a similar styled SS prop will drop you 100 - 200 rpms. If you look at the more aggressive SS props, your rpm's will drop even more. Definitely less rpms.
For every inch of change in prop diameter the RPM varies by about 500 RPMs (up or down) and every inch of pitch changes the RPM by approximately 150 to 200 RPM. ... The diameter of a prop decides how much water you will disturb while the pitch determines how quickly you push the water displaced out of the way.
If the RPM is below the recommended operating range, switch to a propeller with lower pitched blades. If the RPM is higher, switch to a propeller with higher pitched blades. Each inch of pitch size will change the RPM by 150-200 RPM. Aim for the midpoint or higher of the recommended operating range.
A common guideline for recommended propeller to strut or keel clearance is 20% of propeller diameter measured between the propeller blade edge and strut leg or keel. This is often measured at a point on the propeller blade edge about 70% of the distance from the shaft centerline to the blade tip.
The most asked question at the boat shows is almost always “what is the difference between a 3-blade and a 4-blade boat propeller?” The difference between a 3-blade prop vs a 4-blade prop is that the 3-blade (smaller blade ratio) is faster with a higher top speed and the 4-blade (higher blade ratio) has a better hole- ...
A good rule of thumb is smaller diameter props are typically used with smaller engines/boats, and larger diameter props are typically used with larger engines/ boats. ... Increasing prop pitch will make the boat go faster (provided the engine has enough power to keep the RPMs in the optimum operating range.
There are many factors that affect prop slip including the actual pitch of the propeller, the condition of the propeller, the design of the hull, the condition of the bottom of the craft, additional weight on the craft, distribution of weight, height the engine is mounted at, engine trim angle and setback, jack plate ...
A stainless steel prop will simply perform better and is well worth the small added expense. There are FAR more options in stainless steel props for a given outboard than in aluminum props. In the long run you will spend less on stainless steel props than aluminum props because aluminum mangles so easily.
My experiences would suggest that the High-5 props run slightly higher revs than other props of the same pitch, so be careful in your selection - especially if you are already close to the rev-limit. Other than that, you will lose a bit of top speed but gain speed and acceleration in the low to mid-range.