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  Which SS prop mfg. & pitch to choose??

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Author Topic:   Which SS prop mfg. & pitch to choose??
4whaler posted 01-14-2003 06:36 PM ET (US)   Profile for 4whaler   Send Email to 4whaler  
Ok, narrowed down the cast Stainless props to a Rapture or Stilleto. Rapture is by Mich. Wheel is about $20 more. Plus the have it in 1-inch pitch changes. Running a 50 HP Evinruide 1993 2cyl. on BW GLS 15'. WOT with 1/2 tank fuel (6 gal) and me is right on redline at 5500 and shows about 30kts / loaded up with three pax and full fuel/12gal. drops to 5300 and 28kts. with 11 3/4 x 17 alum. prop. Thinking I might go for the Rapture 11 3/4 x 16 but could drop to x 15 for more ummph with load? What do ya'll think? Or Keep same prop spec of 11 3/4 x 15 but in which one Rapture or Stilleto???

reelescape1 posted 01-14-2003 09:14 PM ET (US)     Profile for reelescape1  Send Email to reelescape1     
Nice boat! I WILL have a 15' one day!! If you drop the inch in pitch, your top end will drop some, the holeshot should be better. The best way to decide is to borrow the props and try them.
Sal DiMercurio posted 01-14-2003 10:08 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
The Raptor & Stiletto are darn near identical props, they do the same thing.
Your boat will ride & run much higher on the water with either of those props, big difference from the stock aluminum.
Stay with the same size you have now, or you will over rev, unless your aluminum is worn down, & if thats the case, your new s/s will knock your top rpms way down, ...better try one before buying it.
West Marine carries Raptor & will allow you to exchange if not right.
Aftermarket is the cheapest, & Overtons is about $20 more.
Bigshot posted 01-15-2003 09:52 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
I would say the 16 or 17" not the 15".
4whaler posted 01-22-2003 12:16 PM ET (US)     Profile for 4whaler  Send Email to 4whaler     
What Michigan Wheel Says based on my submission of boat/engine tech data below their suggestion.

Outboard Form 1/14/2003
Dear Boating Enthusiast:

Thank you for your interest in Michigan Wheel. We reviewed your propeller sizing data, and based on the information submitted, you may wish to consider the following:

Diameter and Pitch: 11-3/4 x 15
Number of Blades: Three
Material: Stainless Steel
Michigan Part #: 013082
*Price: $300.99

*Suggested Retail Price.

The above suggestion should decrease your top end speed while giving you more low end power and more rpm's at WOT.

As referenced above, Rapture is one of our stainless steel performance propellers. It has aggressive blade geometry featuring a high rake and a progressive pitch designed to provide the optimum combination of dead start acceleration, bow lift and top end speed. The Rapture has been engineered with optimal blade thickness to give you excellent performance, but thick enough to increase the durability.

We thank you again for your interest in Michigan Wheel Corp. We hope this information is useful to you. This analysis is based on theory and the information provided. Please note that we cannot guarantee the exact performance of a propeller, due to the many variables involved with propeller sizing. Please feel free to check our web site for the nearest Michigan Wheel dealer/distributor that may be able to further help you. If you have any further questions or concerns please feel free to contact our customer service department at 1-800-369-4335.

Best Regards,

Michigan Wheel
Customer Service
Analysis Type: OutBoard
Analysis Reason: Spare_propeller_needed
Other Reasons: want SS primary prop
Boat Service: Passenger_Pleasure
Boat Manufacturer: Boston Whaler
Boate Year: 1991
Boat Model: GLS
Load Weight: 1000 w 1 pax and full fuel
Over All Length: 15.3
Water Line Length: 13
Boat Hull Material: Fiberglass
Engine Manufacturer: Evinruide 2 cyl
Engine Model: 40/50 Electric w/VRO tilt & trim
Engine Year: 1993
Engine Fuel: Gas
Engine Horsepower: 50
Total Engine: Single
Current Propeller: Yes
Propeller Condition: Good
Diameter: 11 3/4
Pitch: 17
Total Blades: 3
Rotation: RHR
Material: Aluminium
Shaft Size/Inches: unknown not in manual
Shaft Size/MM:
Full Throttle RPM: 5500
Full Throttle Speed: 30Knots / MPH: Knots
Intrested in HighProp: Yes
RPM Rate High: 5500 WOT
RPM Rate Low: 4500
Comments: Runs 5500/30kts with Alum. 11 3/4x 17 prop which has burred leading edges w/ 1 pax. 6 gal gas. Runs 5300/28kts with 3 pax 12 gal. gas. Want to put aluminum prop as spare and SS as primary. Rapture 11 3/4 x 17, 16, 15? or 12 1/4 x 15? Or other....
Goes good now...

Bigshot posted 01-22-2003 04:39 PM ET (US)     Profile for Bigshot  Send Email to Bigshot this for ya. Easy to find out if 17" is right and can be 'repitched" if necessary. Either way a lot cheaper than new.

tbyrne posted 01-22-2003 05:19 PM ET (US)     Profile for tbyrne    
I recommend the 15" Stiletto or the 16" Rapture - when I tested a 17" Stiletto, my max rpm were 5,600 (on a 80 hp 4-stroke with a 5,500-6,000 max). My 17" aluminum prop had spun up to 6,000 with the same load. The Stiletto has more cup than my stock Yamaha aluminum so it will not turn as high. I plan to drop to the 15" Stiletto, which should be perfect for me.
Sal DiMercurio posted 01-22-2003 09:58 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
Go to
Scroll down till you come to either Michigan [ Raptor ], or Stiletto.
If your sure about the size, these guys are the best in price, about $249 .
But you can't excange it.
Overtons allows you to exchange, but their $20.00 more.

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