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ContinuousWave: Whaler Performance
4 blade prop on E-88
|Author||Topic: 4 blade prop on E-88|
posted 07-29-2002 12:42 PM ET (US)
I'm in the market for a spare propellor for my 93 Evinrude 88SPL, and am wondering if anyone has tried any of the 4 blade props out there? What are the pro's and cons of 4 vs 3 blades?
posted 07-29-2002 02:01 PM ET (US)
Tried a 4 blade composite on mine and HATED it. But again that was a composite, stay away from them. I do not think you will get any benefit from a 4 blade on a light boat unless you are running it high on a jackplate. The 4's grip better but have more drag so you get a better holeshot but less top end. Montauks have good holeshots to begin with.
posted 07-31-2002 10:27 AM ET (US)
In the mid-1930's the great French liner NORMANDIE was launched and put into service on the North Atlantic run, where she soon established herself as the fastest, most luxurious ship afloat. On her maiden runs she set new records for crossing times, being the first ship to average greater than 30-knots for the whole trip, but the passengers, particularly those in the stern of the ship, complained of vibration.
After the first season, the NORMANDIE was laid up and refitted. Additional bracing was welded into the stern of the ship and her propellers were changed from 3-blade to 4-blade. This had a very significant effect in reducing vibration.
Now you can draw a parallel from the NORMANDIE to your boat. She had four propellers and a shaft horsepower of around 160,000 HP. She was 1,029 feet long and displaced 82,799 tons. The propellers were 16-feet in diameter and weighed 23 tons each.
The naval architects decided that in order to couple an average of 40,000 HP per propeller it might be smoother if there were four blades instead of three.
You may experience this same benefit with your 88-HP outboard.
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