Sharrow pervane, Sharrow Engineering bu pervanenin 1930'lardan beri pervane teknolojisinde en önemli gelişme ve hatta devrim olduğunu iddia ediyor. Test sonuçları ivmelenme, hız ve planning performasında %15 e kadar performans artışı ve özellikle planning ve sonrası hızlarda anlamlı yakıt ekonomisi ortaya koyuyor, mevcut performans pervaneler ile kıyaslandığında.
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Üye Ol veya Giriş YapThe Sharrow Propeller™ MX-1 we tested was made by a 5-axis router out of a relatively soft billet of aluminum alloy. Its geometry was 15” x 15”. The very first thing we noticed upon firing up the engine after refueling was the absence of vibration. Three-blade props are notorious for vibration. Since the Sharrow MX-1 was really more like a 6-blade propeller, and one with no open blade tips at that, it was little wonder that the engine now had virtually no detectible vibration. While this aspect of the propeller’s performance was not measured scientifically, lack of vibration was obvious to all.
Handling. After the performance testing, Captain Steve put the boat through his normal handing maneuvers. Then, he conducted rapid, hard-over turning procedures at high speed, something we rarely try on most boats for safety reasons. Back at the dock, we asked him to characterize the boat’s handling with the Sharrow MX-1 compared to the two conventional props and he said, “A vast improvement.”
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Üye Ol veya Giriş Yap“We were able to make hard port and starboard turns at speed without the hull sliding or fear of overturning the boat, Captain Steve said. “The boat seemed ‘glued’ to the water.” That is because of the tremendous traction the Sharrow Propeller™ gets with what amounts to six blades grabbing the water.
Backing the boat into a slip, our captain reported, was also much easier than with a conventional 3-blade propeller because of the added hold on the water and reduced slip.
Sharrow Propeller™: ComparisonsSpeed. When we compared the Sharrow Propeller™ to the readings we got for the other two props, we found it was 16% faster than both at the idle RPM of 650. And, the miles per gallon difference was again 16% better for the MX-1. Range increased 14.8%.
The Sharrow MX-1 propeller doubles the speed, miles per gallon, and range of the other two props, while they are trying to get over the hump and on plane, even though the propeller pitch was only 15”, which is standard on this boat with a 150 outboard.
At 3500 RPM we see that the propeller #2 got on plane while propeller #1 was still struggling along pushing its bow wave.
At 4000 RPM, when the boat was solidly on plane with all three props, the aluminum prop was 17% to 19% faster than the conventional ss props.
Fuel Efficiency Planing. When we compare fuel efficiency for the whole RPM range, we find the at idle, the MX-1 was 16% more efficient at idle and 15% more efficient at 5500 RPM. But the biggest difference was at planing speeds where the Sharrow MX-1 was as much as 179% more fuel efficient.
Sharrow Propeller™: Testing Summary1. Performs significantly better at idle.
2. Plans at a lower RPM
3. Is faster at all RPM settings
4. Gets significantly more mpg at 3000 and 3500 RPM
5. Is more fuel efficiency at every speed-through-water setting
6. Is as much as 18% more fuel efficient at 26-28 MPH
7. Produces the highest top speed
8. Creates noticeably less vibration
9. Is generally quieter
10. Has superior handling in tight turns at high-speed
11. Improves handling in reverse
12. Provides the greatest range at all speeds
