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Each little change in the texture of the surface will have its effect on a vessel as light as this one, slowing the speed, calling on a bit more fuel, slowing RPM, then releasing all three to go back to a more normal state. These days, instruments are so well-tuned, every minute change is seen and must be averaged.
This makes sure there are no spike readings up or down, and it is done for RPM, speed, and fuel flow. We used our Garmin display to hone in on each individually targeted RPM, matched with speed through the water and fuel consumption. Here we see a sample of the computer recording of the tests we conducted.
Along the bottom of the graph, we see time. The red line is RPM, the light blue line is speed through the water, and the green line records fuel consumption. In order to get as accurate and repeatable results, the test boat was operated at each RPM setting for relatively long periods of time.
Our test team waited for the boat to settle down, then turned on the recording device for a period of 30 seconds or so, to record data. The dark blue vertical hat-sections indicate where data was recorded. Then, when we visually saw our gauges, what appeared to be average readings, we turned on the recording device, captured the red RPM data, blue speed numbers, and the green fuel flow numbers. The data captures can be seen in the graph above.
At some RPM settings, there were two data captures, and that was because we felt that the first one might be flawed, and so a second one was made to ensure accuracy. After the test, the computer averaged the readings in each period to ensure that the highs and lows were taken out, so a repeatable number could be ascertained.
For those unfamiliar with propeller geometry, the diameter is the distance from the blade tip across the hub to the opposite blade tip or its perimeter. The pitch is the theoretical distance that the propeller blade would travel in one revolution through a solid without slippage � imagine it turning through a solid block of wood. Our two-person test crew was nearly identical in weight. In any boat, weight is one of the most critical aspects when testing.
BoatTEST was careful to top off the fuel tank after every propeller was tested and all other weight aboard the boat was kept the same, propeller to propeller.
We were particularly careful to keep the weight in the boats the same, even to the point of using test captains of near-identical weight. A fuel dock was close to our testing areas. The Detroit River connects Lake St. Clair to Lake Erie. Here, the water is protected and deep enough for proper testing. Testing commenced at an idle speed of rpms and increased through 13 different rpm settings to Wide Open Throttle.
See the charts below for full data for each propeller. The first propeller we tested was a popular size made by a well-known brand that has been a household name in the marine industry for many years.
We inspected it visually for dings and flaws. Sharrow Engineering had already tested the propeller for proper balance. It is an industry favorite and has been used for years on thousands of boats both as original equipment and in the aftermarket. This difference in geometry put it to some disadvantage, but as we will see, it also had its attributes.
At rpms with Aluminum Boat Builders Pacific Northwest Lyrics propeller 1, we were moving at 4. Our test numbers for propeller 1 were recorded and double-checked then rigorously run twice more for confirmation. After testing each propeller, we ran the same routine of heading back to the marina, fueling up, and changing to the next propeller.
After carefully inspecting the second propeller, it was installed on our test engine. The second propeller we tested was also a premium industry Aluminum Boat Builders Bc Indonesia 3-bladed propeller and one known for its fuel efficiency at cruising speeds. This propeller performed nearly identically to propeller number one, except it got on plane at rpm, and at rpm, went This is the major advantage of this propeller vis a vis the first propeller tested � it can get on plane at lower rpm.
Note that fuel consumption for the two props is almost identical except at rpm. 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 Aluminum Boats Builders Kit now had virtually no detectible vibration.
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.
Backing the boat into a slip was also much easier than with a conventional 3-blade propeller because of the added hold on the water and reduced slip. Range increased by At RPM, we were going This clearly outperformed both of the conventional three-bladed stainless-steel props.
Search Advanced Search. Personal Watercraft for Sale View All. Grady-White's Freedom Liked it? Share it! Facebook Twitter. Boat Reviews. Related Boats for Sale. Stingray SE Request Price. Stingray LR Request Price. Stingray SC Request Price. Axis T22 Request Price. Axis A22 Request Price. Boating Guides. High freeboard adds to the safety factor and toe-rails are at deck level. This extends three-quarters of the way across the deck, so as to leave space for a walkthrough to starboard that leads through a fiberglass door to the swim platform.
Just behind and centered is an optional retractable ski-tow pylon. The gallon Battery switches are right inside the cockpit entrance. Notice the shore power plug. Ahead and to starboard is an aft-facing seat. To the opposite side of the walkthrough, the electromechanical adjustable aft-facing seat is repeated, or it can be swapped out for an optional wetbar that includes storage beneath a sink. A sliding section of the Corian counter closes off the sink when not in use. The under-sink storage can also accommodate an optional refrigerated drawer.
In either case, a storage drawer and pull-out trash receptacle are just ahead. The cockpit is well suited for socializing with the transom bench seat and aft facing seat just ahead.
Go with the standard extendable port side seat, or opt for this wet bar with a sink. An optional refrigerator can be added in lieu of the three drawers. Above is the upgraded hardtop offering protection from the elements.
Four rocket-launcher-style rod holders are along the trailing edge. These will be removed if the electrically-retractable SureShade is Aluminum Boat Builders Oregon Live chosen to bring the shaded area further aft into the cockpit.
LED spreader lights are fitted fore and aft. Speakers are strategically placed for optimum sound. Reinforced receivers can accommodate optional outriggers. The hardtop also includes zippered life jacket storage. As an added option, consider matching a hull color to the underside of the hardtop. Having a standard hardtop is a huge feature on this boat. Other builders would make it an option, which everyone would surely get.
An extendable SureShade brings the shade over the entire cockpit. Optional outriggers can be added as the hardtop is already reinforced to accommodate them. A grab handle is forward alongside the door to the head. Teak trims the side storage compartment and makes up the decking.
Rod holders are fitted and extend under the forward bench seat. The toilet is electric-flush. A sink is under-mounted to the Corian counter. A teak trimmed shelf is just beneath. Of course, the perimeter of the entry is gasketed to eliminate any vibration when the is underway. The head is well-fitted and includes an electric flush toilet and teak highlights. Rod storage extends forward under the port bow seating. Even the inside of the head door get a fair amount of attention.
The helm is mounted to starboard and, as Grady-White chooses not to be in the electronics business, the panel is open and ready to accommodate any brand an owner desires.
Being redesigned for this model year, the panel will now accommodate larger flush mounted displays. The compass is center-mounted to the top of the panel.
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