I am not in position to test props before, so I would like to be as close to “very good” as possible. Any sharp turn is a challenge for our boat, particularly serious is a sharp turn to port.
There seems to be high amount of slip on the prop. I am currently trying a Fury 4 25p that is allowing me to raise the jack plate and give some transom lift but I am only turning 5500RPMs at 68.5. Just picked up a little Bayliner Vr5. So , after reading prop school from 1-6, I am thinking about :
Tempest 21 – ¾ fuel, driver and passenger, musky gear, livewells I have a 1175 Impact with a 2013 115 four stroke, it has the 2.33 gear ratio. At 3700 rpm the speed is about 26 mph (23,5 knots). The Fury 4 is faster, about 68 mph was my best, but still over my RPM range at about 6300.
In all 3 cituations the throttle went only to … Pitch is not so easy to measure. If you are mostly concerned with top end, the Fury is hard to beat. Is there any benefit to adding RPM by tweaking things such as going to lower pitch prop or raising engine further? That is a pretty large boat for a single 300, if your gear ratio is 1.75, I would consider going down to a 16 pitch Rev 4 XP. Your advice will be of great help !
The professionals at Livorsi use this algorithm to determine prop slip: For instance, let’s say a boat is traveling at 61.3 mph at 4300 RPM. I am trying to prop a 2019 Ranger 521L with the Mercury 250 pro xs4., loaded light. The GPS speed was measured using my Hummingbird unit and a phone app for GPS speed, and they both matched.
For most bass, bay boats, and runabouts the spread between cruising slip percentage and top end slip percentage should not be big. Please note that they do not hook up as well in reverse as your three blade, it will take a little longer to stop the boat and get it going in reverse. TM on bow. Bill- Your prop slip may not be that high. Later when I will see actual data it will be easier to upgrade – if needed. However, a prop must slip somewhat to work properly and efficiently. Simply, it does depend on prop pitch: Theoretical speed = pitch x prop shaft rpm (with unit-of-measure conversion constant).
Sanger Greg. boat is a12 250 pro xs 12 Nitro Z8 10 inch hydralic jp i like the 16 inch diameter would this prop work looking for more speed and what pitch would be recommened thank. G'luck. Prop slip appears to be low but it won’t hardly come out of the hole and is running 300-400 less RPM’s than I would have expected. I get 35.5 mph at 6030 rpm at 4200 ft of elevation. I sent the prop to John at DAH propellers to work his magic.
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