Finally got to swap the prop and test it today, the new PowerTech OFS4.
OEM - SWS2
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Swapped with this:
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The conditions were perfect... for the purpose of this test!
4-5ft chop with 6s period. Ouch.
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It was really crappy, I could barely hold the phone to take pics.
Normally, I wouldn't go out in these conditions but it was the exactly right sea state for testing my working assumptions for the new prop.
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RESULTS:
The long and short,
the OFS4 exceeded all expectations.
As stated at the beginning of this thread, I was hoping to accomplish better ride in rough conditions, in this regard this prop exceed expectations, and there appear to be additional benefits.
PROS:
Most important: the boat can stay on plane and plow through some big stuff at 15-20mph at ~3,500 RPM, no tabs
The hole shot is quicker
Midrange torque is improved and the boat seems more agile
The motor seems more quiet at mid/high RPM (that was a complete surprise to me)
The WOT ~45mph, max trim w/o cavitation ~6,000 RPM (it was 50mph, ~5,800 with OEM)
CONS (sort of)
There is a touch of vibration/chatter while idling in gear at 500-600 RPM, goes away around 800 RPM
WOT speed 4-5mph lower in flat water (that was expected, it went from 50mph with SWS2 to ~45mph with OFS4)
Up or down the channel:
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FUEL BURN
TBD.
Based on today's results, there is no question this prop will give better fuel economy in rough conditions.
For example, with conditions like today and needing to slow down to <20mph - the factory SWS2 couldn't keep the boat on plane while the OFS4 allows the boat to stay on plane and just plows through 4fters.
In head sea I was doing close to 20mph, and around 30-35mph in following where these boats seem to excel.
The SWS2 (OEM) is fantastic in flat water, top speed ~50mph, and probably better fuel economy. I will miss that on the last few miles each trip coming back to the marina in the channel, it is usually pretty flat and I go WOT.
BUT - for going offshore around here - the OFS4 rocks.
Many thanks to Ken at Prop Gods, his recommendations with this prop were spot on, the prop does exactly what I was hoping it would.
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