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Dec 30th, 2023
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 Four Blade Prop Question
#12439859
09/24/17 10:17 PM
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Joined: Aug 2011
Posts: 2,957
Bob Landry
OP
Extreme Angler
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OP
Extreme Angler
Joined: Aug 2011
Posts: 2,957 |
My wife has a new Robalo R180 with a Yamaha 115. We use it primarily for knee boarding, tubing, etc. Most of the time when pulling I'm running around 3200-3400 RPM and the stern is really squatting and the bow pointed at the sun.
I know a four blade will cost me a little on the top end, but I seldom run WOT so speed is not a factor. The prop it came with gives 30MPH @5000 and that's what Yamaha says it should do with my boat.
Just wondering if a four blade would give the stern some lift at the slower speeds.
2015 Seaark 1872 MV CC Etec-90
Two Helix 12 CHIRP SI's, , MinnKota Riptide ST80/i-pilot Link, Bob's Hydraulic
2020 Robalo R200 CC, Yamaha 150
Bitter Gun Owner
Bitter Clinger
Armed Infidel
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Re: Four Blade Prop Question
[Re: Bob Landry]
#12439868
09/24/17 10:25 PM
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Joined: Jul 2017
Posts: 175
Monkeypuncher
Outdoorsman
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Outdoorsman
Joined: Jul 2017
Posts: 175 |
The four blade will allow the boat to plane faster and at a slower speed. I think it's just what you need.
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Re: Four Blade Prop Question
[Re: Bob Landry]
#12439870
09/24/17 10:26 PM
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Joined: Dec 2008
Posts: 16,189
grout-scout
TFF Guru
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TFF Guru
Joined: Dec 2008
Posts: 16,189 |
You might be better off with a 5 blade for maximum takeoff & lift.
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Re: Four Blade Prop Question
[Re: Bob Landry]
#12443424
09/27/17 01:50 AM
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Joined: May 2010
Posts: 61
NCSkeeter
Outdoorsman
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Outdoorsman
Joined: May 2010
Posts: 61 |
My Skeeter fish and ski with an F115 outboard had the same problem. I tried a cheap aluminum four blade Solas prop and it made a big difference. You may need to drop to a lower pitch to still achieve the same WOT RPMs. I think I dropped 2", but the 4 blade prop is cupped and the original 3 blade wasn't so it was really only like dropping 1". I actually didn't lose much, if any off of top speed.
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Re: Four Blade Prop Question
[Re: Bob Landry]
#12453672
10/05/17 05:11 AM
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Joined: Apr 2015
Posts: 1,818
Curtbass
Extreme Angler
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Extreme Angler
Joined: Apr 2015
Posts: 1,818 |
4 blade will have better stern lift.
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Tight lines & stay safe out there.Gods blessings
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Re: Four Blade Prop Question
[Re: Bob Landry]
#12456403
10/07/17 12:13 PM
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Joined: Dec 2014
Posts: 1,665
Muzzlebrake
Extreme Angler
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Extreme Angler
Joined: Dec 2014
Posts: 1,665 |
While my Tracker Avalanche with the EFI 150 Merc is not known to be a fast boat, the 4 blade 21P trophy plus I replaced the 3 blade 23P Tempest Plus with is beyond my expectations. 3 times faster hole shot and more top speed.
Thursday the lake was like glass and I finally got to open it up and trim it out WOT. GPS showed 63.1 mph with 2 people and 1/2 tank gas with full load of gear. 58 mph was all the 3 blade 23P Tempest would ever do.
I like the fact that I can now run on pad 10 mph slower and not porpoise. Cruising at 3800 rpm is saving me lots of fuel over having to run the motor at 4200 to stay on pad.
From Genesis: "And God promised men that good and obedient wives would be found in all corners of the earth."
Then He made the earth round...and He laughed and laughed and laughed!
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