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#12439859 - 09/24/17 05:17 PM Four Blade Prop Question
Bob Landry Offline
Extreme Angler

Registered: 08/10/11
Posts: 2836
Loc: Austin, Tx
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
2018 Robalo R180 CC, Yamaha 115

Bitter Gun Owner
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#12439868 - 09/24/17 05:25 PM Re: Four Blade Prop Question [Re: Bob Landry]
Monkeypuncher Offline

Registered: 07/12/17
Posts: 173
Loc: Cedar Creek Lake
The four blade will allow the boat to plane faster and at a slower speed. I think it's just what you need.

#12439870 - 09/24/17 05:26 PM Re: Four Blade Prop Question [Re: Bob Landry]
grout-scout Online   content
TFF Celebrity

Registered: 12/08/08
Posts: 7149
Loc: Boerne, Texas
You might be better off with a 5 blade for maximum takeoff & lift.

#12443424 - 09/26/17 08:50 PM Re: Four Blade Prop Question [Re: Bob Landry]
NCSkeeter Offline

Registered: 05/19/10
Posts: 58
Loc: Lake Gaston, NC & Holly Spring...
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.

#12453672 - 10/05/17 12:11 AM Re: Four Blade Prop Question [Re: Bob Landry]
Curtbass Online   content
Extreme Angler

Registered: 04/17/15
Posts: 1646
4 blade will have better stern lift.
92' ChampioN 201DCR Elite
13' Yamaha250SHO

#12456403 - 10/07/17 07:13 AM Re: Four Blade Prop Question [Re: Bob Landry]
Muzzlebrake Offline
Extreme Angler

Registered: 12/26/14
Posts: 1664
Loc: Euless
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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