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Author Topic:   Top Speed 150 Sport
rslsail posted 10-05-2009 12:47 PM ET (US)   Profile for rslsail   Send Email to rslsail  
I just purchased a 2004 Boston Whaler 150 SPORT in pristine condition. It has a [Mercury FOURSTROKE] 60-HP EFI Bigfoot. According to the [engine controller history] the engine has 41 hours on it and has never been run hard. The engine seems to run perfectly.

Here I have been reading people's claims of top speeds of [35- to 39-MPH]. I was out on a lake this weekend with no wind or chop, and a portable GPS. Full out at about 5,600-RPM, just me in the boat, about 200-lbs, I could not get the boat [above] 27-nautical-miles-per-hour. I'd really like to know how to find additional speed.

Tohsgib posted 10-05-2009 12:52 PM ET (US)     Profile for Tohsgib  Send Email to Tohsgib     
dscew posted 10-05-2009 01:19 PM ET (US)     Profile for dscew    
Might need a propeller with a steeper pitch.
tombro posted 10-05-2009 02:43 PM ET (US)     Profile for tombro  Send Email to tombro     
My 2003 150 Sport with a 60-HP Mercury two-cycle could easily achieve these speeds, trimmed out.

I do recall the FOURSTROKE Bigfoot being a different gearing and not quite as fleet-footed.

mw011i posted 10-05-2009 02:48 PM ET (US)     Profile for mw011i  Send Email to mw011i     
I have a Montauk 150 with this same engine and it'll do about 35 [MPH?] with a Vengeance propeller. I would think the Montauk is probably a little heavier, but I'm not sure.
rslsail posted 10-05-2009 02:55 PM ET (US)     Profile for rslsail  Send Email to rslsail     
[The boat has] a stock propeller. I thought I saw something about not using a stainless steel propeller. The engine was tilted all the way down. Should I trim it at more angle?
Tohsgib posted 10-05-2009 02:58 PM ET (US)     Profile for Tohsgib  Send Email to Tohsgib     

Trim it till she starts to slip, then tap back down until it grabs, should see 35.

Tohsgib posted 10-05-2009 02:59 PM ET (US)     Profile for Tohsgib  Send Email to Tohsgib     
PS..get a stainless steel propeller. Alum is for jon boats ;)
Tom W Clark posted 10-05-2009 03:27 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
27 knots = 31 MPH.

You should be using a Mercury 13-1/8" x 14" Vengeance or Stiletto 13-1/4" x 13" Advantage 4.25 propeller and getting 35-36 MPH at about 6000 RPM.

You'll never get anything close to that if you do not trim your motor out to optimize the speed and handling.

Tom W Clark posted 10-05-2009 03:28 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
If using a stainless steel propeller on that motor be sure to use a Mercury Flo-Torq III hub kit to help alleviate prop rattle and shift clunk.
elaelap posted 10-05-2009 04:53 PM ET (US)     Profile for elaelap  Send Email to elaelap     
Interesting. My little classic 15 center console easily exceeds 40 mph with essentially the same motor (a Yamaha 60 hp four stroke in my case), with a stock Yamaha aluminum 15" pitch prop: current=Lourdesropa2066.jpg

Difference in weight, I imagine, because those 'Accutrack' (sp?) hulls on the 150s, 170s, and 190s are noted for their swiftness.


elaelap posted 10-05-2009 04:54 PM ET (US)     Profile for elaelap  Send Email to elaelap     
Whoops!, apples & oranges. I failed to notice that your motor, unlike mine, is Bigfoot geared.
rslsail posted 10-05-2009 04:56 PM ET (US)     Profile for rslsail  Send Email to rslsail     
13-1/8" x 14" doesn't seem to be a size
fishgutz posted 10-05-2009 05:27 PM ET (US)     Profile for fishgutz  Send Email to fishgutz     
13 1/8" is the Diameter. 14" is the pitch. Pitch is essentially the distance it travels in one revolution of the prop.
Tom W Clark posted 10-05-2009 05:35 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     

A 2004 150 Sport is nothing like your classic Sport 15 and it is not an Accutrack hull either.

With its 900 pound weight and 6' 6" beam, it is MUCH larger than the classic 15 footer.

rslsail posted 10-05-2009 05:37 PM ET (US)     Profile for rslsail  Send Email to rslsail     
I understand the dimensions, I just don't think [Mercury Marine] make a VENGEANCE prop in that size, at least I couldn't find it on-line.
Tom W Clark posted 10-05-2009 05:38 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
Correction: 13-3/8" x 14" Mercury Vengeance, part # 48-17314
Tom W Clark posted 10-05-2009 05:40 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark vengeance-propeller-13-3-8-x-14-rh-ss-3-bl-p733.html
elaelap posted 10-05-2009 05:51 PM ET (US)     Profile for elaelap  Send Email to elaelap     
You're a new member, rslsail. If you stick around, you'll learn never to question Tom Clark's statements here. Like the Pope, he is (mostly) infallible.


ratherwhalering posted 10-05-2009 06:56 PM ET (US)     Profile for ratherwhalering  Send Email to ratherwhalering     
It appears that the Emperor has no clothes.
bloller posted 10-05-2009 08:15 PM ET (US)     Profile for bloller  Send Email to bloller     
I have [for sale] the aforementioned Stiletto prop 13 1/4 x 13. It performed very similarly to the 13 3/8 x 14 Vengeance that I decided to stick with. My boat is a 1970 16' with a 2004 60hp Mercury Fourstroke EFI Bigfoot. You definately will want a Flo Torq III if you go to a stainless prop over the A30 series gray Mercury aluminum.
Tom W Clark posted 10-05-2009 08:31 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
Hey! I resemble those comments.
jimh posted 10-05-2009 10:18 PM ET (US)     Profile for jimh  Send Email to jimh     
[Moved to POST-CLASSIC.]
ryland posted 10-06-2009 12:11 AM ET (US)     Profile for ryland  Send Email to ryland     
I have a 2004 150 Sport with 60-HP BIGFOOT that goes 35- to 40-MPH with no problem with just me on board.
wldrns1 posted 10-06-2009 08:32 AM ET (US)     Profile for wldrns1  Send Email to wldrns1     
My 2008 150 Sport came with the SS 17314 prop mentioned above. I found engine rpms exceeded 6k. I went with the Vengeance 13 1/4 x 15 854354 which is a new part number. Max RPM's trimmed out is now in spec. Top speed is 37-39 depending on condition. Definately get a Flo Torq III hub kit to eliminate prop rattle. There are some older Posts with this exact comparison in the Performance section.

I'm near Syracuse if you want to go for a spin in mine or try the original 14p and/or my new 15p. I also have a Black Max 15p I keep as a spare. Your welcome to try them all here if you like but none are for sale.


elaelap posted 10-06-2009 04:52 PM ET (US)     Profile for elaelap  Send Email to elaelap     

And Joe's kind offer above is the true ethos here (except when some folks--never ever me!) start wandering off into lumpy political seas. I've sailed, surfed & dived almost all of my life, but when I bought my first motorboat (not counting dinks)--an ancient Katama Whaler--I discovered this place and I've never looked back. I can't imagine finding anywhere else with more helpful information about boating in general and Whalers in sometimes incredibly boring minutiae, and even though we rag each other on occasions about non-boating-related issues, it's really a great virtual family gathering--the genetic link being our love for these sometimes-exasperating hunks of fiberglass, foam and stainless steel. Welcome!


Buckda posted 10-06-2009 04:55 PM ET (US)     Profile for Buckda  Send Email to Buckda     
Tony -

My father remarked on the same thing on Sunday afternoon after returning from his first ever rendezvous...

rslsail posted 10-10-2009 06:39 PM ET (US)     Profile for rslsail  Send Email to rslsail     
Hi guys, just went out and with a little trimming got the boat up to 31 knots, thanks for the advice
ScottS posted 10-15-2009 04:04 PM ET (US)     Profile for ScottS  Send Email to ScottS     
31 knots = 35.6 MPH, so it sounds like your trimming puts you in line with what most others have reported.

I've got a 2004 150 Sport with 60 FourStroke EFI BigFoot and 13-3/8D x 14P Stainless Vengeance on a Flo-torq III hub. I also reach between 35 and 36 MPH. If you upgrade to a stainless prop be sure to get the Flo-torq III hub like Tom suggested to reduce/eliminate clunks/rattles. I'm very happy with the performance of this prop no matter how much weight I have in the boat (just me or whole family with lots of gear).

The Whaler website shows 35.1 MPH for the 150 Montauk with the same motor and prop I have. If I remember correctly, Whaler's testing of the 150 Sport with the same motor and prop was just a few tenths faster.

On the Mercury site they did a test with a 10 3/8" x 14" Vengeance stainless prop and only reached a top speed of 33.9 MPH. Filter=9,11,10,12

Ryland, how are you able to reach 40 MPH? Is this per a GPS or speedometer? Do you have a different prop or some other modification?

rslsail posted 10-15-2009 05:28 PM ET (US)     Profile for rslsail  Send Email to rslsail     
Great info Scott thanks! And to everybody, you all seem to be coming to the same conclusions
rslsail posted 10-15-2009 05:35 PM ET (US)     Profile for rslsail  Send Email to rslsail     
WOW, that prop is over $500???? Hummm not sure if those 2 knots would be worth it

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