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Author Topic:   190 NANTUCKET: 115-HP Performance
cold feet posted 10-10-2005 07:48 AM ET (US)   Profile for cold feet  
[This thread consolidates the questions and responses of three separate articles posted to three separate forums. The inquiry is about the performance of the 190 NANTUCKET with a 115-HP four-stroke motor.]

Is [a 190 NANTUCKET with a 115-HP four-stroke motor] a dog?

[The more often this question was posted the shorter it became. In previous versions of the inquiry the author also asked:]

What do you think [of the performance of a 190 NANTUCKET with a 115-HP four-stroke motor]?

[How will it perform with] four adults with [a full tank of] fuel?

[How will it perform with] 8 adults with [a full tank of] fuel?

Is it a dog?

How much do you think I could get for a trade-in on the engine? [How much to you think it would cost to] re-power with 150 horses?

Perry posted 10-10-2005 12:06 AM ET (US)     Profile for Perry  Send Email to Perry     
With four adults with full fuel tank and the performance will be very poor. With eight adults with full tank and you may not even get up on plane.

Do a search using the search function here and you will find lots of good info about this very topic.

As for trade-in, it depends on the number of hours on the motor but I would guess you could get close to 5 grand for it.

I had the 115 four-stroke removed at the dealer and repowered with a Honda before taking delivery of my 2005 Nantucket.

Whalerider posted 10-10-2005 07:54 AM ET (US)     Profile for Whalerider  Send Email to Whalerider     
Clark Roberts posted 10-10-2005 07:58 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Sal A posted 10-10-2005 08:20 AM ET (US)     Profile for Sal A  Send Email to Sal A     
Read this:

That reference article is pretty objective and void of opinions; draw your own conclusions.

Opinions? I will give you two!

Mine: "I had the Nantucket with the 115 4 stroke and it did not suit my needs; I repowered. I had 4 or 5 people aboard most times, and going through the inlets to the ocean were scary at times. We also like to tube, and it often seemed that we were always at 5000 rpm's on this engine. It is not quiet at that rpm level. Whaler provided that marginal power to fill a 4 stroke void that they in the Nantucket lineup. Don't do it."

The other side: "I fish by myself only, and near shore at that. 90% of my usage is for trolling, and this baby sips gas! I do not pull skiers, and never have anyone aside from myself and my wife aboard. Get this motor on your Nantucket/Outrage!"


Riverwhaler posted 10-10-2005 06:49 PM ET (US)     Profile for Riverwhaler  Send Email to Riverwhaler     
Don't do it. I tried it too. After a couple of days took it back to dealer and had 150hp installed. Now it is right!
jimh posted 10-10-2005 08:57 PM ET (US)     Profile for jimh  Send Email to jimh     
[I spent a bit of time going around locating the three threads on this topic and consolidating the replies into this one. There is already a great deal of prior discussion on this topic in the archives.]

There are few 19-foot boats that can perform well with eight people and full tank of gasoline. If you know of any, let me know. All small boats are VERY sensitive to weight, and the addition of eight extra people represents an enormous increase in the total boat weight.

The worst investment is to buy (anything) at retail, use if a short period of time, and then sell it. Outboard motors are not an exception.

jimh posted 10-10-2005 10:37 PM ET (US)     Profile for jimh  Send Email to jimh     
In the Boston Whaler factory tests with two crew aboard, the boat test weight is 3,170-lbs. If we add six more people who weight 185-lbs to the boat, the boat weight will increase

6 X 185 = 1,110-lbs

giving a test weight of

3,170 + 1,110 = 4,280

We can compare the two boat weights:

4,280/3170 = 1.35 or a 35-percent increase

Speed is inversely proportional to the weight at an exponential rate of 0.5, and thus the speed will thus decrease by a factor of

SPEED REDUCTION = (1 / 1.35)^0.5
SPEED REDUCTION = (0.74)^0.5

We can predict the speed should drop to about 0.86 of the original speed. According to factory tests, the boat would run 37-MPH with the test load, so it ought to run about

0.86 X 37 = 31.8 MPH

with the eight-person load. However, I do not think you will be able to obtain this speed with the same propeller, as the engine probably will not reach full crankshaft speed under this load. You would have to drop the propeller pitch to allow the engine to reach full speed.

What propeller gives 31-MPH at 6,000-RPM? The PROPELLER CALCULATOR can easily find this for us: 12.5-inch pitch. < Compare this to the original propeller, a 14-inch pitch.

However, as mentioned by others, it is problematic if the 115-HP could ever get the boat on plane, so it may never be able to reach 31-MPH as predicted.

cold feet posted 10-12-2005 12:00 PM ET (US)     Profile for cold feet    
Thanks for the info
LHG posted 10-12-2005 02:06 PM ET (US)     Profile for LHG    
Jim - I'm letting you know!
alkar posted 10-20-2005 12:41 AM ET (US)     Profile for alkar  Send Email to alkar     
I thought of your boat too, Larry. I bet she goes like a scalded ape - even with 1200 pounds of people.

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