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190 NANTUCKET: 115-HP Performance
|Author||Topic: 190 NANTUCKET: 115-HP Performance|
posted 10-10-2005 07:48 AM ET (US)
[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?
posted 10-10-2005 12:06 AM ET (US)
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.
posted 10-10-2005 07:54 AM ET (US)
posted 10-10-2005 07:58 AM ET (US)
posted 10-10-2005 08:20 AM ET (US)
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!"
posted 10-10-2005 06:49 PM ET (US)
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!
posted 10-10-2005 08:57 PM ET (US)
[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.
posted 10-10-2005 10:37 PM ET (US)
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
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. < http://continuouswave.com/cgi-bin/propcalc.pl 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.
posted 10-12-2005 12:00 PM ET (US)
Thanks for the info
posted 10-12-2005 02:06 PM ET (US)
Jim - I'm letting you know!
posted 10-20-2005 12:41 AM ET (US)
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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