SPORT 15 with Suzuki DF60a Performance Data

Optimizing the performance of Boston Whaler boats
Mattzilla5
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SPORT 15 with Suzuki DF60a Performance Data

Postby Mattzilla5 » Fri Apr 14, 2023 8:41 pm

Test results from recent re-powering of a SPORT 15:

BOAT: 1978 SPORT 15
ENGINE: 2023 Suzuki DF60a
TEST CREW: two adults
FUEL: 6-gallons

PROPELLER PowerTech
FAMILY or MODEL: TBA
MATERIAL: Stainless steel
NUMBER OF BLADES: TBA
PITCH: 17-pitch
DIAMETER: possibly is 11.25-inches

Wide-open Throttle Performance
ENGINE SPEED: cited only as just below the rev-limiter of 6,300-RPM
ENGINE TRIM: cited as 6-percent
BOAT SPEED: 42 to 43-MPH

BOAT SPEED and FUEL ECONOMY: see below.

boat2.jpg
Fig. 1. 1978 SPORT 15 with SUZUKI DF60a
boat2.jpg (37.9 KiB) Viewed 4438 times

jimh
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Re: SPORT 15 with Suzuki DF60a Performance Data

Postby jimh » Sat Apr 15, 2023 10:20 am

Please mention more detail:
  • number of cylinders for DF60a
  • displacement of DF60a
  • weight of DF60a
  • block configuration of DF60a
  • engine gear ratio
  • propeller model or family designation
  • propeller number of blades
  • engine speed at full-throttle reported boat speed
  • boat speed for 15-MPG fuel economy

The boat looks very nice with the white engine paint.

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Phil T
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Location: Was Maine. Temporarily Kentucky

Re: SPORT 15 with Suzuki DF60a Performance Data

Postby Phil T » Sat Apr 15, 2023 11:12 am

Please add-

Engine mounting height. How many empty holes above the top bolt?
Prop manufacturer, model and size. i.e. PowerTech SCD3 13x17.
Speed and rpm when initially on plane.
Speed at each 1000 rpm
Top speed and rpm at full throttle (WOT)
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Jefecinco
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Re: SPORT 15 with Suzuki DF60a Performance Data

Postby Jefecinco » Sat Apr 15, 2023 12:23 pm

WOT speed of 43 MPH in your Sport 15 must have been exciting.
Butch

Mattzilla5
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Re: SPORT 15 with Suzuki DF60a Performance Data

Postby Mattzilla5 » Sat Apr 15, 2023 1:37 pm

It was. Very smooth and comfortable, however, when compared to the old 2-stroke I had before screaming in my ear.

Mattzilla5
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Joined: Sat Apr 21, 2018 8:14 am

Re: SPORT 15 with Suzuki DF60a Performance Data

Postby Mattzilla5 » Fri Apr 21, 2023 12:03 pm

One adult on board, only 6-gallons of fuel:
ENGINE SPEED = 3400 RPM
BOAT SPEED = 22.4 MPH
FUEL FLOW = 1.4 GPH
ECONOMY = 15.7 MPG

grizzly
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Re: SPORT 15 with Suzuki DF60a Performance Data

Postby grizzly » Fri Apr 21, 2023 10:00 pm

[As seen in Figure 1 above the SUZUKI DF60a engine] looks big or oversized on the transom of the SPORT 15.

Q1: how does the size of SUZUKI DF60a compare to the YAMAHA F70?

TFrere
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Re: SPORT 15 with Suzuki DF60a Performance Data

Postby TFrere » Fri Apr 21, 2023 11:55 pm

The Suzuki DF60a may appear larger but weighs less than the Yamaha.

Suzuki DF60a = 229-lbs
Yamaha F70 = 254-lbs
1985 15’ Sport with Yamaha F70

jimh
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Re: SPORT 15 with Suzuki DF60a Performance Data

Postby jimh » Sat Apr 22, 2023 7:04 am

grizzly wrote:[As seen in Figure 1 above the SUZUKI DF60a engine] looks big or oversized on the transom of the SPORT 15.
The DF60a engine does appear in Figure 1 as a rather large engine for the SPORT 15, but I think that appearance is related to the way the boat is arranged in the photograph and the position of the camera.

Mattzilla5
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Re: SPORT 15 with Suzuki DF60a Performance Data

Postby Mattzilla5 » Sat Apr 22, 2023 9:06 am

The Suzuki DF60a has a small gear case, which accounts for some of the [difference] in engine weight [perhaps means compared to the Yamaha F70 engine which by inference is presumed to have a large gear case].

engineAndWake.jpg
Fig. 2. Engine mounting and clean wake when at speed.
engineAndWake.jpg (64.16 KiB) Viewed 4237 times


gearcase.jpg
Fig. 3. The gear case position relative to water flow at speed.
gearcase.jpg (45.49 KiB) Viewed 4238 times


The appearance of the engine as being "large" may be due to the engine mounting height in use. The [shallow splash well of the SPORT 15 boat] would not allow the engine to be mounted any lower.

The data [given in an earlier post to this thread] were [computed from the speed solution] from a GPS receiver; the engine trim was at "zero."

IMPORTANT NOTE TO PHOTOGRAPHER: DO NOT HOLD YOUR CAMERA IN THE VERTICAL OR PORTRAIT ORIENTATION WHEN TAKING PHOTOGRAPHS TO BE USED AS INLINE ILLUSTRATIONS IN HTML.

jimh
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Re: SPORT 15 with Suzuki DF60a Performance Data

Postby jimh » Sun Apr 23, 2023 1:39 pm

Figure 3 shows a very nice orientation of the anti-ventilation plate relative to the flow of water around the gear case. I do not see any need to increase the trim OUT from what was used when this image was photographed. The TRIM looks perfect.

What is the engine mounting height of the DF60a engine on the SPORT 15 as measured in units of holes raised from the lowest possible position?

(Second request for this information; reports of performance should always mention the engine mounting height.)

rich_
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Joined: Wed May 17, 2023 12:45 pm

Re: SPORT 15 with Suzuki DF60a Performance Data

Postby rich_ » Wed May 17, 2023 1:03 pm

A SPORT 15 boat speed of 42 to 43-MPH is great for the setup [described above in this report on performance of a SPORT 15 with a SUZUKI DF60a engine].

Mattzilla5
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Re: SPORT 15 with Suzuki DF60a Performance Data

Postby Mattzilla5 » Fri Jul 21, 2023 11:23 am

[The engine mounting height is shown below in Figure 4; the engine mounting height is three-holes-up from lowest possible position.]

IMG_1050.jpeg
Fig.4. Engine mounting at three-holes up position.
IMG_1050.jpeg (140.99 KiB) Viewed 3497 times