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Old 13 October 2017, 01:45   #1
Member
 
Country: India
Town: Mumbai
Boat name: Pathfinder
Make: Zodiac
Length: 7m +
Engine: 2 X Yamaha F115s
Join Date: Feb 2009
Posts: 66
Repowering a Zodiac Medline III

Dear All

I intend to repower my Zodiac Medline III (7.3 m LOA) Rib with a 200 HP Suzuki 4 Stroke Inline 4.

The boat currently is fitted with twin Yamaha F115 motors (Long Shaft)

The shift to single is mainly on account of the fact that the boat is on a swinging mooring and the twins sit really low in the water (especially after a retube a few years ago). Being in a high corrosion tropical environment, it is murder on the trim units! Im hoping the reduction weight of about 130 Kgs. will be sufficient to raise the transom by enough to make a difference.

Plus maintaining two old engines in this environment was really expensive!

I would very much appreciate all of your inputs on the following:

1. Propeller Size for the 200 Hp inline 4. The Boat weighs in at 1400 Kgs. plus engine. Would like to have good efficiency and top end speed rather than brute acceleration. Looking at 3 blade 151/4" dia x 19 Pitch vs 16 Dia X 18.5 Pitch.

2. Will an XL Shaft Length be ok for a single engine configuration on this RIB?

Thanks in advance

Shahid
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Old 13 October 2017, 08:36   #2
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Country: USA
Town: S. Carolina
Boat name: D560
Make: Avon
Length: 5m +
Engine: 2016 Merc 115hp CT
Join Date: Aug 2013
Posts: 1,251
Quote:
Originally Posted by shahid View Post
Dear All

I intend to repower my Zodiac Medline III (7.3 m LOA) Rib with a 200 HP Suzuki 4 Stroke Inline 4.

The boat currently is fitted with twin Yamaha F115 motors (Long Shaft)

The shift to single is mainly on account of the fact that the boat is on a swinging mooring and the twins sit really low in the water (especially after a retube a few years ago). Being in a high corrosion tropical environment, it is murder on the trim units! Im hoping the reduction weight of about 130 Kgs. will be sufficient to raise the transom by enough to make a difference.

Plus maintaining two old engines in this environment was really expensive!

I would very much appreciate all of your inputs on the following:

1. Propeller Size for the 200 Hp inline 4. The Boat weighs in at 1400 Kgs. plus engine. Would like to have good efficiency and top end speed rather than brute acceleration. Looking at 3 blade 151/4" dia x 19 Pitch vs 16 Dia X 18.5 Pitch.

2. Will an XL Shaft Length be ok for a single engine configuration on this RIB?

Thanks in advance

Shahid
I sent you a private message.
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Richard
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Old 13 October 2017, 11:14   #3
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Country: UK - England
Town: Basingstoke
Make: Ribeye 785s
Length: 8m +
Engine: Honda 225 K3
MMSI: 232018159
Join Date: Oct 2012
Posts: 101
rule of thumb is 1 inch of diameter is equal to 1 1/2 to 2 inches of pitch.
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Old 16 October 2017, 08:23   #4
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Country: India
Town: Mumbai
Boat name: Pathfinder
Make: Zodiac
Length: 7m +
Engine: 2 X Yamaha F115s
Join Date: Feb 2009
Posts: 66
Quote:
Originally Posted by totallydave View Post
rule of thumb is 1 inch of diameter is equal to 1 1/2 to 2 inches of pitch.
Thanks Dave!

Any recommendations for ideal prop size for my application?
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Old 16 October 2017, 08:24   #5
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Country: India
Town: Mumbai
Boat name: Pathfinder
Make: Zodiac
Length: 7m +
Engine: 2 X Yamaha F115s
Join Date: Feb 2009
Posts: 66
Quote:
Originally Posted by office888 View Post
I sent you a private message.
Hi Richard,

Thanks. I sent you a reply with my email, can you confirm receipt?

Best
Shahid
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Old 16 October 2017, 08:47   #6
Member
 
Country: USA
Town: S. Carolina
Boat name: D560
Make: Avon
Length: 5m +
Engine: 2016 Merc 115hp CT
Join Date: Aug 2013
Posts: 1,251
Quote:
Originally Posted by shahid View Post
Hi Richard,

Thanks. I sent you a reply with my email, can you confirm receipt?

Best
Shahid
Got it! I'll send you an email this morning.

PS: With a single engine, the boat requires an XL (25") shaft engine.
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