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Old 15 October 2017, 00:10   #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 from twins to single 200

I posted this in the wrong forum initially!

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?

3. Boat performed decently with The twin f115s, will the switch to a single 200 be a step up or status quo?

Thanks in advance

Shahid
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