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Old 20 January 2016, 08:49   #11
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Country: UK - England
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I know its an old thread but I just thought I'd close it out.....

I got the Merc 115 4 stroke in the end. It was released just as I was looking and came in at 163kg. It has now been on for about a year, although only about 25 hrs due to crap weather with no problems. The boat sits level and is incredibly quick on the plane, topping out at about 35-36kts at about 5600rpm on a 17" ali prop. It does around .9-1.4 nm per liter.

Phil M
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Old 20 January 2016, 08:52   #12
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another satisfied customer, happy/ safe boating. Did you try a stainless prop?
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Old 20 January 2016, 09:43   #13
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The boat sits level and is incredibly quick on the plane, topping out at about 35-36kts at about 5600rpm on a 17" ali prop. It does around .9-1.4 nm per liter.
What kind of load for 35kt@5600rpm w/ 17" alu prop? 4 divers + 1 operator?
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Old 20 January 2016, 12:16   #14
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Country: UK - England
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It was lightly loaded, 2 or 2 1/2 people and no kit. The weather has been rubish for the last year so i haven't dived much. We need 2 weeks of fine weather for the adult to settle and it just hasn't happened.

I haven't tried a stainless prop yet. Really i need to see the performance loaded before i decode which way to go. I'm happy with the top speed as it is rarely calm enough to go that fast anyway on the 530 hull.

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Old 20 January 2016, 15:56   #15
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It was lightly loaded, 2 or 2 1/2 people and no kit. The weather has been rubish for the last year so i haven't dived much. We need 2 weeks of fine weather for the adult to settle and it just hasn't happened.

I haven't tried a stainless prop yet. Really i need to see the performance loaded before i decode which way to go. I'm happy with the top speed as it is rarely calm enough to go that fast anyway on the 530 hull.

Phil M
Thanks Phil! I've been debating on a 90hp or 115hp for my Avon dive boat, which is a little longer and the tube diameter is a little larger than the Pro 530. Performance should be close though.
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Old 20 January 2016, 16:06   #16
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With the mercs, they are the same weight so no real argument not to go 115. Apart from cost i guess. Beautiful engine though. The smartcraft gauges are really good and it is almost silent on tick over.

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Old 20 January 2016, 16:37   #17
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With the mercs, they are the same weight so no real argument not to go 115. Apart from cost i guess. Beautiful engine though. The smartcraft gauges are really good and it is almost silent on tick over.

Phil M
I was going to go with a Yamaha F115 4st.... 171kg.
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Old 20 January 2016, 16:58   #18
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Merc is 163kg. Its the main reason i chose it.

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Old 09 March 2016, 19:53   #19
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At what speed and loads were you obtaining the .9 to 1.4 nm/liter? I am still debating between a Suzuki DF90 or a Yam/Merc 115 and it's coming down to how much difference the fuel efficiency will be with respect to how much speed I will gain if I go with the 115...too many choices
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Old 10 March 2016, 07:22   #20
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Country: UK - England
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Boat name: Pegasus
Make: Zodiac Pro 530
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Engine: 115hp Merc 4st
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Light loads, 2-3 medium bodies, 50ish liters of fuel, 17" prop and averaging around 20 kts I guess. That will include a reasonable amount of tick-over, waiting for lock gates to open etc. Top speed is just over 35kts but probably against wind and tide. I don't get much chance to fully open up as the sea is rarely flat enough around here. I used to get a similar, although slightly less top speed from a 75 clamshell with one on board but it ate fuel and the acceleration was poor compared to the 115. That was also 1 up, with the smaller, lighter console and smaller fuel tanks. I took 4 single tank divers out for a short trip once with the 75 and it was struggling to plane. I have no doubt that the 115 will manage with ease.

One thing worth noting is that the 530 changed at some point. Mine is the very old and very heavy hull with the vertical reverse chines and thick transom returns. It doesn't have the lip at the top of the transom. There may be a weight difference between the early and later models. I think my hull only weight is in the order of 250kg, according to the plate. It pushes 650kg without passengers or kit.

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