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Old 11 July 2013, 18:24   #1
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Country: USA
Town: Tilghman Island
Boat name: Stormhammer
Make: Mk 2 Futura HD
Length: 3m +
Engine: 50 HP Evinrude ETEC
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Setup for Zodiac Mark II HD with console

Hello all!

I have a 2010 zodiac futura mk 2 alu, with console and a new 50 hp ETEC.

I need some setup help, to achieve max performance/speed.

I currently have a 14inch 19 pitch prop, and the diameter is and estimate.

The motor is as low as it can go, and is too low for sure, getting lots of water blowback into the boat.

Speed is topped out at 25 mph and RPM is 6000 to 6100 WOT.

So to anyone who actually owns a futura mk two, what is the depth/distance of your anti cav plate from the exact bottom of the transom?

What diameter and pitch prop are you using? My Evinrude dealer is ordering me a stainless 21 pitch prop, which I hope will bring down the rpm and raise the speed.

The hole shot on this boat is insane, like being launched on a rocket. I don't mind loosing some of that punch for a faster boat.

So any help you can give me to steer me into the right direction is greatly appreciated!

CAP
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Old 11 July 2013, 18:29   #2
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Country: USA
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Make: Mk 2 Futura HD
Length: 3m +
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Posts: 45
Sorry about the double video...
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Old 12 July 2013, 15:32   #3
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Country: Canada
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Looks like water splashing up from under your floor at the transom or is that coming over the transom?
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Old 12 July 2013, 20:38   #4
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Country: USA
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The spray is coming over the transom. Its from the motor. Its definitely too low. My Evinrude dealer where I live does not have much experience with sibs or ribs. I read on a thread here somewhere that the anti cav plate should at one inch below the keel.

My zodiac is a 2010 model year, but its new off the shelf from Defender Marine of CT. And I have a five year warranty from date of purchase, which was about a month ago.

I find it frustrating that Zodiac doesnt specifically say where the anti cav plate should be. Because this boat has three distinct levels, the keel, the speed tubes, and the main tubes.

If i can get the speed up to mid 30's I'll be happy as a lark.

I really want to dial the performance of this boat in, I get a lot of compliments on her, and they are very uncommon around my parts. Well I think in the USA in general. I think with my 50 etec I should easily get mid 30s. So its a matter of dialing in the prop, and the cav plate to the right parameters.
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Old 12 July 2013, 21:01   #5
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Country: USA
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Old 12 July 2013, 21:27   #6
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Looks really low to me. General consensus is start out with anti vent plate even with keel. Test it, then raise it, test again, raise again, etc. If it doesn't blow out during turns, you're ok. That is for ribs, not sibs but the process should be the same. Also, i'd make sure all chambers are completely full to around 3 psi. Less rigidity will definitely affect speed.
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Old 12 July 2013, 22:29   #7
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Country: USA
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Thanks for the info mate. I use an elelctric air pump made by seamax, and I recheck air pressure after she's put in the water too.
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Old 13 July 2013, 09:59   #8
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Country: UK - England
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I almost went for the exactly the same boat as you, but decided on a 4.2m rib with 50hp instead. I still like the futura a lot as it's unique and also very rare compared to normal ribs and sibs!

You should be getting a lot more speed than 25 mph, from memory zodiac quote 37 mph for your boat! According to my gps I can hit 38.5 mph with just me in the boat, and that's with the stock Tohatsu 11.1 x 13 prop. In fact I actually hit my rev limiter at 6000 rpm with this prop and so I am going to buy an 11 x 15 prop soon to bring my WOT revs to within the recommended rpm (5150 - 5850 rpm), this should also hopefully give me a couple of extra mph top speed!

I must admit your prop seems huge to me compared to mine!! As you say your engine must be mounted too low. Are you able to adjust the height yourself and keep testing the boat until you get it right? If not and to be honest I would have thought this should have been the dealers job to get right from day one surely?!
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Old 13 July 2013, 11:46   #9
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Country: USA
Town: Tilghman Island
Boat name: Stormhammer
Make: Mk 2 Futura HD
Length: 3m +
Engine: 50 HP Evinrude ETEC
Join Date: Jul 2013
Posts: 45
Update: Moved the motor up so anti cav plate is one inch above the keel, and had the 13 7/8 diameter prop with a 21 pitch installed.

Im up to 36 MPH, which is AWESOME! However, the motor was WOT at 4800 rpm. My mechanic said we need the motor to be between 5500 and 5800 rpms. So getting closer! LOVE THIS BOAT!~!

J@mes, your right about the dealer should be tweaking if he wasnt my friend. He does the labor and I do the testing. Which of course he isnt going to charge me for everytime I bring the boat in to adjust. He's had no experience with SIBs or Ribs. The are extremely uncommon where I live, most people use whalers, grady whites and Bay liners. Also, I live like ten minutes from the shop, so its all good.
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Old 13 July 2013, 12:08   #10
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Country: USA
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Boat name: Stormhammer
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Length: 3m +
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Join Date: Jul 2013
Posts: 45
@ J@mes: I sent an email regarding the 37 mph to Defender Marine the zodiac dealer where I got my furura. He basically said, oh that does not mean it will go 37, but that is the max speed of the hull. Also, he said that speed notation was footnoted, saying it was a professional driver with a special prop. I was like HUH? Then he went on to say that they didn't have specific performance charts on that boat, so he couldnt even recommend a prop to use.

Also Zodiac of North America has absolutely no links for product support at all. You have to contact the dealers. I cant believe they dont have performance data from the R&D section of Zodiac. Its not like this boat is a brand new design.
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