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Old 02 January 2017, 02:09   #1
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Country: USA
Town: Alaska
Boat name: Zodiac Hurricane 733
Make: Zodiac
Length: 7m +
Engine: 200hp - Volvo Diesel
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Bow Rise question - Zodiac Hurricane 733

Hey guys, I have been running a Hurricane 500 for the past 10 years up here in Alaska and i just bought a Hurricane 733 from the U.S Coastguard in an auction. I have been looking for a 7m RIB for a long time and finally found one and i am very happy with it.

It is the 200hp Inboard Turbo-Diesel Version. (Volvo TAMD41-A) The entire transom is completely reinforced by stainless steel and has towing brackets and rigging mounts all around. The Boat is very heavy, i estimate it to be in the 6000lb range. This Boat was used for towing, freighting & rescue for the U.S Healy Ice-breaker up in the Arctic up until spring 2016, the GPS still has thousands of Nautical miles of data recorded North of Iceland and the Chukchi sea, pretty awesome..

Anyways...

One thing i noticed with this Rib however is that the Bow-rise is a little high and the the boat does not completely plane until i am at the 3800 Rpm range which is to high for this motor to be run at. The outdrive is trimmed down as far as it can go @ -4 trim. I was thinking about installing trim tabs but am unsure if the bow is supposed to be elevated like this. The Helm and Console are huge and are both located at the stern so this does not help i imagine.

I do however plan to purchase 6 15 gallon fuel drums to tie down at the bow, maybe a couple hundred pounds on the bow will help a bit?


Do any of you have trim tabs on your ribs?
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Old 02 January 2017, 18:33   #2
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Good find! Any pics? Is the motor in the middle of the boat, and on a jack shaft setup?

Thats the same motor that was in my 7.4 Searider. Whats your top speed at 3800 RPM?
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Old 02 January 2017, 19:11   #3
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I've seen plenty of ribs with tabs on and they certainly help on a hard boat so I'd say they should help with your problem.
I'd be trying to move weight forward rather than adding more weight if you can unless you require the extra fuel for increased range
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Old 02 January 2017, 21:58   #4
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Country: USA
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Boat name: Zodiac Hurricane 733
Make: Zodiac
Length: 7m +
Engine: 200hp - Volvo Diesel
Join Date: Feb 2015
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Quote:
Originally Posted by tworotorturbo View Post
Good find! Any pics? Is the motor in the middle of the boat, and on a jack shaft setup?

Thats the same motor that was in my 7.4 Searider. Whats your top speed at 3800 RPM?

The Motor is located at the middle of the Rib, which i looked up the specs of the Volvo Tamd41-A and the dry weight of the motor is 1100lbs (Not encluding outdrive, shaft, 5 gallons of oil 5 gallons of coolant etc) It has a indeck 50 gallon fuel tank in front of the engine towards the bow so i thought that would be good for weight distribution but bow is still riding high.

The Rib also Porpoises on 2-3ft rollers as well, i just needed to know if it was unheard of to install Tabs on ribs and apparently it is not so i think that is what i will do.

It is definitely not a speed boat, with a 15x19 prop WOT=30mph Cruises about 23 mph. The motor is rated for a WOT of 3800rpms and i am reaching 4100 rpms with current prop so i think i can squeeze a little more but i want all the power i can get because i usually travel heavy.



Cant get images to attach to anything i post for some reason.
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Old 02 January 2017, 22:08   #5
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Country: USA
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Boat name: Zodiac Hurricane 733
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Length: 7m +
Engine: 200hp - Volvo Diesel
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Originally Posted by beamishken View Post
I've seen plenty of ribs with tabs on and they certainly help on a hard boat so I'd say they should help with your problem.
I'd be trying to move weight forward rather than adding more weight if you can unless you require the extra fuel for increased range

Yes, i need the increased range so the 15gallon fuel drums on the front is a must.
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Old 02 January 2017, 22:27   #6
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i posted 3 pictures of the rib in my album.
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Old 02 January 2017, 23:23   #7
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Yes, trim tabs are common on the 7m boats.

What's the angle of the deck when you are sitting still Vs underway? I remember measuring mine for radar and they were pretty similar but I couldn't give you the number. iPhones have a quick and easy level. Swipe right at the compass.

Jason
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Old 02 January 2017, 23:55   #8
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Boat name: Zodiac Hurricane 733
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Engine: 200hp - Volvo Diesel
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Quote:
Originally Posted by Bigtalljv View Post
Yes, trim tabs are common on the 7m boats.

What's the angle of the deck when you are sitting still Vs underway? I remember measuring mine for radar and they were pretty similar but I couldn't give you the number. iPhones have a quick and easy level. Swipe right at the compass.

Jason

It sits pretty even in he water, it looks great. No part of the tubes even touch the water and there is a good 4 inch space between.

Cant get pictures to attach to my post i have some

I posted a picture in my album of it sitting on the docks, i think it is pretty well balanced.
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Old 03 January 2017, 01:18   #9
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I looked at your album, sweet looking RIB!

Whats your outdrive, single prop? Does it smoke when throttling up?
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Old 03 January 2017, 01:59   #10
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Country: USA
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Boat name: Zodiac Hurricane 733
Make: Zodiac
Length: 7m +
Engine: 200hp - Volvo Diesel
Join Date: Feb 2015
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Quote:
Originally Posted by tworotorturbo View Post
I looked at your album, sweet looking RIB!

Whats your outdrive, single prop? Does it smoke when throttling up?
It is a single prop Volvo Penta 290 Outdrive.

The engine smokes a lot when starting up cold and continues to smoke until its temperature reaches 130 degrees, which i can't get it that warm without running it in the 2000 rpm range. So Its a little embarrassing to smoke everyone out at the harbor, but i really don't care to much... a little smoke can be classy haha. Once the engine is heated up though absolutely no smoke for the rest of the trip, i can even shut her down for a couple hours and it holds its heat and she fires right back up with no smoke what so ever.

Great running engine overall, always starts within 3 revolutions cold in -10 using the GlowPlugs & she sounds like not even one revolution starting up warm.

I have done a lot research and i guess White/Blue smoke at cold startup is very common for the 41-A's.

In the newer 41-B's & 41-D's smoking was apparently corrected by an exaust butterfly valve in the 1990's but the engines do not have Glow Plugs like the 1980's 41A's.

I start my engines in below 0 temperatures in winter and glow plugs are priceless and worth much more then a little smoke at start-up. So i am happy i have the 41-a
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