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Old 27 April 2009, 16:21   #11
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Quote:
Originally Posted by wavelength View Post
and steer clear of the underfloor tank option.
It refers to this one
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Old 28 April 2009, 12:48   #12
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I have a 5.5 destroyer with a 115 Etec. The performance is excellent and it goes like stink. The economy running at about 3250 rpm is better my 19ft Orkney with a carbed 50HP hatsu.
I do feel that it is a little stern heavier/bow light though, the E-tec comes in at 173kg which is 3 KGs over the Max weight.I'd like to see what it would be like with an E-tec 90 which is around 45 kgs lighter. If you are thinking of an Opti then go for the 115 as it is the same weight as the 90!

What-ever you choose I'd go for the XL transom as I have heard the standard transom tends to ship a little water when in reverse/at rest in the rough. I have the XL transom with a cutdown on one side for an aux engine. I haven't shipped any water yet!
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Old 29 April 2009, 15:34   #13
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in addition to the underseat 90 litre tank we carry a second 30litre tank between the front consol and the anchor locker of the destroyer to provide a little extra weight in the bow. Improves the balance into a head sea.
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Old 30 April 2009, 17:45   #14
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always gone for an under deck tank when i've had a choice and never any problems (except a leeky gauge easily fixed) seams strange advice, particulary to someone buying brand new??

my opinion is they are bigger (bigger the better), and the CoG is lower.

I could understand prehaps steering clear of 20yr old under deck tanks...but spanking new??
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Old 30 April 2009, 18:03   #15
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always gone for an under deck tank when i've had a choice and never any problems (except a leeky gauge easily fixed) seams strange advice, particulary to someone buying brand new??

my opinion is they are bigger (bigger the better), and the CoG is lower.

I could understand prehaps steering clear of 20yr old under deck tanks...but spanking new??


And they allow you more space on the deck and/or inside the console.
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Old 01 May 2009, 06:42   #16
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I think what Dave was getting at, and we have had discussions on this, is not all the advantages that are mentioned above but the lack of thought that goes into the design of most under deck tanks. Such as, no baffles, no inspection hatch, badly positioned breathers and fillers making filling a slow and messy job, tanks with large surface areas and so shallow that guages are useless and you cannot dip them or fit a sight glass because they are sealed int the hull at build time. I am not saying do not get a RIB with a built in tank, I have one and even though it has some of the above problems, I think the advantages make it worthwhile but it would be so much better if builders designed the tanks into the boat and did not offer them as an after thought. Before I get complaints about slagging builders I am not saying all are bad I have puposely not mentioned any makes just that you will find some of thes design flaws in most.

If I have not put this very well I am sure Dave will be along shortly to correct me.

Keith
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Old 01 May 2009, 12:14   #17
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thats about right Keith. The filling of underfloor tanks fitted by a certain manufacturer do require rather a lot of patience to say the least!
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Old 01 May 2009, 16:15   #18
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Quote:
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thats about right Keith. The filling of underfloor tanks fitted by a certain manufacturer do require rather a lot of patience to say the least!
Agreed. But when it's only needed every 300 miles...
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Old 01 May 2009, 16:33   #19
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Quote:
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badly positioned breathers and fillers making filling a slow and messy job,
My Valiant seems to have this sussed .. easy fill job, but you do have to get used to sound of when its full


Quote:
Originally Posted by kwil View Post
tanks with large surface areas and so shallow that guages are useless and you cannot dip them or fit a sight glass because they are sealed int the hull at build time.
Totally copy that

When you're not used to your new craft if this is the way its rigged .. I do some dummy cruising and run out of fuel whilst carrying some ballast fuel so I can work out the engine consumtion in lph and an 'average total range' regardless of what the fuel guage tells me, so I only use it as a guide, and always know just on my cruising log,. how far I can get TBH I think most peeps should do this, regardless of tank design as I've had some very innacurate guages in the past (including mercury calibrated ones ) and ones where the lift pipe has floated on the fuel in the tank when it wasnt even near empty
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Old 02 May 2009, 05:26   #20
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I have a 5.5m Destroyer with a 90 Opti on the back. I am totally happy with it. Yes you can have all the gizmos on others but this does what it says on the tin! Goes like the wind, holds all seas and is stable for fishing and great fun towing. Yes get the consul tank it is soooo easy to fill. Good luck
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