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Old 19 April 2003, 07:42   #11
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Quote:
Originally posted by Jon Fuller
... if for some reason one of the feeds is a little easier to draw from than the other (which it probably is), this side will empty first and begin to draw air, whilst the other side would still contain fuel, would it not!
You are right that when one side of the straddle is empty it would draw air but this isn't a problem because there are taps at the end of each of the pipes where they feed into the common engine supply pipe. I simply close the tap that relates to the empty side and open the tap that gives access to the reserve. Of the 3 taps 2 are always closed.

OK?
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Old 19 April 2003, 07:50   #12
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Ok Mike
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Old 19 April 2003, 15:00   #13
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Mike, so how does your fuel return work? and how long does it take to bleed your fuel system when you realise too late and it's drawn air?
This is not criticism, I'm just interested!
When I've rigged multi tank setups that reqiure only one feed, I've run all tanks into a manifold which is lower than all the tanks, an outlet from this feeds the engine, the return runs to the highest tank although it could probably run to any one of them as the manifold would allow them to ballance the small volume involved with the return system.
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Old 19 April 2003, 15:03   #14
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Mike, thanks, I do follow. My original thoughts were to fit 3 tanks. Only the rear one was to have a filler and the the front tank would vent, via a high part, to the middle one and that vent similarly into the rear one. On filling, the fuel would be pumped from the rear forward to whichever tank required it. The pumps are reversible so fuel could be moved about to trim the boat if necessary. Unless all the tanks are fairly full, of course. Each tank would have a feed and return. These could be selected manually, using 2 off 3 in, 1 out cocks, or selected via solenoid valves. The filling was to be done, as you had suggested, within the engine compartment using a catch funnel to feed any spillage into the filler pipe. However, I'm fairly certain, at rest, the forward tank vent will be higher than the top of the rear tank and it wont fill fully. Likewise the centre tank. The whole system could be turned around and filled from the front but I'd loose the benefit, which you confirmed, of having the fumey/greasey end out of the way. But, you've given me food for thought. Ta.

Did Mrs. G tap you for a new pair of shoes?


CH, the boat is already cat B, but I think DD was winding you up! You gotta keep your eye on him!

OK DD and JF, you've got a new boat. Tell me how you would fuel it.

JW.
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Old 19 April 2003, 15:24   #15
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JW,
How many motors, how many tanks? is it a rib or a real one LOL
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Old 19 April 2003, 15:32   #16
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JF, One motor, 3 tanks and it's a real rib one.

No, lets start from scratch. One inboard diesel motor in a real RIB. How would you do it and why?

JW.
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Old 19 April 2003, 15:36   #17
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On Diggis RCD Quote JW .

I dont believe it is a wind up as I am of the oppinion that there is a lot more to this,than maybe you all realise.

But I shall leave all this tank stuff to the experts,But one little point worth mentioning here is The Hull if it has a rcd cat B Ce mark as is for the hull only, with there own configuration of engine,Tanks,weights ect. fine for them, and a boat purchased from them, but maybe not you as you have a hull only.

This could of been passed with in a outboard configuration or there with there own specified designated inboard, and built to there own spec ,that would of then been put through the tests To show conformaty to RCD cat B compliance.

Unfortunatly this makes doing your own fit out none complient unless it passes the exact same tests as the ones your hull manufacturer homologated for CE marking approval.The cost for the tests are in the region of 2000.There are no credits if a boat fails.

If you check with Them I think they may confirm this, as they are not fitting the boat out themselves,therefore they have no claims Re RCD stability and fit out regs, As you are doing this yourself,and with no disrespect we can all make mistakes.

Good luck with it JW and if you eventually you want any RCD stuff that will give you maybe a chance of complying then feel free to say so.

As you know I am not winging it, as my costs/risks are to high to maybe end up with a offshore rib, that maybe one day I cant go offshore in becouse of maybe a future insurance companys unrealistic demands.
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Old 19 April 2003, 15:52   #18
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JW,
as this is a test, I must have the rules laid out to avoid argument.
what style of rib are we talking, ie cabin, open, etc, and are the tanks to be underfloor?, wing, in line, ?
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Old 19 April 2003, 16:00   #19
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This is going to be fun
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Old 19 April 2003, 16:11   #20
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JF, no test, just picking you brains. But, I'll grade you out of 10 if you would like.

Open 8.5mtr rib, large consol two seats behind the consol and bench seat on front top of engine box. There's a bit of extra height to play with - the floor area between the engine box and the console is to be raised about 150mm. All wiring etc. from motor to consol is to pass through there. The breather pipe(s) could too if necessary. Anchor locker in the bow and storage lockers also at the bow, at each side. So a bit of weight up front.
Tanks to be underfloor. Will be moulded using NPG resin so can be as complex as need be.
Preference is to lift as little of the deck as possible to insert them.

Phew. Is that enough?

JW.
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