A weight problem solution for my Corniche

[Nick2]

Re: let\'s apply science

Thanks Chris.

Point taken and Joanne reckons that its just that I am looking for someting else to worry about this afternoon....... but seriously the reassurance gained here has been great and for the time being at least the genny and tank are staying.

Perhaps I just need some more beer on stbd side!

Nick

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[oldgit]

Have you considered leaving your

WALLET up at the pointy end of the boat.Just trying to be helpful of corse.

<hr width=100% size=1>My little Princess/forums/images/icons/laugh.gifthe 33 of course.Shame its not just a bit bigger.

 

[jfm]

Re: let\'s apply science

Hmmm. A bit strange. It's definitely not the genny then! But 6cm is quite a lot. At least the effect of two 65kg people standing on the port side, praps. The genny ought to balance out some of the other stuff you mention. The merc weighs 13kg I think, which isn't much.

A couple of random thoughts:

1. as others mentioned, do heaters, genny etc run off one fuel tank only?

2. is the fuel tank port/stbd connector valve shut? If you leave this valve open, then a slight list causes fuel to run from one tank to the other, then the list increases, then more fuel runs across, then more list, vicious circle.

3. Where are your batteries? These will weigh more than the other kit you mentioned and are heavy enuf to cause a list.

4. I still say dump the gas. Cylinders are heavy (depends on size of course). Get elec hob. Flick genny on when you want to cook or boil kettle. Why take risk the risk of heavy-than-air inflammable gas on a boat?

5. Where are joanne's tiaras and rings located?

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[oldsaltoz]

G'day Nick2,

For not much more than the cost of relocating just everything on board, you could possibly carry out a minor modification that will solve the problem of a low waterline at the stern and high bow under power.

I'm not sure what you call them in the UK, but put simply, it's an extension of the transom that replaces the duck board and extends to the bottom of the hull, you can control the amount of lift required by extending it's length. Most are built to finish about 300 mm above the water at rest.

The end result is a more buoyancy aft, a good boarding platform, improved performance, and economy thru and extended waterline without the weight of superstructure.

Just a thought. . . . . . . .



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[Nick2]

Re: let\'s apply science

Thanks jfm & our freind from down under for further comments and can shed light on some points mentioned.
1.The genny and heater take fuel from stbd tank I think

2.I did discover that the fuel connector valve was putting too much fuel into port tank but now sorted I think and tanks level.

3.Batteries are on port side of boat in line with list and there are three big ones there

4.2x gas bottles also on port side so will look into your suggestion of dumping gas altogether. Will take them out and see what happens.

5.Joanne only tends to bring small amount of formal jewelery to boat so the tiara unlikely to be a major factor although the shoes are likely to be more of a problem than combined batteries/full holding tank/genny etc etc...........

Thanks again for your help here and I am determined to get to the bottom of it all before commiting to major surgury.

Nick

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[Deleted User YDKXO]

Surely, what matters more is what trim the boat adopts at speed. It should be somewhere between 5 deg and 8 deg. I dont know how the MBY boat testers measure it but with a spirit level and a bit of geometry you should be able to calculate a rough figure
You may not use them much but a genny and a holding tank are very desirable extras on any boat and well worth keeping

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[Nick2]

According to eye witness reports she seems to adopt a pretty normal slightly bows up Corniche trim but will apply a more scientific approach and report back .

Interestingly as B1 has said if there were anything seriously amis Phil Cool and Clive would certainly have spotted it during our trip from Thames to Hythe earlier this year.

Oh well Im off soon to make full use of genny and tank....


Thanks

Nick



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[ari]

Can't comment on how the boat sits when stationary, but can say for a fact that Corniches plane very nose up, to the extent whereby at the lower helm you have to virually stand on tip toe to see over the nose.

I think that Fairline did a magnificent job of getting a load of space in this boat, but as a result it is rather "full" in the bow, which I think is what gives rise to the "bow up" running angle.

The "old shape" forward sloping arch Targa 33's are similar in this respect.

Ari.

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[Deleted User YDKXO]

I agree with ari. A friend of mine had a Corniche with TAMD41 engines and it always seemed to plane a bit bow up to me and he didnt have a genny or holding tank. Nice boat though and a lot of accomodation for the length

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[hlb]

Well, this is my angle. Whats yours??

<hr width=100% size=1> <font color=blue>It's flog a flag day.<font color=red> Today.<font color=blue>

Haydn

 

[Deleted User YDKXO]

Straight as a ramrod, thank you very much

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[Chris_d]

Nick, i'm sure MBM did a short bit on this problem with Corniches a couple of years ago. They stated that it was normal for some Corniches to list to port when at rest, this is because its built that way with the galley, inside helm etc.. heavier than the other side. No problem when planing because of hydrodynamic lift, they said only cure was ballast but not really neccesary. Probaby worth doing a search through some back issues.

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[hlb]

Sounds a bit of a duff way to build a boat, with a permenant list!!

<hr width=100% size=1> <font color=blue>It's flog a flag day.<font color=red> Today.<font color=blue>

Haydn

 

[mike_kolling]

Nick

The biggest weight problem is sticking 200hp diesels in a 31 foot boat.

Yes, it will fly, but all those engines and fuel are in the back and you cannot alter that.

The gennie is a red herring, although if you want shot, I'll give you a fiver for it?

Mike

PS Now at Chatham and brown as a berry!

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[Nick2]

Thanks Chris and all who have been so helpful on this post.

I think that the MBM theory is correct which is slightly exaggerated by genny/tank/outboard/dinghy/jewelry etc and had a good look at her today and conclude that it is not too bad a list and only noticable if you compare the two lower stripes. She planes well now although with the typical bow up trim as mentioned here and I have been able to throttle down to 3000rpm at 15/16 knts and remain on plane.

As ever all you good folk of the forum have reassured me about my boat and I shall continue to enjoy her with tank and genny..... just wont let it get so full this time!

Thanks

Nick

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[tcm]

Fuekl tank balancing - beware?

We talked about this before - there's a tendency to open the connection between two tanks to "balance" the tanks. But of course the reverse is tru. To balance the boat, close the valve and fill the uphill tank. Then it won't be able to run into the other - opening the valve doesn't corrrect the unbalance - it either exacerbates or pperhaps even causes it.

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[Nick2]

Re: Fuekl tank balancing - beware?

Funnily enough we did that last weekend as I did find a valve open when it should have been shut so should at least help as one tank was of course emptying ahead of the other.

Will monitor and report back but so far she feels better already.

Thanks

Nick

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