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Old 01 June 2011, 16:55   #1
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Shifting Batteries

Since putting my Osprey on the water I have been less than happy with the handling. It is difficult to put into words, but the clean, straight running of other Ospreys was simply missing. The obvious factor was that the boat listed to port when up and running, but the subjective impressions went further than that, it felt dull, wrong, and to be frank I have got to the stage where I just cannot put up with it any longer.
So, what to do about it Sell the boat? No, there must be a reason for it.
If you are in the boat building line please look away now
I know that when building the boat I had put the batteries in the wrong place My thinking was that I would often be running one up and so to trim the boat I'll put the batteries on the other side thinks I. Wrong
Everyone puts the batteries on the starboard side to counter prop torque. But many that I spoke to said that they could not see this being the whole issue, even a heavy house battery weighs a lot less than one passenger. But I have got to do something, so I'll start by putting the batteries in the right place
When I first built the boat I constructed a massively over engineered 'monster' to mount both the starter and house batteries and oil tank in the bottom of the console. This is in picture 1. So as you can see in picture 2, taken looking back from the bow, the console was quite full, but crucially, the weight of the batteries is over the port side. When I fitted the monster I screwed and Sikaflexed it into place - mistake number 2 If you look closely in picture 3 you can see what I thought would allow me to get the monster out if I ever needed to - cheesewires, as recommended on this very forum. These are OK if you can get a straight pull, but...............I think a suitable moral is if you fit something that you think will need to come out at any time DO NOT use Sikaflex
Pictures 4 and 5 show verious stages of removal of the monster, taking three days in all using a combination of Fein Multimaster (brilliant), and hammer and chisel. What a job The lump hammer that you can see was not used, but I was re-assured to have it to hand
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Old 01 June 2011, 17:09   #2
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Country: UK - England
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There's More............

So now I have finally cleared the bottom of the console, but as you can see in pic 1 it was not without a little cosmetic damage. So repairs and a lovely new topcoat, pic 2, and I am back to where I was 3 or 4 years ago.
I have decided to build some Gucci new battery trays, which will have a nice foam lining to give my darling battteries the comfort they so richly deserve You can see these liners in pic 3. 4 shows stages in the construction of the trays, around the foam liners, and 5 a completed tray - not perfect, but heck it's a battery tray, destined to live in the bottom of my console
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Old 01 June 2011, 17:18   #3
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And Now........

Picture 1 - the heaviest (house) battery tray is mounted over the top over the under-deck trunking outlet.
Picture 2 - the house battery just fits.
Picture 3 - the second (starter) battery tray goes in
Picture 4 - and the starter battery goes in.
The oil tank is now mounted just to port of the starter battery. So I have kept the weight to the starboard side of the boat as much as possible.
Now I just need to add some water................
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Old 01 June 2011, 17:52   #4
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What Offset did you give the engine and from the rear is the offset to port or starboard?
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Old 01 June 2011, 18:01   #5
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Offset

Chris, my transom has sometimes resembled graph paper with all the lines pencilled on it at various times checking and re-checking the offset. The upshot is that it is an inch and a half offset from the centre line to starboard. I have even checked that the engine is perfectly vertical - it is
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Old 01 June 2011, 18:09   #6
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Chris, my transom has sometimes resembled graph paper with all the lines pencilled on it at various times checking and re-checking the offset. The upshot is that it is an inch and a half offset from the centre line to starboard. I have even checked that the engine is perfectly vertical - it is
Thats fine then.

I think you are on the right track with the batteries. Just keep in mind that adding weight regardless of which side is not going to improve handling so anything you can do to lighten the load and regain the balance is going to make a difference.

I only had one battery in TB and although I agree having 2 is a nice to have I decided that one battery and a starting pack for emergencies kept it simple and light weight and in nearly three years I never had battery issues.

Looking at your construction methods and knowing that you spent a lot of time attending to the fit out is there a chance you have added lots of weight in other areas as well?
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Old 02 June 2011, 01:12   #7
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What Offset did you give the engine and from the rear is the offset to port or starboard?
Does port or starboard change then? if looking from the bow or stern ?

Jim
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Old 02 June 2011, 02:20   #8
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Looking at your construction methods and knowing that you spent a lot of time attending to the fit out is there a chance you have added lots of weight in other areas as well?
My construction methods I don't know what you mean
There is probably a little more weight in the console structure than other similar units, but not massively so.
I have taken a reasonable amount of weight out by removal of the monster battery holder, and replaced it by relatively low weight items.
The only other structure of note is a substantial 2" A frame mounted well to the stern, the sternmost tubes fitting to the outside of the transom, but I think that this is offset by a relatively low weight engine.
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Old 02 June 2011, 03:29   #9
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I think you need a heavier engine (Cue Gotchiguy )

Incidentally, my Osprey also runs with a slight but noticeable list to port, and when it dries out it always falls to port even though the engine is offset to starboard. My battery is mounted on the port side, but I really can't see 20kg or so making that much difference. It's the same when using singlehanded and I'm pretty sure I'd be counterbalancing the weight of the battery 3 or 4 times over.

I wonder if Mike lays up the port side slightly thicker or his template for the fuel tank mounting position is slightly worn?
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Old 02 June 2011, 04:19   #10
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I think you need a heavier engine (Cue Gotchiguy )
Hello!
Quote:
Originally Posted by Erin View Post
Incidentally, my Osprey also runs with a slight but noticeable list to port, and when it dries out it always falls to port even though the engine is offset to starboard. My battery is mounted on the port side, but I really can't see 20kg or so making that much difference. It's the same when using singlehanded and I'm pretty sure I'd be counterbalancing the weight of the battery 3 or 4 times over.
It depends on the weather. In some seas, it is going to be the prop of the prop which will send you to starboard. At other times, the boat does seem to have a bit of a tendency to fall a bit to port underway. This is especially noticeable when I drive with GD next to me, the best way to conteract it is to have one stage of tab more on the port side, thereby lifting the stern and levelling it out. It is surprisingly effective. Our engine is offset 1.5inch to STBD and the battery is on the STBD side. When GD helms it is far less noticeable.
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