How far can I go?

steve the farmer

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25 May 2017
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Hi Guys,

Well its been a year since I joined ybw, and it was all with the intention to learn and take note of tips and advice about motor boating in general with a view to buying my first boat. So we’ve not rushed into it and so far the forum has been very useful, thanks.
As a scuba diver, boating is not new to me but the ownership part of it is.

In May last year my idea was to look for something that was multi use, offshore for scuba, coastal and river family cruising, and towable for multi location launching.

But 12 months down the road I cannot find a craft that is good for all scenarios. Anything that falls within 3500kg gross for towing (UK) according to my wife, is too small for 2 adults and 2 children for more than day excursions.

So, we have been looking at a bit bigger craft, accepting it will have to be moored, my family are more important than the scuba. Although the mooring I have in mind does give me a lot of dive site possibilities anyway.
We have now found a 1990 Sealine 285 Ambassador with 3800kg displacement with 2 Volvo Penta AQ205A petrol engines. Both engines have had little to no use since fitting, they were not refurbished lumps but fitted new out the box in 2012, in fact they still look brand new, and sound beautiful. The boat has just been out of the water, engines and legs serviced, antifouled and two new duo props fitted. All gauges, radar, lights etc work as they should.
So I think this is the one for us.

But I have a question? Range! With a fuel tank capacity of 243 ltr how far would I expect I could travel in miles with two 205hp engines. I don’t mean at full throttle, I mean a sensible cruising speed? This is a bit like asking how long is this bit of string, but I just want an idea. If I am say in Herne Bay Kent and want to travel across the Thames estuary over to Essex and up the East coast how far will I get realistically without refueling for example?

Thanks Steve.
 
Hi and welcome to the forum. Full tank of 53gallons, sorry but you won't cruise far on that. It's usual practice to leave a third as reserve in case of getting caught out with bad weather or adverse tides, so say 35 gallons range plus emergency reserve. You really need to know what your fuel consumtion is. At say 2mpg (1mpg per engine at displacement speed) you have a range of 17 miles.
 
Hi and welcome to the forum. Full tank of 53gallons, sorry but you won't cruise far on that. It's usual practice to leave a third as reserve in case of getting caught out with bad weather or adverse tides, so say 35 gallons range plus emergency reserve. You really need to know what your fuel consumtion is. At say 2mpg (1mpg per engine at displacement speed) you have a range of 17 miles.

You mean 70 miles not 17.
 
Hi and welcome to the forum. Full tank of 53gallons, sorry but you won't cruise far on that. It's usual practice to leave a third as reserve in case of getting caught out with bad weather or adverse tides, so say 35 gallons range plus emergency reserve. You really need to know what your fuel consumtion is. At say 2mpg (1mpg per engine at displacement speed) you have a range of 17 miles.

I was not expecting a lot, but I just needed to get an idea before I commit as I can carry on and look for a different hull with diesels. Thank you.
 
I was not expecting a lot, but I just needed to get an idea before I commit as I can carry on and look for a different hull with diesels. Thank you.

I'm not sure that diesel will be significantly cheaper to run than petrol - when's all said and done, pushing a moderate sized boat through the water is an energy intensive job.
 
I have not bought the boat yet, but I am close to doing so. Therefore cannot do any test runs to see what fuel consumption is.
It is possibly a typo on the brokerage details, it has two tanks and it says "total of 243 ltr fuel" but maybe it should say per tank making it 486L capacity. Even so, I was wondering about buying petrol when on the water, as you say, derv is everywhere. I do not really fancy putting 98x5L fuel cans in the car and filling at a petrol station, LOL.
 
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Petrol. Didn’t clock that. DONT DO IT !

Thank you for that input, but for my education, can you elaborate? Petrol/derv at the pumps is similar price, but I don't have clue yet what they are on a pontoon/dock/wharf. Will I burn more petrol than derv with similar HP engine at same rpm and conditions?
 
You will burn at least 30-40% more petrol than diesel for a given boat size. Not a disaster in itself, except you will also pay a lot more for petrol than diesel on the dockside, probably 30% more. So running costs are much higher. So much harder to sell a petrol boat than diesel if over about 25’ length. Petrol better in many respects on the smaller boats, not a boat like you are look8ng at.
 
Well thanks for all this info guys. On reflection I will keep looking for a 30 footer on diesel. I am not going to be water skiing so a slower diesel will probably get more use. I would hate to have a lovely boat and be sitting on a pontoon because I have no money for fuel. :)
 
+1 for diesel, cheaper per litre, you'll use less of it and more readily available waterside

Boat will cost more to buy, servicing will cost a little more but for me, diesel every time

Boat f that size I'd probably be looking for a single engine on a leg or if you want to stay slow a single diesel displacement boat

One engine = 1/2 the servicing cost, especially if on a leg

Me, I'd be looking for a 28 footer, single diesel

Good luck
 
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