Come clean on fuel consumption

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gallons..? goodness me; I ll need to ask my grandfather what that is.

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It was somthing that was used when Britain used to be Great! Litres came in when gallons got to expensive, this was done to confuse us all, so we did not know how much a gallon of fuel had gone up.
 
Great response....thanks.
I wanted to resolve a discussion about whether plugging along at 6knts in a sailing hull which is designed for that sortof speed is more or less efficient than going at say 20knts in a motorboat where the hull( and the superstructure ) is specifically designed for that speed range.
I think the answer is that there is less of a difference than I thought there might be!!
 
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My Mustang with Cummins qsc8.3 540 hp will do

A 2120rpm cruise at 18.6kts will consume 60lt/h per engine. A 2200rpm fast cruise at 23kts will consume 63.5lt/h per engine, while a 2670rpm top speed of 29.9kts will consume 105lt/h per engine.

A 600rpm cruise at 4.3 knots will consume 2.5lt/h per engine.
A 1000rpm cruise at 7.8 knots will consume 10lt/h per engine.

So you can burn loads and get some where very quick or cruise like a sailing boat in the direction you want to go for very little?

Tom

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Any ill-effects from cruising at 600rpm? My CATs would glaze.
 
Fuel ( proper unleaded stuff! ) comes in £140 lumps. Lumps are purchased at about 3 wekly intervals ( if the weather is not tooooo bad.) This works out at more than one smile per £.

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I looked at returning to sail earlier in the year and the true costs per mile are surprising.

Most Mobo owners are working hard to afford their pleasure and are limited to weekend use and can not afford to be stuck 12 miles off shore with the tide against them making 1.5 NM over the ground.

As such the average miles per year under sail would be 250 nm

Under power the average is easily 1500 nm £3500 diesel next year ouch

BUT

Sail boat 43 ft costs £7000 per year to berth

Motor boat 36ft has the same accommodation cost £5000 to berth


Sail £7000 divide by 250 nm = £28 per mile

Power £8500 divide by 1500 nm = £ 5.66 per nm


That does not include any cost for sails which are by no means free and the average mobo owner would have to go out in GF 5-6 as those are the weekends he gets away from the office, using sails in those conditions will easily cost £1 mile in wear/tear/repairs

Sail looks a cheaper alternative but it isn't when you look at it properly.
Sail can be cheap if you are retired and can swing, wait for tides, cils, channel depth and wait storm bound at anchor but none of this works for the type of person who owns a mobo.......speed is vital

Example

Leave work Friday 1700 hrs
M3 100 mph
Make the cil by 1830 hrs for a 3 hour weather window to
the Chanel Islands at 25 knts
Back on Sunday night up the M3
Its only a few weekends a year but there is nothing like it
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And there's the rub, you've justified it in terms of cost/mile.

But sailors don't think that way, it's not necessarily about the destination but the journey, and the pure pleasure of being afloat.

If you reworked the figures into cost/hour spent on the boat (not necessarily moving, but just time spent on the boat) I rather suspect the boot would be on the other foot.

Oh, and a 5/6 in a 43 foot yacht is not uncomfortable like it is in a 36 foot MOBO, it's fun! (nor is a 5/6 a gale)
 
I'l take the bait /forums/images/graemlins/smile.gif

This one could take ages .......

That was part of what I was saying, there are many hours spent on a yacht waiting for the tide to come in, waiting for the tide to change.

Waiting for a container ship to pass ( ahem, only joking)
Waiting for a 12 hour window to clear the channel and lets be honest you really need a spare 10 hours after to be sure before you take the family.
Hard working MOBO owners just don't have that sort of time to spare.


Now the bit about Yachts are happy and comfortable in 5-6, maybe in sheltered waters but my experience has taught me other wise

When I have been out in GF 5-6 (5-6 offshore feels like GF in small boats) as I get to port it is full of sail boats with cloths/sleeping bags out drying, crews having a good moan about how bad it is .......now think about it, they were on passage, felt it was rough and headed for a safe haven.......it took them 2-3 hours to make the safe haven, that means they were heading for a safe haven as I set off, alright it might have been border line comfort but we would have gone back if it was too bad.
This has happened far too many times , and I have taken many of my old sailing buddies on my boat and know how they can cope with sea state, one coward in the fore-cabin as we left in a GF6, while 8 year old girl held their hand , by the time they realised the boat was able to cope with the conditions we were back.

I have been storm bound too many times with sailing boats , we are always the first to leave.

If the sailing boats are so comfortable in all weather ( F1 to GF 7) why dont more wives tag along ?

That is the reason I gave sailing up, I had the choice sail on my own or cruise with my family.
 
Clam down! I'm not questioning how anyone chooses to get afloat!

Just clarifying that the priorities change with different types of craft, and to be honest in all walks of boating it's very hard to justify owning a boat finacially. It's all about what you love.

By the way, just loving your assumption that MOBO owners work harder than sailors! Simply classic!
 
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That is the reason I gave sailing up, I had the choice sail on my own or cruise with my family.

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yep me too!

still love both though. I fancy buying a share in a sailing boat in greece (on holiday so lots of time) and keeping the mobo in the solent (for the channel island weekends)

And you're all talking nonesense, if you try and justify any boat as business plan you'd never get the capex. If you can afford to do what you love doing then just spend the money.
 
You forgot to mention how easy it is to move around the boat at F5-6 when you're 45 degrees tilted to either port or starboard /forums/images/graemlins/grin.gif

I had my first trip on a sailboat couple of weeks ago in 20 knots winds, felt it was quite uncomfortable.
 
I find my best cruising speed is around 2700 RPM, consuming 25 liters per hour per engine doing about 23 knots, which gives roughly over 2 NMPG.

Boat is a 37 ft sportcruiser with 2 x D4-225 HP engines.

On inland motorways, pottering around at 6 knots (1000 RPM) gives about 4.5 NMPG
 
You can not use a simple cost per NM equation.

Some days I sail all day and may only use one litres of diesel when manouvering at the marina. I do not go anywhere in particular I just sail around and clock up some more time on the boat.

Some days we have friends with us, this might be a short sail of an hour and a hlaf to a nice bay, drop the hook have a swim, some lunch aboard and a gentle sail back. Might motor back if I feel like it.

Both are just as enjoyable, what counts is enjoying your time afloat no matter if you are a raggy or a mobo.

Only difference that I can see is that a raggie is more inclined so sail around all day without going anywhere in particular, whereas the mobo will tend to have a destination and get there quickly.

If I had a mobo I would still choose to go to the same bays, but just get there a bit quicker, I would also look at some others slighly further away, but would not be able to justify the fuel costs of just spending a day driving around.

Note: my boat is in the Med so do not have to worry about waiting for tides or checking when high water is. Then again that is the style that I choose, each to their own after all.
 
I was just trying to show that GPH (the original post question) was not the only consideration in economic Hull design.


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By the way, just loving your assumption that MOBO owners work harder than sailors! Simply classic!

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Oh there have been lots more conclusions drawn from behaviour I have witnessed /forums/images/graemlins/wink.gif

By the very nature of the 'sport' patience is practised which starts on Friday afternoon as they drive down the M3, A3 blocking the centre lane at 56 mph, dinghy sailors being just as frugal but add in a few meaningless erratic lane changes to add confusion as they practise ramming their mates into buoys.

then the dash to make the tide/Bar is further hindered as the Pontoons are blocked with drying sails , if they hoisted them and used them the wind would dry them.

But far more worrying is the all male crews that are predominant on the sailing boats. /forums/images/graemlins/ooo.gif

There are of course other sports predominately all male, I used to share a bath with 30 Rugby players which some may find a bit gay but at least we all went home at night to our girlfriends/wives !

Not trying to be none PC, I dont really care, you can do it where you like but just pointing out another difference between the type of person who owns a mobo, more the family man who enjoys the company of his family over the weekend, and perhaps isnt as comfortable as some men to spend a few nights away with other men in confined spaces. /forums/images/graemlins/wink.gif /forums/images/graemlins/wink.gif















You should realise by now that I am not wound up , and the last bit wasn't meant as a serious post /forums/images/graemlins/laugh.gif
 
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I was just trying to show that GPH (the original post question) was not the only consideration in economic Hull design.


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By the way, just loving your assumption that MOBO owners work harder than sailors! Simply classic!

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Oh there have been lots more conclusions drawn from behaviour I have witnessed /forums/images/graemlins/wink.gif

By the very nature of the 'sport' patience is practised which starts on Friday afternoon as they drive down the M3, A3 blocking the centre lane at 56 mph, dinghy sailors being just as frugal but add in a few meaningless erratic lane changes to add confusion as they practise ramming their mates into buoys.

then the dash to make the tide/Bar is further hindered as the Pontoons are blocked with drying sails , if they hoisted them and used them the wind would dry them.

But far more worrying is the all male crews that are predominant on the sailing boats. /forums/images/graemlins/ooo.gif

There are of course other sports predominately all male, I used to share a bath with 30 Rugby players which some may find a bit gay but at least we all went home at night to our girlfriends/wives !

Not trying to be none PC, I dont really care, you can do it where you like but just pointing out another difference between the type of person who owns a mobo, more the family man who enjoys the company of his family over the weekend, and perhaps isnt as comfortable as some men to spend a few nights away with other men in confined spaces. /forums/images/graemlins/wink.gif /forums/images/graemlins/wink.gif















You should realise by now that I am not wound up , and the last bit wasn't meant as a serious post /forums/images/graemlins/laugh.gif

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I'm beginning to think that some sailor made a pass at you once, would explain so much!
 
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