Inboard fuel tank?

[BOAT]

Yeah, I know all the power boats have them - I hate power boats - they are stinky. I'm sure there is a way to do the gasoline in the cabin without blowing up the boat but on all the power boats I have been on they all have blowers and stuff. I guess you will be installing blowers? Or is that only for engine compartments? (I don't know about power boats and really don't care). I was on a powerboat that blew up once. It was very scary and I jumped overboard along with everyone else including the captain. My friend Paul who was also a guest on board with me did not jump overboard - he steered the boat to a dock and threw a line to a patrolman that was on the dock with a fire extinguisher and my friend Paul and the harbor patrolman put out the fire - they were not even afraid.

I was hiding behind a dock box the whole time.

After the fire was out I kept ranting about how brave Paul was and how he saved the boat and the law of the sea is that he is now the owner of the boat he saved because the captain jumped overboard - the skipper was not real happy about me saying that over and over again.

Gas is really dangerous - it explodes.

[yukonbob]

With the two 12's and a couple of 6.6g jerrys we get about a 120nm range at <a href="tel:3000-3500">3000-3500</a> rpm

So that's 36 gallons for 120 miles equals 3 miles per gallon, have I got that right? Is that normal? I was getting a little more at WOT.

I thought the cruising MPG for the MAC was 4 to 5 MPG?

Someone check my numbers - I must be wrong
Is this wrong?:

RANGE UNDER POWER
Max range, low speed 283 miles at 6 mph
Max range, cruise 115 miles at 16 mph
Max range, full speed 84 miles at 21 mph


MILES PER GALLON
Miles per gallon at low speed 11.8 mpg at 6 mph
Miles per gallon at cruise 4.8 mpg at 16 mph
Miles per gallon at full speed 3.5 mpg at 21 mph


FUEL USE
Fuel flow at low speed:Gallons per hour .5 gallons at 6 mph
Fuel flow at cruise:Gallons per hour 3.2 gallons at 16 mph
Fuel flow at high speed:Gallons per hour 6.0 gallons at 21 mph

Which Mac? My range and gas consumption is real world conditions (wind, ballast in tides/currents loaded for month etc) and I usually have 4-5 gallon reserve and measure in nm not miles. Starting with two full tanks and two full jerrys I pull into harbour with a little to spare.

[BOAT]

Yeah, I can only speak for 'boat' bob - I really do not know how the other boats use fuel. I am in salt water - fairly warm salt water - in an almost empty boat with no bottom paint and a clean spotless hull. The prop is very shallow and the bow rides nice and low at full throttle. With ballast tank empty there is no spray in the cockpit and I have a cover over the main. The boat goes pretty fast and rides pretty high on the water at that speed. I use about 6 gallons every hour I am running like that.

[Mac26Mpaul]

Hi Kadet,

Yeah, I am also inspired by Simon. Actually I'm the one that told him to start using google maps in his vids ( to help me with future planning ) and told him where to get the music he is using now.

I'd love to do Brisbane to Whitsundays in the Mac and we know it is entirely capable of it, but could get pretty uncomfortable... My wife and son get seasick very easily. A few weeks ago we planned to do some whale watching and went out of the Gold Coast. Hard to see on camera of course, but there is a 1.2 meter swell running out there in this vid, and of course we had to turn around before finding the whales due to my son being sick.. (yeah, I forgot the seasick tablets).
https://www.youtube.com/watch?v=d-h-KQu0XmM
Must be 600 nautical miles to the Whitsundays, not sure my family would be too happy in swell for days on end A special boat wife is a wonderful idea

If you start doing these trips, I sure hope you consider video logging and sharing them A nice Brisbane to Whitsundays ocean trip would really stick it to the bashers that amazingly still seem to be out there.. And would give fellow Mac owners some REAL inspiration!

As to 4 x 22s, well I already had 2 x 22s so its only another 44kgs, which is about the same as having another child in the cockpit. We use the stern berth for storage and there is a bunch of junk down there as well including a 20kg inflatable. Fully loaded, with all that junk, the boat does sit slightly lower at the back but not enough for me to consider changing the way I store stuff. If I got all the heavy junk under the V berth, I'm sure I could even it out.

I'm with Boat and wouldn't want a big fuel tank in the cabin, although I do store my generator under the table which has 2 litres of fuel in it, but can't smell fuel or anything from it.

WIth the 4 x 22s, I bought some plastic buckle things from Whitties which you can see below, although not installed in the picture. they don't move and it all works perfectly. I also bought those cheap brass connectors at Whitties. Somebody else mentioned getting air bubbles in them. I have not had that problem. They work fine. The tanks are made in Italy from memory - the fuel gauges on them are a bit of a joke, but I don't even look at them, just give the tank a rattle if need be to see how much juice is in it.

[Mac26Mpaul]

So on the Brisbane to Fraser Island trip, I guess you are factoring in, being ready to go the long way, right up the top of the Island and around, rather than through the Wide Bay bar. I don't have any experience with that bar but heard it can be pretty much a no go zone for days on end. In fact Simon bypassed it and went the long way in last years trip I think. Or is that the plan to go up and around into Hervey Bay?

[BOAT]

I really LIKE those little fuel tanks!! I want two of those RIGHT NOW! Where can I get THAT!?



I think that is a super cool way to store gas! Cuz I can grab one of those and easily run to a fuel dock or get it into a dingy! Hey, I bet one of those would even float well enough for me to swim to shore to get some gas!

I think those little tanks are a great idea - I am going to leave one of the big twelve gallon ones in 'boat' but I think on the starboard side I am going to pull out the big 12 gallon and put two of those little ones just like paul has - I think that's really nice and very convenient.

[Seapup]

I am steering towards 1 mainly because as I am concerned about the weight high in the rear making the less stable in a following sea.

I know an internal tank is possible, I am not concerned about the hook up or danger just is it necessary is the weight saving high in the cockpit important or does moving the weight lower in the back really not make that big a difference?

I have the X, But have not found aft weight to make it squirely in a following sea. My old motor was over 300lbs heavier and I carried an additional 12 gallons on deck behind the seat with it so 400+ lbs deck level compared to what I have now. I have had the bow bury itself with following seas and too much weight forward.

The bow displacement is tiny, aft huge, my experience is weight up front is good for normal sailing, but changes the balance at least 4x faster than weight aft.

We almost always have 80lbs of kayaks on the roof, I was greatly concerned about this at first and over time discovered its not even noticeable from a stability standpoint.

If only for trips your original idea of jerry cans seems decent. The offroad racing ventless cans are much thicker than standard cans and can flip over without leaking. Easy to carry, fill & move around, leave them at home when you don't need them.

Having the cockpit lockers empty for normal trips is nice...

I think I read some people cover the small footwell in front of the pedestal on the M and put fuel cans/tanks there on trips.

So that's 36 gallons for 120 miles equals 3 miles per gallon, have I got that right? Is that normal? I was getting a little more at WOT.

I thought the cruising MPG for the MAC was 4 to 5 MPG?

Someone check my numbers - I must be wrong
Is this wrong?:

RANGE UNDER POWER
Max range, low speed 283 miles at 6 mph
Max range, cruise 115 miles at 16 mph
Max range, full speed 84 miles at 21 mph


MILES PER GALLON
Miles per gallon at low speed 11.8 mpg at 6 mph
Miles per gallon at cruise 4.8 mpg at 16 mph
Miles per gallon at full speed 3.5 mpg at 21 mph


FUEL USE
Fuel flow at low speed:Gallons per hour .5 gallons at 6 mph
Fuel flow at cruise:Gallons per hour 3.2 gallons at 16 mph
Fuel flow at high speed:Gallons per hour 6.0 gallons at 21 mph

Its on the internet, has to be true I love that silky smooth 16mph half throttle cruise

Ya have that etec plummed into that NAMA network thingy for monitoring basic fuel rate and watering the lawn by now don't you

[kadet]

So on the Brisbane to Fraser Island trip, I guess you are factoring in, being ready to go the long way, right up the top of the Island and around, rather than through the Wide Bay bar. I don't have any experience with that bar but heard it can be pretty much a no go zone for days on end. In fact Simon bypassed it and went the long way in last years trip I think. Or is that the plan to go up and around into Hervey Bay?

Plan is to go inside over the bar. I am the boss where I work so I can take my holidays when I like so I will just wait for a decent weather window before I leave then just go at a moments notice . I will do the bar in power boat mode which is why I was worried about the following sea making the backed squirrelly. I have crossed the Nudgee bar in 1 metre chop and that was not much fun. If all else fails I have friends near Tin Can bay so will use the trailer to bypass the bar and just drive up

I will take the gopro so some video may find it's way onto the Web.

Thanks for the pics of the Hulks, I did a search on your old posts and found them they look perfect.

Decision made 4x22L hulks it is.

Thanks everyone for your input especially Seapup I know the is flatter or fatter in the Ass but I will risk the performing the same.

[kadet]

I really LIKE those little fuel tanks!! I want two of those RIGHT NOW! Where can I get THAT!?

A quick search of the net only found them here and in Europe looks like you might have to sail over here Boat

If you leave now should only take you 4-6 months, It's almost a straight line with only New Caledonia in the way

[Wayne nicol]

this is a mod that i have been seriously considering.
and i have found a tanl by moeller that will fit under the boards in the stern- 24 gallons- spoke to coast guard here- and for commercial use- i would need to "compartmentalize" it that would be easy with some glass work, then they need an air inflow and an air out flow- that are outboard- also very easy with some simple plumbing- no pumps etc
seems an easy enough mod- then i can open up more space in the cockpit- the weight is lower, and i can still use the fuel lockers for fuel tanks for the long trips!

an alloy tank was about $1000- the plastic was about $300

[kmclemore]

this is a mod that i have been seriously considering.
and i have found a tanl by moeller that will fit under the boards in the stern- 24 gallons- spoke to coast guard here- and for commercial use- i would need to "compartmentalize" it that would be easy with some glass work, then they need an air inflow and an air out flow- that are outboard- also very easy with some simple plumbing- no pumps etc
seems an easy enough mod- then i can open up more space in the cockpit- the weight is lower, and i can still use the fuel lockers for fuel tanks for the long trips!

an alloy tank was about $1000- the plastic was about $300

It is indeed a very easy mod, Wayne... check the photos of mine (see my link earlier in this thread). I used a plastic Moeller 18-gallon tank - they are lighter and just as durable given this is a locked-down installation. Make sure you buy the tank brackets that fit the tank and secure it firmly to the aft cabin sole. Mine is vented via vents in the binnacle and the transom. A compartment was made of wood and panel board, completely sealed with sealer on all joints (not necessary to use fiberglass). Plumbing comes up in the transom engine well and goes right to the motor. Fill located directly above the tank and uses a Perko filler with return vent, right off the shelf. I've never once smelled even a whiff of gasoline smell in the cabin... completely fume-free.

[Signaleer]

I am in the process of preping the for some long haul live-aboard adventures. One of the mods I am considering is fitting some longer range fuel tanks.

Option 1 the one I am considering is to fit a custom alloy tank 100L (25 Gallon) inboard under the rear berth.
Option 2 is to fit 4x22L (6 Gallon) tanks in the cockpit, the one I'll go with if not the inboard.
Option 3 is to fit 2x45L (12 Gallon) tanks in the cockpit, only if I cannot get 22s that will fit 4, my current 22s only fit 2 in the available cockpit space.

Any other suggestion welcome.

Thanks

I have 2 X 17 gallons stainless steel tanks port and starboard. Carry 34 gallons of fuel. With ballast in and 2 people can hit 19 to 20 mph @ about 2 to 2.5 miles / gallon at wot.

I have a 2 stroke 90 hp.

Ed.

[Highlander]

Here,s the fuel tanks I have they r 6 1/2 Gal tanks each
http://i844.photobucket.com/albums/ab1/ ... 010036.jpg

http://i844.photobucket.com/albums/ab1/ ... 0009-1.jpg

http://i844.photobucket.com/albums/ab1/ ... 010041.jpg

http://i844.photobucket.com/albums/ab1/ ... 010042.jpg

http://i844.photobucket.com/albums/ab1/ ... 0004-2.jpg

http://i844.photobucket.com/albums/ab1/ ... 010033.jpg

J

[BOAT]

Here,s the fuel tanks I have they r 6 1/2 Gal tanks each
http://i844.photobucket.com/albums/ab1/ ... 010036.jpg

http://i844.photobucket.com/albums/ab1/ ... 0009-1.jpg

http://i844.photobucket.com/albums/ab1/ ... 010041.jpg

http://i844.photobucket.com/albums/ab1/ ... 010042.jpg

http://i844.photobucket.com/albums/ab1/ ... 0004-2.jpg

http://i844.photobucket.com/albums/ab1/ ... 010033.jpg

J

Hey!



You moved your tach to under the wheel too?

[beene]

You moved your tach to under the wheel too?

Who needs a tach anyway

Not me

I took mine out years ago

With my eng,
6-7 mph engine barley running, fuel econ, insane
16-18mph cruise on top, engine not working too hard, fuel econ not so great, not so bad
22mph++ WOT, only trying to make a point against a nay saying stink potter who wants to race me fuel econ, non existent!

G