fuel weight

[Far side]

I know this might be a bit anal but I was at the servo filling my fuel containers
The plastic red ones from repco
And the container is supposed to hold 22.7 litres filled the 3 and paid for 73 litres

That got me going

Have a set of digital scales in the workshop started weighing
ULP weighs .7395 kg per litre
container weighs empty 1.841 kg

Weighed the three and it was within 100ml
Remembered the pump and always go back to that one

Now I weigh the three containers to determine accurately how much fuel I am adding and check this against the fuel Consumption

[saurian]

Farside , thanks for the weight of ulp , helps me work out loadings for longer trips.
Ta

[shaman]

Bit Bored Mate ?????

[Far side]

Yes bored Cant take the boat out young fellars birthday have to do the bday things

Weather is looking great
bugger

[Kerry]

Plastic fuel containers have a "nominal" capacity being non rigid material and a max fill line/level limit. Fill right to the cap and you would certainly go over stated capacity.

[-spiro-]

thanks for the weight of the unleaded fuel i thought it was a kilo a litre. so there you go another thing that i learn't today

[Roughasguts]

Spiro, that be water thats 1 Kilogram per litre.

Avgas is 0.71 Kg per litre, interesting the differant weights for each fuel grade.

[Far side]

I wonder if ethanol blended fuel has a different weight

[seatime]

specific gravity is rated as fresh water weighing 1kg per 1lt, ( and 1tonne per 1 cubic metre) and ratio's are to 1, which is fresh water.

super used to be about 1 : 0.74, so unleaded doesn't seem much different.
crude oil (gippsland) is about 1 : 0.94 (arabian, a bit heavier)
Lube oils, diesel, etc will be somewhere in between.

edit. on average saltwater has a SG of 1.025, more in tropical regions, less in colder regions or in rivers, harbours with fresh run-off.

[breamexplorer]

So would that mean, if i have a 6m boat with a 110l fuel tank (i know some one with this) and the boat has a capacity of 7 persons or a maximum weight of 630kg.. (90kg per person) If i fill the tank it would be 81 kg,, can i still take 7 people in the boat, not that you would want 7 in there anyway...

[marco]

I wonder if ethanol blended fuel has a different weight

yes it is heavier , as a rough guide for 10% it is about .750

[marco]

some figures to give you a rough idea ulp = Density at 15°C, kg/L 0.735 . diesel = Density at 15°C, kg/L 0.820 - 0.860 . jet a1 = Density at 15°C, kg/L 0.79 . pulp = Density at 15°C, kg/L 0.750 . avgas = Density at 15°C, kg/L 0.700

[seatime]

So would that mean, if i have a 6m boat with a 110l fuel tank (i know some one with this) and the boat has a capacity of 7 persons or a maximum weight of 630kg.. (90kg per person) If i fill the tank it would be 81 kg,, can i still take 7 people in the boat, not that you would want 7 in there anyway...

it might be a bit off topic, that maximum capacity of 630kg is the total of all weights you're allowed to carry, not just people. If 7 POB plus gear weighs more than 630kg, then you're overloaded as I understand it. Does this includes fuel ?, something I will try to clarify. Not sure how they could determine how much fuel a 6m boat carries, boat #1 110lt, boat#2 150lt or even 200lts. Guess you'd find out the hard way if there was an investigation into an accident or incident. Keep in mind that max capacity in for Smooth Water limits only, if you travel into waters beyond Smooth Waters you'll need to reduce the load accordingly. This would be your "Safety Obligation" or Duty of Care.

Steve

[Cheech]

The max weight will be determined by the manufacturer. They would have to do it based on full standard tanks.

The 7 limit is a Marine Safety Queensland (or whatever other state authority) requirement and is the max in "Smooth waters". Does not say with or without full tanks so is irrelevant.

So the answer is, yes you can still take 7 persons (in smooth water). Where this gets interesting is the max weight. I am not sure if the max recomendation by the manufacturer comes into account when it comes to what you can or cannot do and still be legal. Is it actually just a suggested maximum similar to the sugested maximum hp rating for teh boat? ie; if you go over the hp rating, does not mean your boat is illegal.

Cheech

[seatime]

craig_k,

I assume you're referring to the figures off a MSQ capacity label as the 7 people 630kg matches with their tables for a vessel under 6m.

http://www.msq.qld.gov.au/Home/Safety/Capacity_labels

As stated on the website, if you have a manufacturers plate or Aus Builders Plate detailing max people capacity and load, use that as a guide. If there's no plate, contact the manufacturer, or attach a capacity label and use that as a guide.