Who here is good with math


I'm trying to figure how much fuel these fuel tanks I'm making will hold.

They are 7 1/2 inches long by 3 1/2 inches wide by 1 3/4 inches deep.
What does that work out to in liquid oz's?

Anybody?

25.4 ounces

perfect!

thank you

And now for the math....

7.5 x 3.5 x 1.75 = 45.9375 cubic inches.

45.9375 x 0.5541126 = 25.4545455 Ounces (U.S. Liquid)

Or, if you don't happen to reside in the US...

45.9375 x 0.576744 = 26.4941787 Ounces (U.K. Liquid)

Or, for those who prefer metric...

19 x 8.9 x 4.4 = 744.04 cubic centimeters or milliliters (since cubic centimeters are equivilent to milliliters.)

Pretty darn close to 3/4 of a liter.



...jim

Jim

I'm kinda dumb about somethings, where does the 0.05541126 come from. Whole lot easier from what I do, Fill the tank up with water then dump into a measuring device.

I don't know where is come from, but its units must be in fl ounces/cubic inch!

Quick note for those that are making irregular shaped tanks. The simple method for measuring the volume of plugs is to find a bucket or bowl that can hold the plug plus enough water to cover the plug with water when submerged in the bucket or bowl. It helps to have two people for this...First, fill the bucket with enough water that when you push the tank plug into the water, in can be completely covered with water. second, after the plug is completely submerged in the bucket, make a mark on the inside of the bucket where the water stops rising after submerging the plug. Remove the plug, get an accurate measuring cup, at least 32oz. Fill the measuring cup with water to an amount less than the projected volume of the plug, write the number from the cup down and pour the water into the bucket. Repeat the process until the water reaches the line on the side. The result will be close to the exact volume of the plug. The works for male tank molds only, and is only approximate to an ounce or so. It's a good idea to do this twice to confirm the volume.[8D]

Dan Gill,
Details 4 Scale

Maybe a rather unscientific way , but when I finish my tanks I emerge them in a bucket of water and measure the water displacement...... This way you also (dis)counting the radius and other strange shapes...
You can also fill them completely and then empty them in a kitchen measuring bucket......
([8D].....make sure you clean them properly beforev returning to you wife....)
The math is a nice thing but when difficult when having strange conformal cells

Regards,
Gerald

....Hi dan, you just was a tenth earlier....

Gerald

....or, since it's for a fuel tank anyway, a simple (and actually more acurate) way is to fill the darn thing with fuel, then empty it out into a measuring jug.

That way you are actually measuing the volume of fuel that the tank holds (which is what you really care about) rather than how much space the exterior of the tank displaces.

Gorodn

Bob-o,

http://www.onlineconversion.com/

(Just one of many such sites. But I like this one. )

And yes, filling the tank up and dumping it into a measuring device would work wonders. But what if you're in the design stage and don't actually have a tank to fill up?

Regards,
...jim

Well, if you're just in the design stage, then you can't dunk the "finished tanks" into a bucket, as was suggested in the post that I replied to