What do you guys mean by determining the percentage of overall mass and doing the math? Don’t you have to know how much your arm weighs first (before you would be able to divide that number by your overall mass to get the percentage)?
I like the immersion in water and then using the pig leg idea though. Depending on your resources, you might even be able to use some other human arm (good manners would suggest that this arm should come from the body of a person who wasn’t using the arm anymore – maybe a medical school cadaver).
H