This is just silly. Sure, it might weigh more than a normal arrow, but this is clearly ridiculous. For example, a traditional arrow for a longbow probably won’t mass more than 600 grains (or around 40 grams) and be about 30 inches long. Now, modern arrows are far lighter, often around 300-400 grains or just under 20 grams. From looking at this site, you can see that the minimum mass of an arrow needs to be about five grains per pound of draw, and that for every five grains over this one FPS will be lost.
Now, let’s look at the fire arrows. Five arrows weighing ten pounds, giving a mass of two pounds per arrow. That’s fourteen thousand grains, or 900 grams. Now if you’re shooting that from a bow with a 60lb draw weight, let’s do the math.
Now, from the IBO* standard mentioned above, you need a minimum arrow mass of 300 grains for a 60 pound bow, and that for every additional five grains you lose 1 foot per second of velocity. Now, giving the generous assumption that the arrow is traveling at 300fps, let’s see what happens.
14,000/5 = 2,800
That 2,800 is a loss of over nine times the initial velocity of the arrow. See the problem?
Now, all hope is not lost. There is still a way of balancing flaming arrows. While I have not messed around with the arrows in question yet, there are some logical, common-sense assumptions that can be made.
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Flaming arrows will do relatively little damage on impact, and most of it will be imparted as blunt trauma due to the soaked cloth wrapping.
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They will be far less accurate than normal arrows due to the irregularities of the incendiary portion, not to mention being on fire.
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They will be shorter ranged than normal arrows due to their increased mass.
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Having a backpack full of bits of cloth and wood soaked in gasoline can be a terminally bad idea near sparks and especially an open flame. Perhaps one would need to craft a specialized leather quiver to reduce this risk…
So long as these three common-sense things are met and their weight is brought to something somewhat reasonable, they are as balanced as one can logically get. Exaggerating any of these effects is quite unrealistic, annoying, and rather silly.
Now, can these arrows be crafted with liquor like vodka? If so, it would make sense to remove this recipe due to ~40-50 abv alcohol’s low burn temperature. Gasoline, oil, or animal fat would be much better choices for an effective incendiary device.
In the end, we have less accurate, somewhat heavier, shorter ranged, higher weight and volume arrows that are more difficult to craft and can set you on fire if you mess around with them next to an open flame. Is that not balanced?
EDIT: Kevin Granade, y u so ninja?