Main Discussion Area > Flight Bows
FOC, center of pressure and performance
DC:
Theoretically, if the dry fire speed is the same, then then will both only shoot a 0 grain arrow at the same speed. As the arrow weight increases the bow that stores more energy will take the lead. But that's only my 2cts worth. :D :D
joachimM:
dry fire speed isn't about theoretical 0 grains arrows, it's the speed at which reducing arrow mass doesn't yield higher initial velocity. It may be that the dry fire speed of two bows is identical, one with 250 grain arrows, the other at 350 grain arrow. The heavier arrow will fly farther, because of its higher energy content (energy = mass times velocity squared).
With the same bow design, identical dry fire speed at higher arrow mass requires a larger bow, hence scaling up the bow.
Badger:
--- Quote from: joachimM on October 03, 2017, 03:50:16 pm ---dry fire speed isn't about theoretical 0 grains arrows, it's the speed at which reducing arrow mass doesn't yield higher initial velocity. It may be that the dry fire speed of two bows is identical, one with 250 grain arrows, the other at 350 grain arrow. The heavier arrow will fly farther, because of its higher energy content (energy = mass times velocity squared).
With the same bow design, identical dry fire speed at higher arrow mass requires a larger bow, hence scaling up the bow.
--- End quote ---
Dry fire speed is just that, dry fire speed, there is no lower limit where they quit getting faster as you lighten the arrow. If there is close to one it is way below an practical arrow weight. I have tested them down below 100 grains and they keep getting faster.
Badger:
--- Quote from: DC on October 03, 2017, 03:22:26 pm ---Theoretically, if the dry fire speed is the same, then then will both only shoot a 0 grain arrow at the same speed. As the arrow weight increases the bow that stores more energy will take the lead. But that's only my 2cts worth. :D :D
--- End quote ---
Energy storage isn't the big factor when dealing with light arrows, efficiency is the big one. Higher energy storage along with efficiency is a good thing especially when it allows you to shoot a heavier arrow at a desired velocity. As arrow weights get lighter the gap in speed between high energy storers and highly efficient bows starts narrowing. Eventually the more efficient bow will overtake the higher energy storing bow unless they are just too far apart to begin with.
joachimM:
It seems the point I was trying to make is missed here, as it's not about dry fire speed per sé. It's that, IMO, a heavy arow shot at the same initial velocity will fly farther than a light arrow, because, unlike bow and arrow dimensions, air density (and thus drag) cannot be scaled up or down, it remains the same.
But it's close to the obvious, since we already know heavy flight bows shoot farther than light flight bows...
This said, can you explain, Steve, how you think larger bows and more energy storage will aid flight shooting?
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