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PowWow / An Archer is born
« Last post by Kirkll on Today at 01:34:21 PM »
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PowWow / Re: First Deer! First Post!
« Last post by LookMomNoSights on Today at 12:35:35 PM »
heck yeah!  Great job and congrats!  :clapper:
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PowWow / Re: FPS vs bow weight?
« Last post by LookMomNoSights on Today at 12:33:38 PM »
Kirk, we posted at the same time  :biglaugh:
So case in point OP ...... listen to Kirk and the other great bowyers we have hanging around here ....... lucky to have them  :thumbsup:
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PowWow / Re: FPS vs bow weight?
« Last post by LookMomNoSights on Today at 12:31:37 PM »
I would get this one over to the Bowyers Bench forum......   great people over there talking about all that technical stuff and plenty of them REALLY know what they are talking about......... they can probably answer your question better than you expected.
 A certain poundage pulled may be the exact same from 1 bow to the other,  but geometry is just 1 of the sciences involved in a bow build and not all say 50lb draw bows are created equal,  bank on that!
  :thumbsup:
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PowWow / Re: FPS vs bow weight?
« Last post by Kirkll on Today at 12:27:50 PM »
All bows are not created equally, and you will have a lot of different answers to this question that will mostly be speculation. Draw weight and energy storage, vs how much energy actually gets transferred to the arrow totally depends on the bows limb design.

Even using the same identical bow design in different draw weights can make a big difference even if the GPP (grains per pound) are closely matched. I can give you a good example...

Take an ASL design bow with very low preload in the limbs. These bows draw very smooth in the first few inches of the draw and slowly gain pounds per inch throughout the draw cycle. These bows typically have very poor performance in lighter draw weights compared to higher preload limb designs like some recurves and hybrid long bows do....  But... once you start increasing the draw weight on these ASL long bow designs, the performance increases a lot due mostly to higher preload, or more tension on the string at brace.

One of the key components of a bows performance is not just how much energy is stored in the limbs, but how much of that energy is transferred to the arrow. Some bow designs are much higher in performance than others, but even high performance designs have different performance levels depending on draw weight. for example... a 30-40# high performance recurve or hybrid bow shooting 300 to 400 grain arrows. (10 GPP) drawing 28" will have significantly lower performance than that same exact limb design at 50-60# draw weight shooting 500-600 Grain arrows. The heavier limbs with heavier arrows may be 10-15 FPS faster in some cases.

Why?   I could write a full chapter in a book explaining the details, but the bottom line is the ratio of limb mass to preload is much different, which results in less energy being transferred to the arrow. or simply put... it's the lower draw weight limbs not having enough string tension at brace to stop the limbs clean and transfer the same amount of energy.

You can get into some other of the same factors with longer draw lengths vs shorter draw lengths and different limb designs too....   

So to answer your question, there is no rough formula with so many different factors involved.

Kirk
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PowWow / Re: Mountain benches
« Last post by Matt Fowler on Today at 12:16:58 PM »
I haven't had a chance to hunt them. I have a good stand about 300yds south of them and want to hunt that as much as possible. Definitely heating up here, lots of fresh rubs but scrapes are cold.
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PowWow / Re: FPS vs bow weight?
« Last post by Orion on Today at 12:00:07 PM »
If you use the same gpp, arrow speed shouldn't change much at all as bow weight goes up, all other things being equal.  You will be shooting progressively heavier arrows at the same speed. I've read, but haven't tested, that a# of bow weight increase yields a 1-1 1/2 fps gain in speed. I don't know if those who offered that figure accounted for a change in arrow weight.   
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PowWow / Rancho Safari quality ghillie options?
« Last post by Morning Star on Today at 11:42:47 AM »
I see Rancho is no longer in business.  Looking for suggestions for a durable well fitting suit like the shaggie suits used to be.  Any out there?
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PowWow / Re: Finely made it back after Helene
« Last post by rastaman on Today at 11:41:33 AM »
Glad you guys survived the storm without much damage!
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PowWow / Re: FPS vs bow weight?
« Last post by KentuckyWolf on Today at 10:45:48 AM »
Depends on the style of bow and construction.

I can’t get to it right now but there was a really good section on this in one of the “bowyer bible” books
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