Xbow noise source?

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lucky strike
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Xbow noise source?

Post by lucky strike » Tue Mar 03, 2009 6:33 am

I set up a short range in my basement where the sound is amplified enough to hear clearly the noise generated from the shot.From my phoenix I get a loud crak or wack sound an also a short ring as though from a tuning fork. I took off the dp's and string silencers so I could hear the raw bow.The sounds were the same but no worse.where is all this sound comming from ? I asked my girl to listen but you know how that goes!Does anyone have a definite answer?
Thanks LS

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Post by Pydpiper » Tue Mar 03, 2009 6:39 am

The tuning fork sound is likely the steel bar that holds the arrow in place, it is crashing off the rail after the arrow leaves it. It can be adjusted/modified to stop.
The other sound is simply the string going from 0 to a few hundred miles per hour back to zero again, not much you can do about that.
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Post by vixenmaster » Tue Mar 03, 2009 7:55 am

Thats the deer killing sound that all fine Excals produce. makes the deer shake n p! :lol:
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Post by Rich » Tue Mar 03, 2009 8:50 am

The only sound I hear is "smack" as my GT II slices through the deer's rib cage. The others have already covered the mechanical noises.

Rich

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Post by Cossack » Tue Mar 03, 2009 8:50 am

You can do all sorts of messin' to reduce sound and NONE if it will decrease sound to the point that the deer won't hear the bow. Sound travels at 4 times the speed of an average arrow, so.... Everything I've done only ended in disappointment and mostly loss of bow speed. So I figured, get there faster and shoot only at relaxed deer. Works.

curmudgeon

Post by curmudgeon » Tue Mar 03, 2009 10:13 am

If the tuning fork sound is annoying to you as it was to me, you might get some heat shrink tubing (electronics parts store, radio shack,etc) and shrink that over the hold down spring with a heavy duty hair drier. I also sprayed it with silicone, the slicker the better.

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Boo
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Post by Boo » Tue Mar 03, 2009 10:26 am

The arm that Pypiper mentioned is likely the source of the noise. When you do get some heat shrink get the double walled (also known as self sealing) type of tubing. It is heavier and will change the harmonics shearly by the weight change. Two other things you can do is to serve some cat whiskers about 3" onto the string about 3" from the limb tips. With the string that comes from the factory there isn't a ton more you can do other than fill the rail with foam and even then it isn't much of a reduction other than using an STS.
Make sure you do a nut and bolt check on all the fasteners.
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Post by fuzzy » Tue Mar 03, 2009 10:38 am

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Last edited by fuzzy on Sat Nov 24, 2012 9:04 am, edited 1 time in total.

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Boo
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Post by Boo » Tue Mar 03, 2009 10:45 am

fuzzy wrote:Not a definite answer but too low a brace height will allow the string/serving to slap the step in the riser adding that "crack" to the already there noise Experiments with brace heights, arrow weights and string materials before "quieting down" your bow are time well spent
Yup, I forgot about that!
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Post by x-bowhunr » Tue Mar 03, 2009 12:03 pm

Lucky strike, the ringing sound may also be from the stirrup. When you flick it with your finger or another solid object its vibration makes such a ringing sound that would be even louder and longer from the shock of firing the x-bow. That's why I attached a set of limbsaver bolt-on, vertical bow stabilizer-end attachments to the stirrup on my Equinox. Now the stirrup doesn"t ring at all when struck. Also, this is one dampener location that won't reduce velocity. Just a possible answer to what you described.
Timothy

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Post by Normous » Tue Mar 03, 2009 12:50 pm

I added camo tape to the stirrup to cut down some front end resonance and it also cuts down contact noise brushing tree limbs against the stirrup in the bush.
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Boo
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Post by Boo » Tue Mar 03, 2009 12:57 pm

enormous wrote:I added camo tape to the stirrup to cut down some front end resonance and it also cuts down contact noise brushing tree limbs against the stirrup in the bush.
Norm, I'm surprised. As a Canadian I would have thought you'd use duct tape! LOL! It's on all of my bows to stop them from slipping when I lean the bow up on the shop floor.
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Post by Normous » Tue Mar 03, 2009 1:09 pm

:lol: They make Red- Green camo duct tape
EXCALFFLICTION 1991 ->>--------> 2020
Krug Micro 355, Matrix 355 and NEMESIS
LEUPOLD VX-R 2-7, TRIJICON SRO and KAHLES Red Dot
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SWAT BH's
Teach Your Family How To Hunt So You Don't Have To Hunt For Your Family
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lucky strike
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noise

Post by lucky strike » Wed Mar 04, 2009 5:34 am

hey Guys,
Thanks for the interest in my post!-No the noise has never bothered me.While hunting I never paid any mind to the sound. Things happen too fast to be concerned. Although, I have gotten comments from my non-xbow Matthews shooting friends ie: "man that's loud". I was just curious to know where all the noise came from.

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BUS314
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agree

Post by BUS314 » Wed Mar 04, 2009 7:53 am

I tapped mine with an ink pen & it had a hammer on anvil sound

x-bowhunr wrote:Lucky strike, the ringing sound may also be from the stirrup. When you flick it with your finger or another solid object its vibration makes such a ringing sound that would be even louder and longer from the shock of firing the x-bow. That's why I attached a set of limbsaver bolt-on, vertical bow stabilizer-end attachments to the stirrup on my Equinox. Now the stirrup doesn"t ring at all when struck. Also, this is one dampener location that won't reduce velocity. Just a possible answer to what you described.

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