chrono'd my crossbow

tac-driver

tac-driver

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Well I just reassembled my crossbow to get ready for upcoming turkey season. I had just bought a new chrono and thought it would be a good time to chrono the bow as well as sight it in. I'm shooting an Excaliber Exomax with 135 grain wasp broadheads on carbon fibre bolts. With the string tension set to the factory hatch mark on the body of the bow I was acheiving 346 FPS. I removed the one end of the string and gave her one full twist to tighten it more and shot again. The arrow's impact was 3 inches higher at 40 yards but the FPS did not change at all, still 346. This doesnt make a whole lot of sense to me, higher impact on target should mean a little faster.
I ended up putting the string tension back to the lower setting because I figured why stress the limbs if I dont have to and still acheive the same speeds. I encourage you all to try this experiment with your bows and see if the results are simular:)
 
is the string on the line closest to the limbs or the line closest to the triger end?

mine was set in the middle before i took my bow apart for storage. i have an exomax as well shooting gold tip 2's with 100gr slick tricks. i think im using around the lightest bolt weight you should go with the exomax which is why i think i may switch to heavier bolts and/or broadheads to pack some more punch.
 
canadian hunter312 said:
is the string on the line closest to the limbs or the line closest to the triger end?

mine was set in the middle before i took my bow apart for storage. i have an exomax as well shooting gold tip 2's with 100gr slick tricks. i think im using around the lightest bolt weight you should go with the exomax which is why i think i may switch to heavier bolts and/or broadheads to pack some more punch.
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The string is on the line closest to trigger end. I was shooting 125 gr broadheads then stepped up to 135 to utilize the power of the exomax. I shot doe through ribs at 50 yds last fall and had to dig bolt out of tree behind her. She didnt even know she got hit at first, walked calmly for 60-80 yards and then layed down for "big sleep"
 
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tac-driver said:
The string is on the line closest to trigger end. I was shooting 125 gr broadheads then stepped up to 135 to utilize the power of the exomax. I shot doe through ribs at 50 yds last fall and had to dig bolt out of tree behind her. She didnt even know she got hit at first, walked calmly for 60-80 yards and then layed down for "big sleep"
Click to expand...

Your Exomax should have the string set on the line closest to the riser. And tightening the string by twisting it will not give you more arrow speed... it will actually slow your arrow down. (if you read the instructions or watched the video you would know this).:redface:
The Excaliburs are designed to have a very long power stroke and the string actually picks up speed the closer it gets to the end of its travel.
Your use of 135 grain broadheads is redundant with an exomax... they perform at peak efficiency with a carbon arrows and 100 grain broadheads. Kinetic energy with a 360grain arrow is 99 pounds... a broadhead that wieghs 35 grains more is not going to increase your kinetic energy enough (if any) to make up for the loss of trajectory.
I have chronyed my Exomax consistently at 356 fps... shooting gold tip arrows (5 inch feather fletch) and 100 grain Muzzy broadheads.:cool:

read here....> http://www.excaliburcrossbow.com/arrowselect.html
 
tac-driver said:
Well I just reassembled my crossbow to get ready for upcoming turkey season. I had just bought a new chrono and thought it would be a good time to chrono the bow as well as sight it in. I'm shooting an Excaliber Exomax with 135 grain wasp broadheads on carbon fibre bolts. With the string tension set to the factory hatch mark on the body of the bow I was acheiving 346 FPS. I removed the one end of the string and gave her one full twist to tighten it more and shot again. The arrow's impact was 3 inches higher at 40 yards but the FPS did not change at all, still 346. This doesnt make a whole lot of sense to me, higher impact on target should mean a little faster.
I ended up putting the string tension back to the lower setting because I figured why stress the limbs if I dont have to and still acheive the same speeds. I encourage you all to try this experiment with your bows and see if the results are simular:)
Click to expand...

The effect of the limbs and string of your bow, or any bow, moving in a forward motion upon release is called cast. To get the maximum efficiency out of your bow requires one utilize the cast of the bow to the maximum. By shortening the string you are for all intents and purposes starting to draw the bow reducing the travel of the string thus reducing cast, bow efficiency and even fps. The amount of twists in a string is a calculated formula, owners manual, and unlike other things a few are good but lots are not better. The reason one puts twists in a bow sting is to make the string cylindrical with no flat surfaces.
 
Glad to see another xbow shooter. I shoot the Excalibur Paradox. It was their only venture into the compound xbows. Tons of power! I shoot targets with goldtips and a 100 gr. tip and get 352 fps. For hunting I use 2219 alums with 100 gr. G5 Montecs. Here's a pic. Gotta love it! - Jason

fb995669.jpg
 
I had a Paradox and I shot it a lot but I could never get it to shoot the advertised speed of 335fps. I found it a little heavy for me and I had some melt downs of cables, strings and guides so I sold it.
Isn't this crossbow being sold under another name now?
 
So is a exomax the best Excaliber crossbow to buy?? I had and sold a barnet rino and am thinking of getting a recurve excaliber any recomendations.?
I want a real good one.
 
dingus said:
So is a exomax the best Excaliber crossbow to buy?? I had and sold a barnet rino and am thinking of getting a recurve excaliber any recomendations.?
I want a real good one.
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The quality of all Excaliburs is equal, as they use all the same components. They differences lie in the speed of the bow, which is corresponds directly with the draw weight. The fastest/most powerful in order are:

Exomax - 225 lbs. draw weight
Exocet 200 - 200 lbs.
Phoenix - 175 lbs.
Vixen - 150 lbs.

The best source of info is on their website or forum.

http://excaliburcrossbow.com/
 
The quality of all Excaliburs is equal, as they use all the same components. They differences lie in the speed of the bow, which is corresponds directly with the draw weight. The fastest/most powerful in order are:

Exomax - 225 lbs. draw weight
Exocet 200 - 200 lbs.
Phoenix - 175 lbs.
Vixen - 150 lbs.
Click to expand...
All being equal yes, but with recurve limb, wheels, and cams, the draw weight theory goes out the window.
Frank
 
Found this looking at other stuff, thought you xbow users would like it.:)

TOP TEN CROSSBOW RULES
*Read and understand your owner痴 manual thoroughly before ever shooting your crossbow.

*Never carry a cocked crossbow with an arrow in it while walking.

*If hunting from a treestand, always #### the crossbow on the ground before climbing into stand.

*Never raise or lower a cocked crossbow from a treestand with an arrow in it.

*Always keep ALL fingers below the rail when shooting an arrow.

*Never dry-fire a crossbow.

*Always identify your target and area beyond it before shooting.

*Never use a cocking device to uncock a crossbow.

*To uncock a crossbow, shoot an arrow tipped with a field point into soft ground or a target.

*Make sure that the limb tips are free of obstructions before shooting.
 
Ok one question I have always had is this. If a compound bow has around 60lbs and a Xbow has 150lbs of draw weight, why are the FPS so close together? I was looking at some catalogs. and the compound bow was faster the the Xbow set with more then double the pounds? Anyone?
 
It's all based on grains per pound. Basically a vertical bow pulling 60 lbs, shooting 5 grains of arrow per pound of pull, (mfg. suggested minimums) would use a 300 grain (total weight) arrow, and a crossbow pulling 150 lbs would require an 750 grain (total weight) bolt. Both would achieve roughly the same speed. I hope this helps. -Jason
 
Cause your looking at a recurve xbow, versus a compound with cams/wheels which speed up the bow string as it lets loose,
mechanical advantage(When a machine puts out more force than is put in, the machine is said to have mechanical advantage).
Bolts are pretty light and blead off energy quickly.
Frank
 
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CTS said:
Ok one question I have always had is this. If a compound bow has around 60lbs and a Xbow has 150lbs of draw weight, why are the FPS so close together? I was looking at some catalogs. and the compound bow was faster the the Xbow set with more then double the pounds? Anyone?
Click to expand...




First off, a compound Xbow with any letoff is redundant, and a waste of good energy, secondly, the advantage of having a "Compound" Xbow is usually they have a bit shorter powerstroke, so they arent as long as a recurve Xbow, and shorter limbs. Is that really an advantage? No. I sold my Compound Xbow and bought an Excal Exomag. a 150lb Compound Xbow shot@ 262 fps with a 16inch 2216, and a 100gr fieldpoint.
A 20 inch 2219 with a 100gr Fieldpoint out of my Xcal does 331FPS.

The reason Compound/mechanical bows @ 60lbs equals a Xbow @ 150 is the powerstroke. In most cases, the arrow weight is close to, if not equal between the two, but your compound bow has anywhere from 6-10 inches more powerstroke than the Xbow. Both have equal energy/speed, but generate it differently...

Cams and wheels on a compound accelerate the string much faster than a recurve bow, but when your talking about a 225lb draw, you cant go much faster...
 
Levi Garrett said:
*Make sure that the limb tips are free of obstructions before shooting.
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Very important to pay attention to. Wanna be removed form a treestand like an acme Ejector seat? have a limb too close to a tree before firing:D
I've done it in a 3D shoot where the course organizers thought it would be good to make it very challenging, and did. YOu had to shoot through a small V in the trees... Shold stepped back a bit farther...

I got punched in the face by my own Xbow:D
 
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