What Chronograph are you using?

What other arrow combination are you using to get a 2" variation?

Are you comparing a rhino nock to a solid nock? Or are you saying you have that much variation between your different arrows with the same nocks?

 

Hi,
just wandering if any of you have experienced a decrease in speed and/or accuracy of Proflight 16.5 arrows with knocks touching the ADF mechanism when releasing the trigger on excalibur micro crossbow. My chronograph shows speed variation 340-353 FPS and 2inch variation higher or lower than bull's eye at 20 yrds. Windage is not affected.
When inserting the arrow in the crossbow path and making the arrow come out slowly from the trigger area i can feel the ADF hitting the edge of the knock attached to the arrow as per the picture attached hereto.
Any comment would be appreciated




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1. • 919miles58 replied Feb 14, 2025
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Bowmore a moment ago

What Chronograph are you using?

What other arrow combination are you using to get a 2" variation?

Are you comparing a rhino nock to a solid nock? Or are you saying you have that much variation between your different arrows with the same nocks?

hi thank you for the reply
I am comparing the quill 16.5 with solid knock orinal with the bow and the proflight 16.5 rhino knock . I am using 125 gr point on both. using the caldwell chronograph i get a speed of afout 346-347 almost steady with the quill , a lot more variation with the proflight 16. 5 rhino knock as mentioned before.

 

Hi,
just wandering if any of you have experienced a decrease in speed and/or accuracy of Proflight 16.5 arrows with knocks touching the ADF mechanism when releasing the trigger on excalibur micro crossbow. My chronograph shows speed variation 340-353 FPS and 2inch variation higher or lower than bull's eye at 20 yrds. Windage is not affected.
When inserting the arrow in the crossbow path and making the arrow come out slowly from the trigger area i can feel the ADF hitting the edge of the knock attached to the arrow as per the picture attached hereto.
Any comment would be appreciated




Save Reply
Quote

1 - 1 of 1 Posts




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Related Threads

Killer Instinct Crossbows
MattDDO Feb 10, 2024
Vital X 430 Speed vs. Arrow Weight Profile
Ran the Vital X 430 through my Caldwell chrono. Here's a complete speed vs. arrow weight profile from 392 grains to 700 grains! Here is the profile if you'd like to download it: Hope this helps! -Matt

8

• 1.9KTJ_42 replied Sep 3, 2025

• [IMG]https://www.crossbownation.com/d1/avatars/s/71/71511.jpg?1728131354[/IMG]

General Crossbow Discussion
Norski Oct 18, 2024
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When talking about arrows, speed, kinetic energy and penetration are frequently discussed. Arrows kill by causing hemorrhaging. Arrows cut what they “touch”. Modern mechanicals expand the cut, but it’s still limited to what it touches. When talking about bullets, “knock down” power is added as...

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• 2.9KSEW replied Dec 16, 2024

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1. • 919miles58 replied Feb 14, 2025
2. 
   
   
   
   
   
   
   
   
   
   
   
   

About this Discussion

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1 Participant

Last post:
Bowmore a moment ago


hi thank you for the reply
I am comparing the quill 16.5 with solid knock orinal with the bow and the proflight 16.5 rhino knock . I am using 125 gr point on both. using the caldwell chronograph i get a speed of afout 346-347 almost steady with the quill , a lot more variation with the proflight 16. 5 rhino knock as mentioned before.

Though I don't use or like those nocks my adf was scratching my arrows so I removed it and put a radias on the end and polished it

 

Ah! I see, picture is worth 1000 words.

Edited for bad info...sorry

 

I thought you were comparing nock shapes. I misunderstood.

 

thanks for the advice. appreciated and will proceed accordingly..

 

Not much you can do about that , the adf rides on the arrow until the arrow clears it

 

Yes my apologies, my info was incorrect( I was a kids bday party) not paying attention.

The ADF does ride on the arrow. I'd highly doubt the variation of speed is coming from the ADF catch. The only way you could confirm would be to fire multiple shots with different nocks in the same arrow.
But I would suggest, from my experience , your Chrony(or your Chrony technique)is giving you the bad readings. Arrows are difficult to replicate consistency over the light based Chrony. Once you switch to a radar Chrony you can see how inaccurate the light based ones are.
However, as mentioned above, if it is leaving marks, by all means round it off and file it smooth. If it's not leaving terrible marks, it's not slowing the arrow.

 

I was curious about the possible effect of the ADF latch on the groove in the rhino knock.. it did catch more than my attention as i could feel the groove in the rhino nock when it was passing through the ADF mechanism at slow speed. The markings on the proflight arrows are however negligible but nevertheless raised a question as a possible cause for loss of speed and/or accuracy . I noticed also that the 4 screws holding the ADF and scope mount were loose . I removed them and put blue loctite on all 4 that might have been the primary source of the lack of accuracy noted in my initial post and also double cheked all screws on the ring and ADF ramp. Thank you all for your input and i will be testing the proflight arrows with the rhino nocks versus one quill from the original package that has only the little piece of flat knock ( about 1/8 inch) with the hole in it with same weight and I will able to see if there is any difference in speed and/or accuracy.

 

Scratches on carbon arrows is never a good thing

 

I have tested the speed with my Caldwell chrono of the proflight with rhino nock arrow vs the original quill without rhino nock both 16.5 . This after tightening the 4 rounded screws adding blue loctite attaching ADF on the trigger holes to prevent possible movement of scope.
The Caldwell has shown dual and several repetitive speeds of 343 FPS for the proflight with Rhino
and 347 again repetitive speeds for the quill without rhino nocks. Negligeable loss of speed from ADS latch.
the main issue was to obtain constant speed that I can rely on for any of these two arrows . Now I feel more confident to shoot at a deer in the vitals up to to 40 yards and obtain ethical kill with both arrows. If i miss, I cannot blame it on the engine .