If you have a bow you would like tested please contact me. 

 

 

    The quality of the data published is my top priority. My intent is to provide fact basted, data driven evaluations using repeatable testing methods and equipment.  

     There are very few absolute good or bad bows.  Every bow represents a design made up of compromises chosen by the Bowyer.  The metrics I have chosen are designed to represent each bows attributes and identify the tradeoffs within each design. 

Testing Baseline Equipment

  • A 19" DAS Tribute riser is used for all testing unless noted otherwise. I have chosen this riser for its flexibility. I can change ILF or DAS plate. I can run a very forgiving off the shelf set up or a flipper rest or with plunger. The riser has enough clearance to shoot feathers or vanes. 

  • I use  a 25" Hoyt Avalon , CD Archery WF 25 and a CD Archery WF 27.  

  • Strings used with ILF Limbs and R&D Longbows-  16 strand 8125  endless strings with 9" serving are used unless stated otherwise. All strings were made by the same string maker Champion Bowstrings and they are all of one color, black. ​​

  • Bowyer supplied strings are used with ASLs and a few other Bows. I will cover this in the test notes. 

  • 2 small digital crane scales are used for Draw Force Curve test and calibration.

  • A RCBS digital scale is used for arrow weight

  • 2 Decibel Meters are used. I calibrate prior to each test. 

  • 4 Chronographs are used. 2 for standard testing. 

  • I have 2 shooting machines and a dedicated tiller board. 

  • ATAstandards for Chrono

  • ATA Standard for Draw Length

  • My strings do not follow the ATA standard. I test them without silencers and pending length they weigh 85 grains to 95 grains. I perform a sound test with no silencers at 10gpp. 

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Metrics

  • Speed @ specific arrow weights. 7, 8, 9, 10 and 11 Grains of Arrow weight per pound of draw weight for ILF, I test at  10 and 11GPP for ASLs. I test at 9, 10 and 11 GPP for R&D Longbows.

    •  A RCBS Digital Scale is used to measure arrow weight.  Arrows are built to the exact grain. 

    • I use 2 different Chronographs in the different tests. 2 are used simultaneously for the standard speed test. LED lights are on each unit to reduce error. I leverage a Radar Chronograph for testing as well. 

    • A shooting machine is set up 3 feet from the chrono 

      • The machine is set up to align perfectly to each bow 

      • A 19" Tribute is used for all speed test unless I state otherwise. 

      • I use 2 different shooting machines specific to tests

  • Bow Set up​​

    • The Bow is set to Bowyers Brace Height Specs or 1/8th off the string groove. 

    • I verify that the bow is on plane prior to testing. ​

    • I set tiller to 1/8th positive when shooting off fingers and even for the machine. 

  • Draw Force Curve​

    • I use a scale and testing method that limits measurement error to  .03  of a pound. ​

    • I take draw force  measurements from 11" to 31" maxed out in the middle of the bolt  and 6 turns out.  I adjust BH to lift the string 1/8 off string groove and tiller at each location.

  • Sound Testing​- 2 calibrated Decibel Meters are used​​​ DBa at a fast setting. 

    • 10 ft away 3ft off the ground at 10gpp for the standard evaluation. No string silencers are used

    • I use A weighting which best reflects the frequency response of the human ear.

    • The decibel scale is a logarithmic  scale "non linear". On the decibel scale, the smallest audible sound (near total silence) is 0 dB. A sound 10 times more powerful is 10 dB. A sound 100 times more powerful than near total silence is 20 dB.

    • Normal Conversation is 60 dba and a lawnmower is 90 dba.  

    • Perceived Sound is very complicated, I am not an acoustics engineer. I have interviewed one to develop my basic test.  I am doing my best with the equipment that is within reason to obtain and use. 

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