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Diamond IceMan Test Results

image026By Anthony Barnum 

 

www.ArcheryEvolution.com

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Introduction:

For the first time ever, Center Pivot riser technology is paired up with a single cam power plant in Diamond Archery’s flagship offering for 2009, the IceMan.  Utilizing this configuration, which has been used in the BowTech lineup for the past 3 years, provides many benefits to the IceMan, not the least of which is in the vibration / noise category.  Like its Bowtech brethren, the IceMan minimizes the use of e-clips for securing limb assembly components in place which is a benefit to the shop-owner and consumer alike.  Aside from this riser and limb configuration, the Iceman features a new single cam system that offers great adjustability.  Like its cousin, the BowTech Admiral, a rotating module is incorporated to cover the full spectrum of available draw-lengths, 24-30”, without the need for replacement modules.  This cam system also integrates an adjustable draw-stop, which helps to provide a hard back wall, while also providing timing marks to aid in the tuning process.  The streamlined roller-guard assembly and the more conventionally located string suppressor (now attached below the grip) round out the updates to the IceMan.

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The IceMan sample that was provided to Archery Evolution was measured to have a brace-height of 7.438 inches, while the axle-to-axle length was measured to be 31 ¼ inches.  The requested 29 inch, 60 pound model was measured straight out of the box to have a 29 7/32 inch draw length and peak draw-weight of 63.8 pounds.  At these settings, The IceMan achieved an average speed of 304.2 fps when shot by hand in the out of box configuration (brass nock installed) with a 300 grain arrow.  When shot from the shooting machine with the addition of a string loop, the IceMan achieved and average speed of 302.5 fps at these settings.    Even though the draw-length was within the test specifications, Diamond requested that the IceMan be set to exactly 60 pounds, 29 inches.  A slight adjustment to the integrated draw stop and limb bolts brought the bow into exact specifications in short order.

 A thorough examination of the finish quality showed only minor imperfections.  Minor fraying in the serving around the loop end of the string was noticed and some excess grease on the Center Pivot structures was evident.  Some bubbling in the finish on the limbs was felt, as well, and there were minor “pin-point” areas void of film dip finish on the bottom limbs.  Other than these items, the finish on the IceMan was quite good and coverage of the interior portion of the riser cut-outs with film-dip finish was excellent.

Detailed Test Results:

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 Speed / Performance Measurements:

Speed measurements were made with 4 different arrow weights to determine the average speed of the bow per inch of Power Stroke.  Utilizing the stored energy obtained from the Force-Draw curve, average dynamic efficiency was calculated.

 Speed per inch of

Power Stroke:     12.8

Dynamic Efficiency:        78.6% 


 Vibration Measurements:

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Vibration measurements were made with 4 different arrow weights to determine the average vibration in 3 dimensions as well as the total average vibration.

 Positive X-Vibration:               34.7 g

Negative X-Vibration:             -35.3 g 

 Positive Y-Vibration:                82.5 g

Negative Y-Vibration:             -89.0 g

 Positive Z-Vibration:                53.7 g

Negative Z-Vibration:             -47.0 g 

Total Vibration:  101.3 ga 

 The addition of a 12 inch B-Stinger Pro Stabilizer with a 14 ounce weight yielded a significant reduction of peak total vibration when measured with a 360 grain arrow.

 B-Stinger Reduction:   10.4%a


 Sound Measurements:

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Sound measurements were made with 4 different arrow weights to determine the average sound output, the average A-Weighted sound output (mimicking the human ear) and the average C-Weighted sound output.

 Unweighted Sound Output:             101.9 dB

A-Weighted Sound Output:              84.5 dBA

C-Weighted Sound Output:              93.7 dBC

 The addition of the 12 inch B-Stinger Pro Stabilizer with a 14 ounce weight yielded a reduction of peak A-weighted sound Output when measured with a 360 grain arrow.

 B-Stinger Reduction:   1.6% a

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image024Anthony Barnum                 image026                                     image023Jonathan Teater

Disclaimer of Warranties, Limitation of Liability:

The authors have made reasonable efforts to ensure the accuracy and validity of their testing.  However, the authors specifically disclaim any warranty, expressed or implied, relating to the test results and analysis, their accuracy, completeness or quality, including any implied warranty of fitness for any particular purpose.  All persons or entities relying on the results of any testing do so at their own risk, and agree that the authors shall have no liability whatsoever from any claim of loss or damage on account of any alleged error or defect in any testing procedure or result.  In no event shall the authors be liable for indirect, special, incidental, or consequential damages in connection with its testing.