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Bird Seismic uses an Accelerated Weight <br />Drop (impact hammer) Source formerly <br />by Digipulse now built under United <br />Service Alliance, Inc. <br />2012 Configuration Shown <br />AF450 Hammer - Wt. 458 Lb's <br />Truck Gross DOT - Wt. 25,000 Lb.'s <br />Example striker plate imprint in sandy soil <br />_, nc <br />Bird Seismic uses an accelerated weight drop as a seismic energy source, <br />includes a striker positionable weight (impact hammer) over a surface, <br />and a compressed gas spring configured to drive the striker toward the <br />surface thus creating seismic waves within the surface. In this <br />embodiment the striker is slidably coupled to the compressed gas spring. <br />Qw <br />l <br />Specifications ' <br />Features / Notes <br />Model <br />AF450 <br />Autofire, P wave <br />Assembly weight <br />1825 Ibs (828 kg) <br />Overall height <br />92 in (234 cm) <br />Hammer weight <br />458 Ibs (208 kg) <br />Flight distance <br />16.50 in (42 cm) <br />Fully enclosed <br />Nitrogen spring <br />Single <br />Serviceable <br />Nitrogen pressure <br />range <br />500 -2000 psi <br />(34.5 -138 bar) <br />Regulated, adjustable <br />Qw <br />l <br />