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54mm RMS Delay Drilling Tool


  • Model: ARO 54RDDT
  • Manufactured by: AeroTech

The 54mm RMS Delay Drilling Tool™ (or RDDT54™, P/N T082510-2) is designed for shortening RMS delay elements to adjust the time delay of a 54mm AeroTech RMS reloadable motor. The RDDT54 consists of a machined drill tool body and a 1/4” stub drill bit with an attached knob. The tool also has a provision for calibration, as the tip of the drill bit must be flush with the end of the tool body for accurate use. Though adjusted initially at the factory, a set screw placed within the knob makes any necessary readjustment easy.

The ends of the tool are counterbored with recesses that are labeled with 4 or 8 second reductions in the delay time. To use, the RMS delay element is placed into the desired end of the tool and held firmly in place, the drill bit is inserted and the knob is rotated clockwise until the bit is fully seated in the delay and no resistance is felt. In addition, a supplied 1/16” thick washer may be placed between the drill tool body and the drill knob to shorten the delay to an intermediate value (i.e., shortening the delay by 2 or 6 seconds).

As is always the case with drilled RMS delays, the delay element should be installed in the motor with the drilled end facing the propellant grains (or away from the ejection charge) for best delay accuracy. Also, no delay should be shortened to less than 4 seconds.

AeroTech is planning to eventually sell most 54mm RMS reloads in only the longest certified delay, so the RMS Delay Drilling Tool will be essential for the future use of the 54mm RMS line of products.

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