Attachment O - D21 - Ladder 251 - Pierce Turning Performance Analysis.pdf

This document is a Turning Performance Analysis for a Pierce aerial apparatus, dated August 21, 2009. The analysis provides detailed specifications and calculated turning radius measurements for an aerial device mounted on a commercial chassis platform.

The vehicle configuration includes the following parameters: an inside cramp angle of 45.00 degrees, an axle track of 82.92 inches, wheel offset of 4.68 inches, tread width of 17.70 inches, chassis overhang of 78.00 inches, additional bumper depth of 19.00 inches, front overhang of 97.00 inches, and a wheelbase of 233.50 inches. The calculated turning radii measurements are an inside turn of 18 feet 4 inches, curb-to-curb of 33 feet 1 inch, and wall-to-wall of 38 feet 11 inches. The components listed include a front axle (Oshkosh TAK-4, Non Drive, 22,800 lb), front wheels and tires (Michelin 425/65R22.50), a velocity chassis with aerials, front bumper with extended impact/velocity configuration, and an aerial device rated for a 750-pound tip load with 75-foot contender HAL single-axle capacity. The document notes that the actual inside cramp angle may be less due to specialized options and that curb-to-curb turning radius was calculated for a 9.00-inch curb.