Flight service evaluation of PRD-49/epoxy composite panels in wide-bodied commercial transport aircraft

Fairing panels were fabricated to evaluate the fabrication characteristics and flight service performance of PRD-49 (Kevlar-49) a composite reinforcing material and to compare it with the fiberglass which is currently in use. Panel configurations were selected to evaluate the PRD-49 with two resin matrix materials in sandwich and solid laminate construction. Left and right hand versions of these configurations were installed on L-1011's which will accumulate approximately 3000 flight hours per year per aircraft. The direct substitution of PRD-49 for fiberglass produced a twenty-six percent weight reduction on the panel configurations. Examination of these panels revealed that there was no visible difference between the PRD-49 and adjacent fiberglass panels

Effect of treatment on fence posts

Cover title.Includes bibliographical references

Ventilation of animal shelters

Caption title.Digitized 2006 AES MoU

Farm building studies in northwest Missouri

Publication authorized August 7, 1934.Includes bibliographical references

The durability of fence posts

Cover title

The curved roof machinery building

Caption title.Digitized 2006 AES MoU

Emergency storage for soybeans

Caption title.Digitized 2007 AES MoU

Buildings for the dairy enterprise

Cover title.Includes bibliographical references

The durability of fence posts

Caption title