Accession Number:

AD0775818

Title:

Development of Manufacturing Methods for Ballistically Tolerant Fiberglass Tubular Bellcranks

Descriptive Note:

Technical memo.

Corporate Author:

ARMY AIR MOBILITY RESEARCH AND DEVELOPMENT LAB FORT EUSTIS VA EUSTIS DIRECTORATE

Personal Author(s):

Report Date:

1974-01-01

Pagination or Media Count:

35.0

Abstract:

The development of manufacturing methods for a ballistically tolerant fiberglass tubular elementsandwich CH-47 forward bellcrank which would optimize production costs and weight while achieving structural repeatability, is discussed. Complete fabrication details are pre-sented. Ballistic, fatigue, and static tests, conducted at -65, 75, and 180 F, showed that the bellcrank met the design requirements. The manufacturing techniques developed resulted in both substantial weight savings 1.65 lbs compared to 3.4 lbs for a metal bellcrank and cost savings 68.00 compared to 135.00. A slotting technique that localized the ballistic damage on the exit face sheet and prevented gross delaminations was developed.

Subject Categories:

  • Helicopters

Distribution Statement:

APPROVED FOR PUBLIC RELEASE