Accession Number:

AD1009444

Title:

ACES II Seat Roller Study: Findings of Detrimental Friction under High Windblast or Adverse Flight Conditions

Descriptive Note:

Technical Report,28 Jan 2013,12 Aug 2015

Corporate Author:

SPACE WING (45TH) PATRICK AFB FL PATRICK AFB United States

Personal Author(s):

Report Date:

2015-08-12

Pagination or Media Count:

45.0

Abstract:

Analytical findings of an intrinsic, detrimental high-friction response of the ACES-II Ejection Seats legacy seat roller six metal wheels on six dry metal shafts when subject to high loads such as windblast from a 600 KEAS ejection, or adverse aircraft conditions of yaw or roll rate. Verification and validation is provided through 6-DOF mechanical-dynamics simulations, classical hand calculations, comparison against the F-16 Aviano Mishap data, comparison against sled tests 110E-A1 of 2012 F-16 at 600 KEAS, with forward 5th percentile and aft 95th percentile manikins, and theoretical discussion of the dynamic mechanical relations. Two recommendations are made, 1 Replace the current ACES-II seat rollers with modern industrial cam rollers or similar load-rated roll-and-thrust bearing wheel system, and 2 insure that no future ejection seat system such as an ACES 5, Mk 16, or other with limited-energy propulsion such as a propellant charge is fielded to the fleet without a seat-to-aircraft release system that maintains a friction coefficient below 0.01 under normal X-axis loads of 10000 lbf and lateral Y-axis loads of 1500 lbf.

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE