the development of ditching and water impact design limits
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THE DEVELOPMENT OF DITCHING and WATER IMPACT DESIGN LIMITS. PRESENTED AT INT’L CABIN SAFETY CONFERENCE NOVEMBER 15-17, 2004 LISBON, PORTUGAL DYNAMIC RESPONSE INC. (DRI) FEDERAL AVIATION ADMINISTRATION (FAA-TC). SBIR WATER IMPACT PROGRAM. PHASE I Feasibility of Methodology PHASE II

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the development of ditching and water impact design limits
THE DEVELOPMENT OF DITCHING and WATER IMPACT DESIGN LIMITS

PRESENTED AT INT’L CABIN SAFETY CONFERENCE

NOVEMBER 15-17, 2004

LISBON, PORTUGAL

DYNAMIC RESPONSE INC. (DRI)

FEDERAL AVIATION ADMINISTRATION

(FAA-TC)

sbir water impact program
SBIR WATER IMPACT PROGRAM

PHASE I

  • Feasibility of Methodology

PHASE II

  • Perform Full Scale Tests, Model and Correlate
  • Model For Existing Scale Model Ditching test
  • Evaluate FAR27/29 Water/impact/Ditching Regulations & Compliance
  • Develop Preliminary Water impact Design Limits

PHASE III

  • Develop Military Helicopter KRASH Models
  • Evaluate Correlation Techniques/Procedures
  • Develop Design Envelopes (DLE) - Water Impact/Ditching
  • Develop DLE Procedures

--- Civil helicopters

--- Military helicopters

significant questions
SIGNIFICANT QUESTIONS
  • Can modeling simulate /represent the significant aspects of full-scale impact and scale model ditching tests?
  • Can analytical modeling be an effective tool in the development of crash design criteria?
aspects of water impact and ditching
ASPECTS OF WATER IMPACT AND DITCHING
  • Kinematics Behavior
  • Overall response
  • Discrete location response
  • Failures
  • Design parameters
  • Seat-occupant performance/tolerance
  • Trends & relationships
full scale water impact tests
FULL SCALE WATER IMPACT TESTS

1998 - 1999 Tests of UH-1H

Test S1

26 fps vertical

Test S2

28 fps vertical

39 fps longitudinal

significant questions1
SIGNIFICANT QUESTIONS
  • Can modeling simulate /represent the significant aspects of full-scale impact and scale model ditching tests?
  • Can analytical modeling be an effective tool in the development of crash design criteria?
design considerations seat load limit
DESIGN CONSIDERATIONS-SEAT LOAD LIMIT

NO SEAT LOAD LIMIT

14.5G SEAT LOAD LIMIT

26 FPS VERTICAL WATER IMPACT

ditching compliance procedures
DITCHING COMPLIANCE PROCEDURES
  • Scale Model Testing

- rigid, deficient, misleading, costly

  • Similarity to Existing Designs

- questionable basis

  • Pressure Calculations

- static flotation analysis

  • Vertical Load Factor Calculations

- stall speed, no sink velocity

  • Procedures

- under-estimate pressure & acceleration

applicability to far 25 transport category aircraft
APPLICABILITY TO FAR 25; TRANSPORT CATEGORY AIRCRAFT

FAR 25, FAR 27 and FAR 29 HAVE:

  • Ditching Envelope
  • Seat Dynamic Test Requirements
  • Mass Item Retention
  • Acceptance Criteria
  • Compliance Procedures
  • Different Levels but Many Similarities
summary
SUMMARY
  • SBIR Tests/Correlation and Applications

- 2 Full Scale Water and 35 Scaled Ditching Tests

- Aircraft Weights: 10,000 -20,000- 42600 lb. GTOW

- Design Requirements & FAR Regulations

  • Development of Civil Design Limit Envelopes –

- Occupant –Seat Integrity

- Structural and Mass Retention Integrity

  • Development of Ditching and Water Impact Design Criteria and Procedures
  • Utilization of DLE to Evaluate Design Strength, Operational Conditions, Acceptance Criteria, and New Designs
  • Applicability of DLE Concept and Procedures to FAR25 Transport Category Airplanes
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