APPENDIX SUSPENSION LINE TEMPERATURES

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP75B00285R000400130010-3
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 2
• Document Creation Date: December 12, 2016
• Document Release Date: February 27, 2002
• Sequence Number: 10
• Content Type: STUDY

Approved Fon?lease 2002/06/24: CIA-RDP75B002$&000400130010- P-959
Page Al
APPENDIX
Suspension Line Temperatures
From an analysis performed by the thermodynamics group, the peak
temperature predicted on the suspension line was 340"F. This
temperature is for an ejection at 3. 2 Mach at 95, 000 ft. where the
peak horizontal ribbon temperature is 590cF. While no data could
be found for temperature exposures of a few seconds which exist in
this application, the strength of nylons shown be'ow is for temperature
exposures of five to te-i minutes. It should t,e doted that the peak drogue
load and peak temperature do n>t coi`_lcide.
Ejection At
Peak
Temperature
Horizontal Ribuon
Sus opens ion Line
Suspension Maximum .
Line Total JAt Peak Temperature
Lit-nit Load
Nylon Suspension Line Total Stren th
at Peak Temperature
Limit Margin of Safety (Pa-~alLo?- - 1 )
1. 4 Mach
450 KEAS
36, 500 ft.
Low
Low
9, 650 lb,
9, 650 lb.
16, 000 lb.
450 KEAS
69, 300 ft.
500?F
300?F
590?F
34007F
4,100 lb.
2, 600 lb.
8, 700 lb.
1, 200 lb.
1, 100 lb,
7, 600 lb.
Since the critical condition on the suspension lines occurs for an ejection
at 1. 4 Mach where the temperature is low, the use of HT-i (Nomex) would
not produce a stronger suspension system for this critical condition.
5X1
5X1
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 SP-959
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There are three advantages that regular nylon has over HT-1:
1. Equivalent I-IT-1 suspension lines would have about 25% more
bulk and would cause packing problems.
2. Nylon has greater energy absorption characteristics since
HT-1 has about 75% of the elongation of nylon.
3. HT-1 costs six to seven'times as much as re';ular nylon.
Allowable strength figures are based on ratios derived from Fig. 18 of
Part II for nylon shroud cord MIL-C-5040, Type III from the following
reference.
Coplan, M. J. and Singer, E. , A Study of the Effect of Temperatures
on Textile Materials, Part I, March 1953, and Part II, July 1953,
WADC- TR 53-21, Part I and Part II.
Approved For Release 2002/06/24: CIA-RDP75B00285R000400130010-3