nose landing gear drop report · lihltr-1 drop test report h. w. loud machine works. inc. pomona,...
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REPORT NUMBER 155
MARCH 1965
NOSE LANDING GEAR
DROP TEST REPORT
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• CONTRACT NUMBtR DA44-177-TC-715r.
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REPORT NUMBER 155
NOSE LANDING GEAR DROP TEST REPORT
XV-5A Lift Fan Flight Research Aircraft Program
March 1965
ADVANCED ENGINE AND TECHNOLOGY DEPARTMENT GENERAL ELECTRIC COMPANY CINCINNATI, OHIO 45215
ISllLiTR-l DROP TEST REPORT
H. W. LOUD MACHINE WORKS. Inc. POMONA. CALIFORNIA
Page 2
TABLE OF CONTENTS
Paragraph
1.0
2.0
3.0
4. 0
5.0
Figure I
Figure U
Figure III
Figures IV, V.VI, & VII
Appendix A
Appendix B
Page
General 3
Applicable Documents 3
Summary 3
Discussion 4
Results 6
Drop Test Tower 7
Reaction Platform 8
Configuration of the Metering Pin and Orifice. . 9
Curves of Vertical Load va Stroke 10 thru 13
Tablo II Drop Test Requirements,Pago 13 of Drop Test Procedure 1511LTP-4
Wire Confirming Test Requirement Deviation
liHLTR-1 DROP TEST REPORT
H. W. LOUD MACHINE WORKS. Inc. POMONA, CALIFORNIA
Page 3
1.0 GENERAL:
The 1511L.100 Nose Landing Gear Shock Strut was tested on 26 July
1963, in accordance to the H. W. Loud Test Procedure 1511LTP-4,
Revision "A". This report presents the successful completion of
the established test requirements.
The tests were witnessed by Ryan and H. W. Loud Quality .Control
and Mr. Fred Döring, F. A.A. Western Regional Headquarters.
2.0
2. 1
2. 2
2. 3
APPLICABLE DOCUMENTS:
15HLTP-4, Revision "A", H. W. Loud Drop Test Procedure
SCDL0002. Ryan Nose Gear Specification
Wire dated July 25, 1963 confirming test requirement deviation.
3.0 SUMMARY:
The results of the tests demonstrate satisfactory energy absorbtion
characteristics of the shock absorber.
The first teat condition results rmiets the requirementu of thu deviation
allowance.(see Appendix B). The vertical reaction exceeds the orig-
inal requirements for approximately . 05 oeconds at a strut stroke
of 4. 15 inches with a maximum of 6600 pounds.
r Ci
lr.llLTR-l DROP TEST REPORT
H. W. LOUD MACHINE WORKS. Inc. POMONA. CALIFORNIA
Page 4
3.0 SUMMARY: (con't)
4.0
The second condition results meets the test requirements.
The official test for condition three was run with an additional 200
pounds on the jig that was anticipated to correct for friction in the
drop tower. The results indicate, however, excessive energy in-
put. A prior run is also Included with the correct Jig weight and
with insufficient energy input to show the effect of the weight change.
Both runs are well within the maximum allowable vertical reaction.
DISCUSSION:
The shock strut was mounted in the drop tower (See Figure I). The
ground reactions were measured with a reaction platform (See Fig-
ure II). The strut was serviced with hydraulic fluid and extended
with 154 psig air pressure. The tire was inflated to 155 psig.
The tests were performed in accordance with the 1511LTP-4 Test
Procedure. See Appendix A for a copy of the test requirements
taken from the procedure.
1 .UL.TK-1 DROP TEST REPORT
H. W. LOUD hdACHINE WORKS. Inc. POMONA. CALIFORNIA
Page 5
4, 0 DISCUSSION: (con't)
A deviation was granted by Ryan (See Appendix B) on condition
number one allowing for an increase in vertical reaction to 7000
pounds after the first four inches of strut stroke.
Figure III shows the configuration of the metering pin and orifice.
ItUlLTR-l DROP TEST REPORT
ti W. LOUD MACHINE WORKS. Inc. POMONA. CAUPORNIA
Page 6
5,0 RESULTS:
The test rcsulta are given in Table I. The curves of vertical load
va stroke are given in Figures IV. V, VI, and VII. The actual test
records are fold out pages
T A Rl^ P I Henord No. 9691 9687 9685 9680
Results * Cond. 1
Cond. 2
Cond. 3
Cond. 3 in* Units
Wheel Speed ■ 2200 - 2570 2550 rpm
Max. Vertical Reaction
6600 8270 4070 3800 pounds
Max. Drag Reaction 2060 - 1760 1360 pounds
Jig Contact Velocity 10.02 10.0 6. 1 6. 1 feet/second
Total Strut Stroke 6.44 7.42 5.84 5.86 Inches
Total Mass Travel 8.07 9.92 7. 35 6.37 inches
Strut Efficiency 83.6 75. 5 - - percent
Energy Absorbed 3670 5004 2190 1440 foot-pounds
*** Max. Vertical Reaction 0-4" Strut Stroke
6140 - •» pounds
* See Appendix A for drop test requirements. ♦* Drop made prior to official tests not witnessed by required agencies. *** See Appendix B.
Mtf.... .......^ » ....
lSIlLTR-1 DROP TEST REPORT
K W. LOU) MACHINE WORKS. Ine. KMONA CALVOtMA
Pag* 7
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FIGURE IDROP TEST TOWER
XV5A NOSE LANDING GEAR
15ULTR-1 DROP TEST REPORT Pag« 8
K W. LOUD MACHINE WORKS. Inc.roMONA CAUfOKNU
KIGURE n
REACTION HLATI ORM
10,000 -f VERTICAL REACTION
5,000?- nORI/.ONTAL REACTION
I'illLTR-l DROP TEST REPORT
H. W. LOUD MACHINE WORKS. Inc. POMONA. CALIFORNIA
Page 9
FIGURE HI
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120 R. Typ.
•500 DU. . 501
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13111.116 ORIFICE CONFIGURATION (FULL. SIZE)
7. 50
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. 350
. 348
- . 285 Dla.
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DU.
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Dia.
K 1511L125 METERING PIN CONFIGURATION (HALF SIZE)
1511LTR-1 DROP TEST REPORT Page 10
ISULTR-l DROP TEST REPORT Page 11
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1511LTR-1 DROP TEST REPORT
H. W. LOUD MACHINE WORKS. Inc. POMONA. CALIFORNIA
Appendix A
APPEN DIX A
DROP TEST PROCEDURE 1511L.TP-4, REVISION "A"
TABLE II DROP TEST REQUIREMENTS PAGE 13
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15I1L,TR-1
lbULTP-4
(A)
DROP TEST REPORT Appendix A
DROP TCST PROC^DURt:
H. W. LOUD MACHINE WORKS. Inc POMONA. CAUrORNOA
Page 13
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15ULTR-1 DROP TEST REPORT
H. W. LOUD MACHINE WORKS. Inc. POMONA. CALIFORNIA
Appendix D
APPENDIX B
WIRE CONFIRMING TEST REQUIREMENT DEVIATION
0-
15 1 lLTR-1 DROP TEST REPORT
H. W. LOUD MACHINE WORKS. Inc POMONA. CALIFORNIA
Appendix B
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