Wind tunnel test of a variable-diameter tiltrotor (VDTR) model

APPENDIX A

Conditions

Test

Model

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APPENDIX B

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APPENDIX c

L

Rotor Thrust Parameters

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m . '_ _ _ _ m',- _ cu/ I /-- /o_/m/_/m/m/t_lol,- m/mlO_lmlml,-Io_ o ,-.,-I_lo/olololo E "e _ O) (._ ¢_I ,,t ,_I" Ol I _ O (D I',,- P,- _I" ,_, O) U') o ,,- ,.- _0 0,_ o,I _ _! i J_" l_ol_ol_l_Jo_l,.,J_J,.. "-lmlm _ _'-l_l_ _ + _l'l-'-JOlOl_l_le_ •- ,- _ o_ 0 o_ + _ m l _'_ _ _ m _ _ cO _I" _ , _lOl_'l--l_l'l_le_ ,- _ _l_l,"l,'-lOlO_le_

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OlOlO.IOlOlOlO o o OlOi,-i-i_i,.-i,-

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!+ _ _ +0 o,o ++.+., ,, ,_ I_. ® o+1o --I_1,+1.,I,_1,+ ,- ®!++ ol.-I_. ,.,6,1., ,+ ® o, ol.-I_1+,., ,, ........... / "r "tim mlmlmlmlml m "_ '_ m +1m coT/m + co _0 r,-ir-.l_-.ir,- P, _,.

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.APPENDIX D

Shaft and Wind Axis Load_

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APPENDIX _.

Balance Loads

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APPENDIX F

Hub

Fixed

Balance

Load_

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APPENDIX G

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APPENDIX R

Accelerometer

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APPENDIX I

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.APPENDIX j

Blade Flatwise Loads

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APPEND IX

Blade Edgewise Loads

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Blade Torsional Loa_

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APPENDIX M

Pushrod Loads

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_APPENDIX N

WITNESS System

Steady-State Data

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II I I

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APPENDIX 0

Calculated Parameters

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REPORT DOCUMENTATION PAGE OUeNo. o7o.o188

data imurces, to liver.age 1 hour ......... on. Send comments regarding this burden eetirn_e _r any othar MI_. of _ ts " D"_II Highway, Suite 1204, Arllr_ton, VA 22202-43G2, and to the umce ol .M.,av AGENCY USE ONLY (Leave blank) 2. REPORT DATE 3. REPORT TYPE AND DATES COVERED

January 1994 Contractor Report

5. FUNDING NUMBERS TITLE AND SUBTITLE

Wind Tunnel Test of a Variable-Diameter Tiltrotor (VDTR) Model

NAS2-13484

AUTHOR(S)

David Matuska, Allen Dale, and Peter Lorber

PERFORMING ORGANIZATION REPORT NUMBER

PERFORMING ORGANIZATION NAME(S) ANDADDRESS(ES)

United Technologies Corp.

A-94018

Sikorsky Aircraft Division

6900 Main Street

Stratford, CT 06601-1381

SPONSORING/MONITORING AGENCY REPORT NUMBER 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)

National Aeronautics and Space Administration

NASA CR-177629

Washington, DC 20546-0001

SUPPLEMENTARY NOTES Point of Contact: Karen Studebaker, Ames Research Center, MS 237-5, Moffett Field, CA 94035-1000

(415) 604-4682

DISTRIBUTION CODE 12a. DISTRIBUTION/AVAILABILITY STATEMENT

Unclassified-Limited Distribution

Subject Category - 05

ABS__TF_ACT (M.xlm. um 200 wordS.)

Tills report aocuments tlae results from a wind tunnel test of a 1/6th scale Variable Diameter Tiltrotor (VDTR). This test was a joint effort of NASA Ames and Sikorsky Aircraft. The objective was to evaluate the aeroelastic and performance characteristics of the VDTR in conversion, hover, and cruise. The rotor diameter and nacelle angle of the model were remotely changed to represent tiltrotor operating conditions. Data is presented showing the propulsive force required in conversion, blade loads, angle of attack stability and simulated gust response, and hover and cruise performance. This test represents the first wind tunnel test of a variable diameter rotor applied to a tiltrotor concept. The results confirm some of the potential advantages of the VDTR and establish the variable diameter rotor a viable candidate for an advanced tiltrotor.

This wind tunnel test successfully demonstrated the feasibility of the Variable Diameter rotor for tiltrotor aircraft. A wide range of test points were taken in hover, conversion, and cruise modes. The concept was shown to have a number of advantages over conventional tiltrotors such as reduced hover downwash with lower disk loading and significantly reduced longitudinal gust reponse in cruise.

In the conversion regime, a high propulsive force was demonstrated for sustained flight with acceptable blade loads. The VDTR demonstrated excellent gust response capabilities. The horizontal gust response correlated well with predictions revealing half the response to turbulence of the conventional civil tiltrotor.

lS. NUMBER OF PAGES SUBJECT TERMS CODE

Variable-diameter, Tiltrotor, Wind tunnel test

A13

20. LIMITATION OF ABSTRACT RITY CLASSIFICATION ECURITY CLASSIFICATION OF ABSTRACT OF THIS PAGE OF REPORT

Unclassified

Unclassified

Standard Form 298 (Rev. 2-89) presctibld by ANSI Std. Z39-18 NSN 7540-01-280-5500 29e.lO2