19990019485 · NASA/FAA Tailplane Icing Program Overview

Ice Shape Effects On Lift Coefflciem Section 1, V=6Okts, Be=0.0* -,Inter-cycle IRT Shape v=135 kts, alpha=-2.9 o • LWC---0.5g/m 3, MVD=20_m

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time=15 min, with boot I cycle every 3 minutes Figure 6 Inter-cycle IRT Ice

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Failed Boot IRT ShaDe Figure 10 Ci Summary for all ice shapes • V=135 kts, alpha=-2..9 ° !_ • LWC=0.5g/m 3, MVD--201un Ice Shape Effects On Drag Section 1, V--6Okts, 6e=0.O o T " "__0----4 ° C, time=22 rain '" / q • q [ Figure 7 Failed Boot IRT Ice -o-sAc _, s_l_,, Figure 11 Cd data summary for all ice shapes Ice Shape Effects On Pttching Moment Section 1, V--60kts, Be=-0.0 o , I I t _ Figure 8 NASA Icing Research Tunnel -it--c_ I O BLADE FAN - -90 FI. DIA -7

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Figure _ 2 Cm Summary for all ice shapes _ITL lo _Lr I A _g, l_ i.'t I'res'L sEt,non I qCREEN / I TES'I SECI'ION I _ I ._,.__ BU1LDING WALLS ISFT 1.'_.1F]" - 0 IN Figure 90SU 7'x10' Low Speed Wind Tunnel American Institute of Aeronautics and Astronautics

Ice Shape Effects On Hinge Mome_ Section 1, V=6Okls, 6e=0.0 _

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Figure 13 C=,_Summary for all ice shapes

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Figure 15 Zero-G Pushover Sample, 5F--0, V=I.4Vs

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Figure 14 NASA Icing Research Aircraft with Tail

Flow Probes

Figure 16 Installation of ice cast on tail

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American Institute of Aeronautics and Astronautics

--THS_ _U_ ........ Jl o _o ee 3e 40 so _o 70 _°i Figure 17 Inter-cycle Ice on Tailplane

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Figure 18 Failed Boot Ice on Tailplane = Figure 20 Comparison of TAILSIM to Flight Test Figure 19 S&C Ice on Tailplane for Pushover (Ice=S&C, 8F=20, CT--'0.10) American Institute of Aeronautics aad Astronautics

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1. AGENCY USE ONLY (Leave blank) 2. REPORT DATE 3. REPORT TYPE AND DATES COVERED January 1999 Technical Memorandum 4. TITLE AND SUBTITLE 15. FUNDING NUMBERS NASA/FAA Tailplane Icing Program Overview WU-548-20-23q30 6. AUTHOR(S) Thomas E Ratvasky, Judith Foss Van Zante, and James T. Riley 7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) 8. PERFORMING ORG=ANIZATION REPORT NUMBER National Aeronautics and Space Administration Lewis Research Center E-I1502 Cleveland, Ohio 44135-3191 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSORING/MONITORING AGENCY REPORT NUMBER National Aeronautics and Space Administration NASA TM--1999-208901 Washington, DC 20546-0001 AIAA-99-0370 11. SUPPLEMENTARY NOTES Prepared for the 37th Aerospace Sciences Meeting & Exhibit sponso: ed by the American Institute of Aeronautics and Astronautics, Reno, Nevada, January I 1-14, 1999. Thomas P. Ratvas<y, NASA Lewis Research Center; Judith Foss Van Zantc, Dynacs Engineering Co., Inc.. 2001 Aerospace Parkway, Brook Park, Ohio 44142 (work funded by NASA Contract NAS3-98008); James T. Riley, FAA Technical Center, Atlantic City Airport, New Jersey 08405. Responsible person, Thomas P. Ratvasky, organization code 5840, (216) 433-3905.

12a.

DISTRIBUTION/AVAILABILITY STATEMENT 12b. DISTRIBUTION CODE Unclassified - Unlimited Subject Categories: 08, 03. and 05 Distribution: N)nstandard This publication is available from the NASA Center for AeroSpace Information, q301 ) 621-0390.

13. ABSTRACT (Maximum200 words) The effects of tailplane icing were investigated in a four-year NASA,'FAA Tailplane Icing Program (TIP). This research program was developed to improve the understanding of iced tailplane aeroperformance and aircraft aerodynamics, and to develop design and training aides to help reduce the number of incidents and accidents caused by tailplane icing. To do this, the TIP was constructed with elements that included icing wind tunnel testing, dry-air aerodynamic wind tunnel testing, flight tests, and analytical code development. This paper pro/ides an overview of the entire program demonstrat- ing the interconnectivity of the program elements and reports on cur 'ent accomplishments.

14. SUBJECT TERMS 15. NUMBER OF PAGES Aircraft icing" Stability and control; Tailplane icing: Tailplane perforl mnce 16. PRICE CODE A03 17. SECURITY CLASSIFICATION 18. SECURITY CLASSIFICATION 19. SECU;_IITY CLASSIFICATION 20. LIMITATION OF ABSTRACT OF REPORT OF THIS PAGE OF AE STRACT Unclassified Unclassified Unclassified NSN 7540-01-280-5500 Standard Form 298 (Rev. 2-89) Prescribed by ANSI Std. Z39-18 298-102