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Qhristmas Is for Giving Qhristmas is for giving... 1 GOOP-OFF. Amazing spray dissolves 7LADIES PINS. Exquisite hand-made SAXTON SKY SPY VHF RECEIVER, Pen tape residue and other stains in sec­ solid gold pins, with safety catch. A per­ Size, put in your pocket and monitor onds! large 1 lb. 8 oz. spray can $8.50 fect gift for Christmas, Birthday or Anni­ weather and communications .. $18.95 Postage and packing ............ $1.00 versary. State sailplane desired and re­ LUFFT AUTO ALTIMETER. Compen­ 2 WING STANDS. Super-lightweight, alu­ quest price. sated, 0- 12,000 ft. With this instrument minum, adjustable, strong, anti-slip 8 RAINCO MARK V VENTURI. High accu­ your crew can advise the local terrain padded, stable, folding, custom wing racy compensation with lowest drag. elevation. With universal swivel mount stands, manufactured in our shop. Complete with instructions and tubing. for windshield or dash ......... $35.00 Weighs only 4V2 Ibs., supports 200 Ibs! 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BUSINESS MEMBER � ., THE JOURNAL OF THE SOARING SOCIETY OF AM ERICA The Soaring Society of America is a division of the National Aero­ nautic Association (NAA) , which is the official U.S. re presentative of the Fed eration Internationale Aeronautique (FAI, the world gov­ erning body for sport aviation ). The NAA, which represents the U.S. at FAI meetings, has delegated to the SSA supervision of FAI-related soaring activities such as record attempts, competition sanctions, issuance of FAI Badges, and selection of a U.S. team for the World Soaring Championships. SOARING is the Society's official journal. VOLUME 37 DECEMBER 1972 NUMBER 12 CONTENTS 16 THE O&ROGRAPHIC RECORD, Bennett Rogers 22 MIDDLE AMERICA SOARING, Erica Scurr 26 SOARABILITY - THE PERFORMANCE RATIO, Larry Linville and Dennis Harmon 28 LAP RACING, Bill Snead 30 SOARING AND YOUTH - WHY NOT?, Holly Weimer 33 ALTITUDE INDOCTRINATION, Bill Allen 34 THE MOJAVE CAVE PETROGLYPHS, Earl Seagars 36 LEARNING TO THERMAL ON THE GROUND, Lawrence Gehrlein 37 THE LADY MARIE, Vic Saudek FEATURES 2 LETT ERS TO TH E EDITOR 8 SSA IN ACTION 38 SAFETY CORNER, St. Horvath 39 FAI. BADGES (U.S.) , Delta Rathbone 40 LONG FLIG HTS, Delta Rathbone 40 RECORDS APPROVED, Bill Allen : 41 CALENDAR OF EVENTS, Bill Allen 42 FREE IT EMS FRO M SSA 42 CLASSIFIED ADVERTISING SSA Officers: President, Miles Coverdale; Vice-President, Marion S. Griffith, Jr.; Vice-President, John W. Williams; Secretary, Lewis W. Hull; Treasurer, T. E. Sh arp; Executive Director, Lloyd Licher Staff: Doug Lamont, Editor; Nikki Deal, Art Director; Lianna Lamont, Editorial Assistant; George Uveges, Contributing Photographer Cover: Silent night, silent flight. Wendy Hodnet's photo evokes the spirit of the season. Total paid circulation of the November issue was 14,800 DECEMBER 1972 • - -=-rrF� " Q� \ to the editor Slope Soaring on Clouds? is available in many other parts of the Night Rotor Cloud country to soaring pilots who can interpret Dear Sir: It's Being Done what they see. The most common form of Dear Sir: I am a member of the Nevada Soaring this is the formation of mountain-type cap Association and the newly-formed Air I would like to comment further on the clouds on the upwind face and over the Sailing group. The photographs enclosed discussions of slope or wave soaring in tops of towering cu's. The Wenatchee were taken from my office, which is al­ front of cumulus clouds, particularly on phenomenon occurs at too Iow an altitude most downtown Reno, at approximately Ed Gardyan's letter in the October issue. for a cap cloud to form. 11:30 p.m. during the early part of Octo­ From personal experience I can say that ber. The sequence of pictures were taken such soaring can definitely be done. It This phenomena exists because of the at 8-10 minute intervals. The wave and has been a fairly common practice for tendency of two air masses of different roll clouds were over the Mt. Rose area. years at Wenatchee, Washington. temperatures not to mix when brought into ROBERT N. MCG When conditions are right, a cool stable contact with one another. Perhaps the EHEE Reno, Nevada wind comes down Birch Mountain on the best laboratory example can be found west side of the Columbia river, is de­ right at home in the form of a bubble flected upward by the cliffs on the east lamp. While a freshly-formed warm bub­ side, and rides over a stationary orographic ble that is rising may bump into a cooler cumulus formed above the cliff by slope bubble that is coming down, the one that winds from the valley floor. is larger or has the greatest momentum Visible evidence of such upslope winds, will deflect the other-the two will not pretty much as described by Mr. Gardyan, burst on impact and blend. Only when the lamp has been switched off and the temperatures of the bubbles are nearly Material published in SOARING Magazine is equalized will two bubbles bump and contributed by individuals for the reading pleasure of soaring enthusiasts. Monetary merge. payment ($25) is only made for the photo­ graph that is used on the front cover. It's the same in the atmosphere - Anyone is invited to contribute articles, smooth-flowing stable air will not pen­ reports, and photos concerning soaring ac­ tivities. However, any material that is to etrate or break up an active cu that gets be returned must be accompanied by a in its way; it will be deflected over or stamped self-addressed return envelope. around the cu. Manuscripts accepted for publication are M. subject to whatever deletions, additions, or PETER BOWERS revisions are necessary to adapt the ma­ Seattle, Washington terial to the space requirements and quality standards of the magazine. Reproduction of any of the enclosed material, unless specifi­ Dear Sir: cally excluded, is encouraged. All reprints In reference to Ed Gardyan's letter must credit the Soaring Society of America. SOARING Magazine is the publication of (Soaring, October 1972) describing wave the Soaring Society of America, Inc., edi­ clouds above cumulonimbus near Boston: torial and business office: 3200 Airport Ave., Yes, there are records and studies of such Room 25 , Santa Monica, Calif. 90405 (mail­ ing address: P.O. Box 66071, Los Angeles, happenings. The strong updraft can ap­ Calif. 90066). Telephone (2 13 ) 390 -4449. parently deflect the upper-air streamlines, SOARING is published monthly. Second-class similarly to the way streams are pushed postage paid at Santa Monica, California, around in fluidic control devices. and at additional mailing offices. Subscrip­ tion to individuals in the United States Photographs of such phenomena can be available only as a part of SSA membership. Membership is open to anyone interested in found in some basic meteorology and the art ' the SCience, or the sport of motor­ cloud study books. I have before me page less flight. Annual dues: Membership, $15; 29 of Cloud Study, A Pictorial Guide, Family Member (Member status, less sub­ Ludlam and R. S. Scorer (Murray, scription, for any person in same family and F. H. household of a voting member), $5; Asso­ London, 1957), where the waves are ciate, $9; Student Member (must be en­ classed as a kind of pileus, the cap that rolled full-time in an academic school dur­ forms when a cumulus pushes the over­ ing normal school year, give name of school and be aged 22 or under), $7; lying air above its condensation level.
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