ALEXIS DROUTZKOY Editor M. COSGROVE R. M. YOUNG Associates EUGENE SCHILLINGER Advertising Director SERGEI SIKORSKY Art Director D. M. MANUEL Circulation Director FANCHON DEVOE West coast Associate HENRI A. DE VILLERMONT L. DE GOUVION ST. CYR European Associates MAY 1946 VOLUME 2 . NUMBER 6 MAGAZINE OF ROTARY WINGS - AVIATION - AIRWAYS COVER SIKORSKY DONS CIVVIES-Sikorsky S-51 now fully licensed by the CAA, the first four-place helicopter certificated. FEATURES THE HELICOPTER TODAY - by Lou Leavitt 8 NAZI AIRCRAFT UNEARTHED - by Birt Darling 11 ARMY'S XR-9B 13 NAVIGATIONAL ASPECTS - by J.l. Mitchell... 14 HELICOPTER INSTRUMENTS - by Donald Jensen 15 BROOKLYN AIR RAIL BUS TERMINAL -by Daniel Hawthorne Ecker 16 HELICOPTER RESEARCH - by Grover Loening 18 A REPLY TO MR. LOENING - by C. "Les" Morris 19 JET FOR ROTARY WINGS - Power Plant Laboratory, Wright Field 24 R-5 SHEDS OLIVE DRAB 25 FROST CONTROl - by Dick Jarrell 26 AERIAL PHOTOGRAPHY - by Jack Hamilton 27 REPORT ON THE FORUM - by John Fox 28 BRISTOl WAYFARER & FREIGHTER 31 CONTRAPTIONS TO 'COPTERS - by Frank T. Coffyn 32 FLYING BOXCAR - by George Wales 35 I SOLOED ON AN E-RIDE - Margaret E. Moore 36 WELKIN HIGH ALTITUDE FIGHTER - by M. Berry 39 AIRCRAFT SPEED INDICATORS - by David Stewart 40 PICTORIAL ON THE lINE 20 DEPARTMENTS LETTERS TO THE EDITOR 3 NEWS VIEWS AIMS 6 PHOTO CREDITS 46 BOOKS 48