Roy Cross. Lippisch Wien sailplane. High-performance glider. Built 1929 by Gerhard Fiesler Werke. Designed by Alexander Lippisch. Owned and flown by Robert Kronfeld. From a card set called Histroy of Aviation Brooke Bond, 1973. #RoyCross #aviation #AlexanderLippisch #RobertKronfeld #BrookeBond