Nice, I am only amazed by this paragraph.
"Argentina is one the smallest South American countries to have an aircraft industrie"
At the time of the printing of those books (1960s) there was only two South american countries manufacturing aircraft, Brazil and Argentina, so no much to choose between smallest or bigger.
And the word "small" applied to a country with near 3 million square kilometers...
, crazy.
Aniway.
IA-41: 
Reimar Horten design.
The desire for a training sailplane with side-by-side seating had been expressed by several soaring clubs. This led to the production of four I. Ae. 41 aircraft. These 18 meter machines, benefited from all our previously hard earned experience, were without faults and very simple to fly. A tandem undercarriage with extra soft suspension, made landings easy. They were stable and behaved well in turbulent air, in contrast to their predecessors, which would tip stall under similar conditions.
Heinz Scheidhauer, who had followed me to Argentina, made soaring history on October 30th, 1956, when he became the first person to cross the Andes in a sailplane. To start he flew the I. Ae. 41 from Cordoba to Bariloche, a distance of over 1,000 km in aerotow!
The Ho XVc in Europe
Four aircraft somewhat similar to the I. Ae. 41 were built in Germany in the fifties. One was completed in Türbingen, another in Pappenheim. The third remained uncovered in a hanger at Klippeneck for ten years, before it was completed by an "Old-timer" in Günzburg. There whereabouts of the fourth, built in Mannheim, is unknown.
More pictures here.
The Horten IA-41 URUBU (Ho XVc)
Linear Mode
