The aircraft was first flown by Edmundo Weiss on June 20, 1949. Four two-seat examples were built, designated I.Aé.34 Clen Antú, followed by two single-seat aircraft, designated I.Aé.34 M Clen Antú. In 1953 the first of five side-by-side two-seaters was flown, designated I.A.41 Urubú (Owl).
These three types are also known by their Horten designations: Ho XVa, Ho XVb, and Ho XVc respectively.
The following data relate to the I.Aé.34.
Span: 59 ft 0.7 in (18.00 m)
Length overall: 14 ft 5.2 in (4.40 m)
Length fuselage: 11 ft 5.8 in (3.50 m)
Wing area: 204.5 sq.ft (19.00 sq.m)
Empty weight: 605 lb (275 kg)
Loaded weight: 1,045 lb (475 kg)
Wing loading: 5.1 lb/sq.ft (25 kg/sq.m)
Glide angle: 1:28.5 at 46.5 mls (75 kmh)
Landing speed: 31 mph (50 kmh)