INTA HM.1
An HM. 1 at the Museo del Aire, Cuatro Vientos, Madrid.
Role	Primary trainer Type of aircraft
National origin	Spain
Manufacturer	Aeronáutica Industrial S.A.
Designer	Pedro Huarte-Mendicoa
First flight	1943
Number built	200

The INTA HM.1, also known as Huarte Mendicoa HM-1, was a 1940s Spanish primary trainer designed by the Instituto Nacional de Técnica Aeronáutica (INTA) and built for them by Aeronáutica Industrial S.A. (AISA).^[1]

Development

The HM.1 was designed by INTA as a two-seat primary training monoplane with a fixed tailwheel landing gear.^[1] It was followed by a number of similar aircraft with equipment and accommodation changes.^[1] The last of the family was the HM.7 built in 1947 which was an enlarged four-seat version powered by a 240 hp (179 kW) Argus As 10C engine, the HM.7 was the last powered aircraft designed by the Institute.^[1]

Variants

HM.1

Two-seat primary trainer

HM.2

enclosed-cabin version of the HM.1 with retractable landing gear.

HM.3

open-cockpit floatplane variant

HM.5

single-seat advanced trainer

HM.7

enlarged four-seat version

HM.9

two-seat glider tug

Operators

 Spain

• Spanish Air Force

Specification HM.1

Data from Jane's Fighting Aircraft of World War II^[2]

General characteristics

• Crew: 2
• Length: 7.65 m (25 ft 0 in)
• Wingspan: 9.65 m (31 ft 8 in)
• Height: 2.20 m (7 ft 2.25 in)
• Wing area: 14 m² (150.6 sq ft)
• Empty weight: 620 kg (1,364 lb)
• Gross weight: 850 kg (1,870 lb)
• Powerplant: 1 × Elizalde G-IV-B Tigre 4-cylinder four-cylinder linear motor , 110 kW (150 hp)

Performance

• Maximum speed: 230 km/h (142.8 mph, 124.1 kn)
• Cruise speed: 195 km/h (121 mph, 105 kn)
• Endurance: 3 hours 30 minutes
• Service ceiling: 5,000 m (16,400 ft)