Motorlet M-701
# Motorlet M-701

The Motorlet M-701 is a Czechoslovak jet engine. It was used to power the Aero L-29 Delfín jet trainer, with about 9,250 engines built between 1961 and 1989.

## Development and design

In 1955, the Czechoslovakian aero-engine company Motorlet commenced design of a new turbojet engine to power the Aero L-29, a jet trainer being designed by Aero for a competition to equip all Warsaw Pact air forces. The resulting design, designated Motorlet M-701 was a single-shaft centrifugal-compressor turbojet and was the first jet engine designed in Czechoslovakia (although Motorlet had previously built the Klimov VK-1 under license).

The M-701 was first run in 1958, and engine no. 4 was tested on an Avia B-228 flying laboratory in December 1959. Engine no. 8 powered the third prototype L-29 when it flew on 12 July 1960 (the first two prototypes had flown the previous year powered by Rolls-Royce Viper engines). The L-29 was selected as the winner of the competition and was ordered in large numbers, with the M-701 entering production at Jinonice near Prague in 1961. By the time production ended in 1989, more than 9,250 had been built.

## Applications

* Aero L-29 Delfín

## Specifications

Data from Jane's All the World's Aircraft 1971-72.

**General characteristics**

* Type: Single shaft centrifugal flow turbojet engine
* Length: 2,067 mm (81.38 in)
* Diameter: 896 mm (35.28 in) (max. width) × 928 mm (36.53 in) (max. height)
* Dry weight: 330 kg (728 lb)

**Components**

* Compressor: Single-stage centrifugal
* Combustors: 7 straight-flow combustion chambers
* Turbine: Single-stage axial-flow with 61 blades

**Performance**

* Maximum thrust: 8.75 kN (1,962 lbf) (Take-off power: 15,500 rpm), 7.87 kN (1,764 lbf) (Rated power: 14,950 rpm)
* Overall pressure ratio: 4.3 : 1
* Air mass flow: 19.6 kg/s (37.25 lb/s)
* Specific fuel consumption: 1.14 lb/(lbf⋅h) (at rated power)
* Thrust-to-weight ratio: 2.7
