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Praga E-1

The CZAL (Aero) factory at Karlin, led by Jaroslav Slechta, developed the XE-1 two-seat helicopter project in 1947, fitted with twin inter-meshing rotors and a 100hp Praga M-197 engine. This led to the XE-II (OK-FYA) which flew on 14 December 1949. It was an open single-seater with a single three-blade main rotor and 75hp Praga D engine.

R.Simpson "Airlife's Helicopter and Rotorcraft", 1998

Praga E-1 EXP, click here to enlarge

A model of this project worked out at Karlin was shown at Brussels in July 1947. It had two intermeshing two-bladed rotors, the hubs of which were very close together.

Also provided was a tricycle landing gear with the rear wheels directly below the twin vertical fins.

P.Lambermont "Helicopters and Autogyros of the World", 1958

Praga E-1, click here to enlarge

Technical data for Praga E-1

Engine: M-107 rated 81kW, rotor diameter: 9.0m, length: 5.92m, height: 3.60m, gross weight: 710kg, empty weight: 490kg, maximum speed: 145km/h, cruising speed: 120km/h, hover ceiling: 400m, service ceiling: 3000m, range: 180km

Alex Fullmer, e-mail, 09.02.2010reply

Are there any plans to be had on this intermeshing bird? I am interested in a double seater such as this if I can find a good set of plans. I really like the CW105F looks but understand the plans are not that good for building.

Do you have any comments ?

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