Ekolot JK 01A Elf
# Ekolot JK 01A Elf

The Ekolot JK 01A Elf is a Polish mid-wing, single-seat motor glider, designed by Jerzy Krawczyk and produced by Ekolot of Krosno. Production has ended, but when it was available it was provided as a complete ready-to-fly aircraft or as a kit for amateur construction. It was superseded in production by the improved Ekolot KR-010 Elf.

## Design and development

The JK 01A Elf was designed by Krawczyk, based on the earlier work of American designer Alex Strojnikun. It features cantilever wings, a single-seat enclosed cockpit under a bubble canopy, fixed landing gear and a single engine in pusher configuration.

The aircraft is made from composites. Its 11.12 m (36.5 ft) span wing has an area of 10.80 $m^2$ (116.3 sq ft), flaperons and provides a glide ratio of 26:1. The standard engine used was a 20 hp (15 kW) JPX D-320 two-stroke, but this engine is no longer available and any small horizontally-opposed engine in the 20 hp (15 kW) range can be used. An engine of this power provides a takeoff run of 150 m (492.1 ft). The propeller used has a folding design to reduce drag and the fuel tank fitted has a volume of 15 litres (3.3 imp gal; 4.0 US gal). The landing gear uses dual, close-set mainwheels and a smaller nosewheel, with no wingtip wheels.

The company provides complete ready-to-fly aircraft and kits which offer the aircraft in various states of completion.

The first flight was made on 8 July 2006. There is no evidence of production beyond 2007/8.

## Specifications (JK 01A Elf)

Data from World Directory of Leisure Aviation 2011-12 and Ekolot

General characteristics

* Crew: one
* Length: 5.65 m (18 ft 6 in)
* Wingspan: 11.12 m (36 ft 6 in)
* Height: 1.92 m (6 ft 4 in)
* Wing area: 10.80 $m^2$ (116.3 sq ft)
* Empty weight: 115 kg (254 lb) including ballistic parachute
* Max takeoff weight: 230 kg (507 lb)
* Fuel capacity: 15 litres (3.3 imp gal; 4.0 US gal)
* Powerplant: 1 × JPX D-330 two cylinder, air-cooled, two stroke aircraft engine, 15 kW (20 hp)
* Propellers: 2-bladed folding composite

Performance

* Maximum speed: 125 km/h (78 mph, 67 kn)
* Cruise speed: 110 km/h (68 mph, 59 kn)
* Stall speed: 42 km/h (26 mph, 23 kn)
* Maximum glide ratio: 26:1
* Rate of climb: 2.5 m/s (490 ft/min)
* Rate of sink: 0.6 m/s (120 ft/min)
* Wing loading: 21.3 $kg/m^2$ (4.4 lb/sq ft)
