Engineering:Sanstroem Friendship 3
| Friendship F3 | |
|---|---|
| |
| A first production Friendship F3 | |
| Role | Ultralight aircraft |
| National origin | France |
| Manufacturer | Friendship Legend (R,S & Associes SAS Erik Sanstroem)[1] |
| First flight | July 2012 |
| Introduction | 2012 |
| Status | Production completed |
| Number built | one |
The Friendship 3 is a French ultralight aircraft with tandem seats, engineered in France and Switzerland, and assembled in Czech Republic by Ivanov Aircraft for the manufacturer, R,S & Associes SAS Erik Sanstroem of Versailles, Yvelines. Inspired by 1950s and 1960s light aircraft and motorgliders, the Friendship 3 is a two-place tandem-seat ultralight aircraft with dual controls, so that the rear seated passenger can also fly.[1]
The company seems to have been founded 2012 and gone out of business in 2014.[2]
Design and development
The Friendship 3 was designed for both soaring and cross-country powered flying, with a glide ratio of 24:1. The Friendship F3A has a composite fuselage; and wood and fabric for the wings with the main spars in carbon fiber. The aircraft was registered in France in late 2012.[1][3]
Variants
- Friendship 3
- F3A: Available with 80 hp Rotax 912 engine.
- F3B: Available with 100 hp Rotax 912 engine.
Specifications (Friendship F3A)
Data from Tacke[1]
General characteristics
- Crew: one
- Capacity: one passenger
- Wingspan: 11.47 m (37 ft 8 in)
- Wing area: 11.89 m2 (128.0 sq ft)
- Empty weight: 292 kg (644 lb)
- Gross weight: 472.5 kg (1,042 lb)
- Fuel capacity: 70 litres (15 imp gal; 18 US gal)
- Powerplant: 1 × Rotax 912UL four cylinder, liquid and air-cooled, four stroke aircraft engine, 60 kW (80 hp)
- Propellers: 2-bladed composite
Performance
- Maximum speed: 235 km/h (146 mph, 127 kn)
- Cruise speed: 200 km/h (120 mph, 110 kn)
- Stall speed: 60 km/h (37 mph, 32 kn)
- Maximum glide ratio: 24:1
- Wing loading: 39.7 kg/m2 (8.1 lb/sq ft)
References
- ↑ 1.0 1.1 1.2 1.3 Tacke, Willi; Marino Boric; et al: World Directory of Light Aviation 2015-16, page 75. Flying Pages Europe SARL, 2015. ISSN 1368-485X
- ↑ "Internet Archive Wayback Machine". archive.org.
- ↑ Tisserant, Philippe (December 2012). "Friendship 3 Retour du RF3 en ULM biplace". Vol Moteur (322): 22–27. ISSN 0299-8203. http://www.vol-moteur.fr/index.php?id=502. Retrieved 3 April 2014.
External links
- Official website
- Vol Moteur Magazine Flying Test of Friendship F3
- Volo Sportivo VS 28 Impressioni di volo Friendship F3
 |  |
