PIK-3c
| PIK-3c | |
|---|---|
| Type: | Glider |
| Design country: | |
| Manufacturer: |
PIK / SIL |
| First flight: |
May 20, 1958 |
| Number of pieces: |
40 (+5) |
The PIK-3c Kajava is a single-seat glider from the student association PIK , which the Finnish Aviation Association Suomen Ilmailuliitto (SIL) produced in series. The first flight of the kajava (seagull) took place in 1958. The machine has proven itself excellently in international competitions. Forty copies were built and were used in many Finnish clubs.
history
Pre-series
The PIK-3 was developed by students at the Helsinki University of Technology . The first drafts began in 1942, but the construction had to be postponed due to the war. The school machine PIK-5 and the school glider PIK-7 Harakka flew for the first time in 1946 and 1947 and were produced in large numbers.
The draft of the PIK-3 (originally LHN-3 ) was completed in 1947 by Lars Norrmén as a diploma thesis . The prototype of a small performance aircraft for clubs (pieni kerho-tehokone) with a wingspan of 13 meters came into flight in 1950. Antti Koskinen revised the design as PIK-3a Kanttikolmonen for series production.
Small series PIK-3b
In the PIK-3b variant , Koskinen replaced the airbrakes with air brakes and moved the raised wing down a little. This version was built three times at PIK.
PIK-3c kajava
After the OSTIV had redefined the competition classes , the association stopped developing the PIK-14 performance aircraft. Under the direction of Olavi Roininen, Urpo Pikkarainen and Tuomo Tervo designed a largely new standard class aircraft with a wingspan of 15 meters in 1957. They used the shortened wings of Koskinen's PIK-13 as the wing.
The prototype made its maiden flight on May 20, 1958. In the same year he came second in the standard class at the World Gliding Championships in Leszno . The series machines received by Suomen Ilmailuliitto the name Kajava , was named after the Kittiwake . 40 of the PIK-3c were built.
construction
The PIK-3c is made entirely of wood, the nose of the fuselage is planked with plywood . Compared to the PIK-3a, the design including the fuselage and tail unit has been completely revised. The wing area remained about the same with increased wingspan. "Göttingen 549" instead of "Göttingen 693" from the Göttingen Aerodynamic Research Institute was used as the wing profile . The machine is a single-seat, self-supporting shoulder-wing wing, with a cross-shaped tailplane . There is a sprung runner in front of the permanently installed wheel.
A comparable glider is the German Ka 6 .
Technical specifications
| Parameter | PIK-3c |
|---|---|
| constructor | Roinines, pickarains, tervo |
| class | Standard (later Club) |
| Seats | 1 |
| design type | Wooden construction |
| Wing profile | Goettingen 549 |
| span | 15.00 m |
| Wing loading | 21.4 kg / m² |
| Wing area | 13.1 m² |
| Wing extension | 17.2 |
| Glide ratio | 30 at 75 km / h |
| Slightest sinking | 0.61 m / s at 65 km / h |
| length | 6.60 m |
| Top speed | 235 km / h |
| Water ballast | none |
| Preparation mass | 165 kg |
| Max. Takeoff mass | 280 kg |
Preserved copies
A publicly exhibited copy of the PIK-3a has been in the Finnish Aviation Museum in Vantaa since 1978 .
literature
- BS Shenstone, KG Wilkinson, Peter Brooks: The World's Sailplanes. The gliders in the world. Les Planeurs in Le Monde . OSTIV, Zurich 1958. pp. 9-13. (trilingual)
Web links
- PIK : PIK-sarjan lentokoneet (type overview, Finnish)
Individual evidence
- ^ Andrew Coates: Jane's World Sailplanes and Motor Gliders . London 1978. p. 24.