# Diana Sailplanes Diana

The SZD-56 Diana is a 15 metre Class glider originally designed by Bogumił Bereś at PZL-Bielsko. However, PZL Bielsko went bankrupt before it could be put into serial production.
The rights to the design were taken over by a new entity, Diana Sailplanes, which developed the design further into the Diana 2. The Diana 2 first flew on 12 January 2005.
After two years of development, in 2018 a new design using a fuselage from Czech manufacturer KKB and a wing from Diana Sailplanes was introduced for the 18 metre Class called the Diana 3.

## Design and development

The Diana is a single-seat 15-metre class sailplane. It uses a mid-wing cantilever monoplane with a T-tail unit. It has an all composite carbon-aramid-epoxy structure. The spar-less wing has plate airbrakes protruding from the upper surface only with full-span flaperons. The Diana has a retractable main landing gear with a fixed tail wheel.
The wing was designed by Krzysztof Kubrynski using numerical flow simulation methods (computer programs of his design). It uses a profile belonging to the KL-002 family. For fuselage-wing interference minimization reasons, the wing is thinner at the root. Also, the leading and trailing edges do not follow any straight lines, necessitating a production process that depends heavily on CNC technology. The new wing offers considerably better performance at high speeds and better immunity from surface contamination.
The glider also features an unusual side-stick control system to accommodate the pilot in its unusually narrow cockpit. As the maximum possible water ballast that can be carried in the wings is almost 60 kg (130 lb) heavier than the empty weight of the glider, the Diana 2 has a very large range of wing loadings, from 28 to 58 kg/m$^2$ (5.7 to 11.9 lb/ft$^2$).
In October 2016 Diana's IP rights for the design were passed to Polish company AVIONIC, who announces number of changes to increase performance and comfort of the flight, calling the aircraft NG (New Generation). NG includes fixes and improvements for pilot comfort.

## Competition Awards

2005 – Janusz Centka wins the silver medal in 13th European Gliding Championships in Rayskala – Finland
2005 – Janusz Centka wins the silver medal in 30th Open Class Polish Nationals in Leszno – Poland
2005 – Sebastian Kawa wins the gold medal in 1st Gliding Races Championships in Saint Auban – France
2006 – Janusz Centka wins the gold medal in 31st Open Class Polish Nationals in Leszno – Poland
2006 – Janusz Centka wins the gold medal in 29th World Gliding Championships in Eskilstuna – Sweden
2007 – Janusz Centka wins the gold medal in 14th European Gliding Championships in Issoudun – France
2007 – Karol Staryszak wins the silver medal in 14th European Gliding Championships in Issoudun – France
2007 – Tomasz Krok wins the silver medal in 1st Polish 15m Class Championship 2007 Leszno – Poland
2007 – Sebastian Kawa wins the gold medal in 1st Polish 15m Class Championship 2007 Leszno – Poland
2007 – Sebastian Kawa wins the gold medal in 2nd FAI World Grand Prix Gliding at Omarama – New Zealand
2008 – Janusz Centka wins the silver medal in 30th World Gliding Championships in Luesse – Germany
2009 – Thomas Gostner wins the gold medal in Chilean National in Santiago – Chile
2009 – Sebastian Kawa wins the gold medal in 3rd World Air Games in Turin – Italy
2009 – Thomas Gostner wins the gold medal in 15 Italian Nationals – Italy
2009 – Stefano Ghiorzo wins the silver medal in 15 Italian Nationals – Italy
2009 – Lukasz Wojcik wins the silver medal in 15th European Gliding Championships in Nitra – Slovakia
2009 – Sebastian Kawa wins the gold medal in Pribina Cup, Nitra – Slovakia
2009 – Lukasz Wojcik wins the silver medal in Pribina Cup, Nitra – Slovakia
2009 – Sebastian Kawa wins the bronze medal in 7th Andes Open Soaring Championship
2009 – Thomas Gostner wins the gold medal in Campeonato Nacional Chileno in Santiago – Chile
2010 – Sebastian Kawa wins the gold medal in 3rd World Sailplane Grand Prix Final in Santiago – Chile
2010 – Thomas Gostner wins the bronze medal in 3rd World Sailplane Grand Prix Final in Santiago – Chile
2012 – Sebastian Kawa wins the gold medal in 32nd World Gliding Championships in Uvalde – USA
2014 – Sebastian Kawa wins silver medal in 5th World Championship Races Gliding at Sisteron – France
2014 – Sebastian Kawa wins the gold medal in 33rd World Gliding Championships in Leszno – Poland
2016 – Jerzy Zieba wins the silver medal in FAI Sailplane Grand Prix USA in Ionia – USA
2017 – Lukasz Grabowski wins the bronze medal in 34th FAI World Gliding Championships in Benalla – Australia
2017 – Sebastian Kawa wins the gold medal in 34th FAI World Gliding Championships in Benalla – Australia
2017 – Lukasz Grabowski wins the gold medal in 7th Polish 15m Class Championships in Kielce – Poland
2018 – Lukasz Grabowski wins the gold medal in Ostrów Glide, Polish Nationals 15m – Poland
2023 - Sebastion Kawa wins the gold medal in 15 metre 37 World championships, Narromine - Australia

## Variants
### SZD-56-1 Diana 1

    Certified in Poland in 1997 originally, two built by PZL-Bielsko up to 1998, three built by Bogumil Beres from 2001.

### SZD-56-2 Diana 2

    Production variant built by Bogumil Beres and had a certification by EASA awarded in 2015.

### SZD-56-2 Diana 2 NG (New Generation) (15-metre class)

    Production variant built since 2017 after production rights were passed to Polish Company Avionic.

### SZD-56-2 Diana 2 NG – FES (15-metre class)

    Production variant built since 2018 by Avionic with a front-end electric sustaining (FES) engine.

### Diana 3 KKB 18KE – FES (18-metre class)

    Production variant built since 2018 by Avionic with a front-end electric sustaining (FES) engine.

## Specifications (Diana 2)

Data from
General characteristics
* Crew: One
* Capacity: 240 kg (63.4 US gal / 529 lb) of water ballast
* Length: 6.88 m (22 ft 5 in)
* Wingspan: 15.00 m (49 ft 2 in)
* Height: 1.35 m (7 ft 7 in)
* Wing area: 8.16 m$^2$ (88 sq ft)
* Aspect ratio: 27.57
* Empty weight: 182 kg (401 lb)
* Gross weight: 500 kg (1,100 lb)
Performance
* Maximum speed: 270 km/h (170 mph, 150 kn)
* Stall speed: 60 km/h (37.2 mph, 32.3 kn)
* Maximum glide ratio: 50
* Rate of sink: 0.45 m/s (89 ft/min)