Correct answer is... 2018 kg. It is equal to 4450 lbs. Empty weight of Cunliffe-Owen Concordia is total weight of the airframe, engine, avionics and all other systems installed by manufacturer. It is higher weight then empty speed of other aircrafts of a similar size. Average is about 1844 kg (4066 lbs).
The biggest civil aircraft has empty weight of 250,000 kg (628,000 lb), so Cunliffe-Owen Concordia has 1% percent of it's weight. Typical jet airliner has about 39,500 kg (87,100 lb), so in the comparision Cunliffe-Owen Concordia has 5% of aircrafts like B737 or A320.
Disclaimer: Our articles and data connected to empty weight of Cunliffe-Owen Concordia are based on public data from various sources. We are very picky to select an reliable data providers, but we cannot guarantee that everything is 100% error-proof. We recommend for any serious purpose - as a rule of thumb - to request offical data about empty weight from manufacturer of Cunliffe-Owen Concordia.