Enojezični primeri (nepregledani od uredništva PONS)
angleščina
In a bid for increased efficiency with speed, a development of the "turbofan" and "turboprop" known as a propfan engine was created that had an unducted fan.
One of the ideas that has been tried in the past and continues to be an idea mentioned with efficient airliners of the future is the unducted fan, or propfan.