FTAG-E5      New design. Closed transport in a streamlined shape for gliders . Detachable hood total , light weight, small width and depth and low center of gravity easier to deal with this transport considerably . License-built : About 800 units were built .
FTAG-E6      A further development of the project and E5 Transport for E3
FTAG-E7     Contract for glueing experiments ordered by the Reich Air Ministry together with  the TH Darmstadt and     the TH Stuttgart. Hundreds of experiments in metal , foam, and plastic glueing for fuselage and wing skins were conducted as preliminary work for the mass production of large aircraft.