[1][2][3] The TST-7 Junior was a development of the TST-1 Alpine self-launching sailplane, with a design goal of producing an aircraft more suited for use as a touring motor glider with docile handling.
The 12.6 m (41.3 ft) span, shoulder-mounted, slightly forward-swept wing employs a Wortmann FX 61-184 airfoil and has top-surface air brakes.
[1][2][4] The aircraft was supplied as a standard kit rated at 400 hours for completion and that did not include the powerplant.
The factory also built some TST-7s as ready-to-fly models that were US$16,250 in 1998 with the M 125 engine and US$17,540 in 2000 with the Rotax powerplant.
[1][2][3] Data from Purdy and Kitplanes[1][2]General characteristics Performance