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The fibres used for making the fabric are of high tenacity like Jute, Glass Fibre, Kevlar, Polypropylene, Polyamides (Nylon) etc.
This wood and fabric glider was soon supplemented by a Grob G103 Twin II glass fibre two-seater, EGN, again via a loan from Pratelli, and the Ka 7 eventually moved on to another club.
Lemke elected a relatively thick profile developed in 1967 by University of Stuttgart Professor Franz Xavier Wortmann, the FX 67-K-170, which offered the structural economy made possible by a tall spar - an important consideration as glass fibre was still the only affordable reinforcement material - as well as good performance for the time.