In this glider the is a built-in motor which makes this glider start itself so without drag plane or winch.
For that engine is fuel needed, of course, and normally these are rubber tanks which are in the wings.
The rubber tanks, however, broke down and the owner wanted a different solution in Aluminium.
For his own aircraft, he needed 2 tanks, another goes to a company that will review this and hopefully approves this for inside the aircraft.
If it does, the client wants to sell the tanks. All these planes have the same problem with the original leaking tanks.
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