It basic glider, used for studens. The Designer had a long line of them in many shapes. But they are calculated for max 70kg pilot. And have rather poor glide ratio. Here you have full list of his constructions. Columns translation ( yours is bro-18): Name, targed/category, year, wingspan, wing area, lengh, empty weight, glide ratio, minum descending ? , minimum descending speed, how many builded, whom build it.