The winning model at the 1971 worlds championships, designed and flown by Pavel Dvorak. He used special wing warps, which enabled him to get make high zoom launches in spite of using a conventional straight tow-hook. The design was later kitted by the Czech company IGRA.
| Name: Saper 13 | Alternative name: |
| Plan-ID (S-O L. numbering): B-244 | Owner: LL |
| Designer: Pavel Dvorák | Drawn by: |
| Year designed: 1970 | Wingspan (mm): 2196 |
| Category: Klass A2 | |
| Sources: IGRA | |
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Changed date: 2018-09-06
