A nameless model by Sven-Olof Ridder, described in "Hobbyboken 1947-48". The model had a wandering flight pattern and a phenomenal ability to find lift.
| Name: Ridder S1 | Alternative name: |
| Plan-ID (S-O L. numbering): | Owner: |
| Designer: Sven-Olof Ridder | Drawn by: |
| Year designed: 1947 | Wingspan (mm): 995 |
| Category: Klass S1 | |
| Sources: Hobbyboken 1947/48, Oldtimer 1/1996 | |
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Changed date: 2015-08-21
