The original model was designed and built by Hans Schmiterlöw during the winter 1940. It was equipped with a geared propeller driven by three separate rubber motors, using a commercially available "Hawker Hart" gear box. In addition, it had a retractable landing gear and a foldable propeller.
In 1941, the design was modified for the new Swedish M1 class. The gear drive was dropped, the wing was placed above the fuselage on a cabane, among other changes. A plan was drawn for the magazine "Teknik för Alla", but was never publised.
| Name: Hopus Hart | Alternative name: |
| Plan-ID (S-O L. numbering): A-000 | Owner: SMOS |
| Designer: Hans Schmiterlöw | Drawn by: Hans Schmiterlöw |
| Year designed: 1940 | Wingspan (mm): 750 |
| Category: Klass B | |
| Sources: Hans Schmiterlöw, Oldtimer 3/1988 | |
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Changed date: 2019-03-09
