From 'Aeroplane Monthly' January 2024, page 77. An image of the Sparmann S.4 wind tunnel model (or the 'E.4' as they call it), and a brief description.
https://sv.wikipedia.org/wiki/Sparmann_E4 - Swedish Wikipedia report there were two options of armaments: 4 gun of 8 mm and 2 gun with 12,7mm and 8 mm. The Speed was 400 km/h with Twin Wasp Junior or 375-390 Km/h with Bristol Mercury .
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