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about engines, to swing a 9 feet prop, you need a big engine. Oberursel and Mercedes had 15 liters ! A 145 Warner is the only realistic engine. A Dr1 only flys like a Dr1 with a 9 feet prop.
The last 30 years people start building 110 Le Rhones. But I still cann not see any engine or parts. For example Auburn valves and ball bearings....................
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