wiki says
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The Stipa-Caproni proved to be noticeably quieter than conventional aircraft of the time. Unfortunately, the "intubed propeller" design also induced so much aerodynamic drag that the benefits in engine efficiency were cancelled out, and the aircraft's top speed proved to be only 131 km/h (81 mph).[4]
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aer·o·dy·nam·ics: the science of passing gass
*i can coast for miles and miles and miles*
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