The propulsion is the principle which makes it possible a body to be driven in its space environnant.
It calls upon an engine which transforms into driving force the energy provided by the external medium or an engine.
The propulsion can indicate by extension the production of this force, for example " propulsion nucléaire" , which introduces a confusion between part driving and left propulsive.
In the place of " propulsion musculaire" , English uses the expression " human powered" , which is more exact.
Simple: Propulsion tools
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