configuration shown in fig1 when it is desired to drop the propulsion unit into the water the motor is lifted up by hand pivoting coupling unit upward 30 u and propeller downward in direction 30 d when the coupling unit is full pivoted the striker 30 s engages in the catch in the configuration shown in fig1 while steerable propulsion unit 60 s is shown either propulsion unit 60 or rotating propulsion unit 60 r can be used interchangeably with the tiltable coupling unit 30 t the propulsion unit includes a plug that can be axially plugged and removed from a socket located within tiltable coupling unit 30 t in other words the plug and socket concept is present in all embodiments whether straight drive steerable drive or rotating drive the socket may be fixed or pivotable the motor may be mounted on a boat deck on the coupling unit or other suitable location having described preferred embodiments for which are intended to be illustrative and not limiting it is noted that modifications and variations can be made by persons skilled in the art in light of the above teachings it should be understood that propulsion assembly can take many varied forms and is not limited to the specific embodiment shown and described while a latter and electric motor are shown it should be understood that other power sources can be employed within the scope of the invention it is therefore to be understood that changes may be made in the particular embodiments of the invention disclosed which are within the scope and spirit of the invention as outlined by the appended claims having thus.