On a soft bottom inflatable 2.4mtr (typical size) a 5hp will be overkill and just fold it up.
As long as you don't have any significant current a 2.2 - 3.3 up will be enough.
NB we have a RIB alloy bottom and 1 up the 3.3hp up will give 10knots but 2-4 people and you don't have enough power to plan, and any speed over 4-5 knots just makes everyone wet so you are almost never over 1/3- 1/2 revs.
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