RIBs are pretty light, though, and have little draft. My boat is heavier than a RIB, and draws quite a bit more water. It also has a cuddy cabin and a cockpit under canvas, where one can get out of the wind and rain!
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It all depends on how fast and how far you want to go.
So, how fast does your 30HP Zodiac go with 4 divers + doubles? Should I break out the high-speed camera or a radar gun? Or should I though a lines off the stern with knots tied every so often and count like in the old sailing days?
That was my point. What are you doing and where are you going that requires 50hp per diver?
The Zodiac is not blistering along at 500kts but with four divers we plane without a hitch and get to our destination in a reasonable amount of time.
The posts on this thread are reading like "if ou don't have 200hp forgetabboutit!" Which I was pointing out is not the case.
You really should follow the three F's rule.
If it floats, flys, or f _ _ ks, ............... rent it!