I am running a 13p 3 blade on my 50hp, 15/52 custom semi v 36-37mph so I'd say you're right there. I've read every 10hp you should get 5-7mph more on same hull.
I bought a Tinytach for 2 stroke engine I'm running light load 5700 and heavy 5550. Also keep in mind if you drop motor you will lose a little speed.
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