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With a large Stingray hydrofoil fin, my 13' whaler gets on plane at between 8-11 mph depending on sea conditions. And, it does it very smoothly and stays on plane even as I come down from higher speeds. Not so without the foil. I think the benefits are greater because the Honda 45 4 stroke is heavy, also the kicker. I don't worry about top speed because the boat is overpowered anyway.
Hope this helps.
Aloha JimB)