what would happen if a slap a 10hp, 100lbs outboard on Hobie 18, on the rear cross member?

Would a 10 power a Hobie 18 much faster than a 2-3? I’m guessing the hull speed of a Hobie 18 is less than 10 mph and after that you’re just wasting fuel. Am I wrong about this? It surely isn’t going to plane.
Hobie 18 does over 15mph with sails, so I figure 10hp would be more than a strong wind. Also figure if its doing 15+mph with wind-power, its also doing that through some waves and wavelets.
 
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