Your OS21 will run almost 50 mph better set it at 8 1/4 and hold on.........i have vs1 tunnel hull with o.s.21xm. would like to know the best balance point on the boat. in the directions it says 7.5" to 8.6" from back of sponsons.anyone tell me best spot for balance?that 1 inch makes big differnce for weight.
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