Originally posted by wolf IV
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I am pretty sure this flap is needed due to the 'rise' in the last step. In my balsa cat builds it is perfectly flat and I don't have any tunnel flaps on any other cat. I don't mind, it is actually kinda cool. I can control the bow down without having to add a brick to the bow

As for the lake, bring it on! If you are up for a balsa build, I have a set of plans scaled to a super successful ride. its a 24" version of my Miss Geico (the shockerman plans). I can give you the specs if interested.
Further mods, I added a spray rail along the rounded
chine. I noticed that I was getting significant spray vertical from water pulling up the sides.more soon





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