Assertion: fiberglass centerboard | /r/HasAspect | shallow draft
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Source sentences:
text: There was a shallow keel that contained all of the ballast in the boat ,and then a fiberglass centerboard was housed inside the keel to allow more resistance to leeway and better directional stability (ability to steer) when the CB is lowered, yet still have shallow draft with it raised and some directional control due to the keel.