Mind,
It means that the frames (or stations) for a plate or strake are parallel.
Translation for normal folks:
the piece that makes up that portion of the hull is done as a "flat
wrap" without any twist in it.
If I did not give you an answer you understand, I would be happy to try
again. Or, answer another question, if you have one.
I'm here a lot.
Matt Colie
Lifelong Waterman, Licensed Mariner and Pathological Sailor
(with a naval arch degree - too)

Mindprobe wrote:
I've seen the phrase applied to boathulls, especially catamarans.
Seeking edification. Thanks.