Regarding the SJ article, what does he mean by ‘Symmetrical Rails’? Thanks, Aloha.

The top and bottom of the rails have the same shape.

Would that be 50/50? Meaning apex is in the middle no matter how thick, thin, knifey, eggy? RK

That’s my guess although you could probably push it 10 points on either side of 50/50 and not change the theory.

The guy is obviously on some sort of crusade to change the design terms every surfer is familiar with and start up his own. Jeez bob just say it like you did in 67.