shapes

Leaving aside the obvious differences between full/shoal/wing/fin keels, I've noticed that the fin keels on the various Ericson models are quite different--some quite swept back, others (like my E30+) more vertical and triangle-shaped. :confused: I know that keel placement and shape may need...

Can someone tell me the difference between a shoal draft and a wing keel on the 1983 E28 Plus? I know that both models have a draft of 4' 0" but if I'm looking at one how can I tell which model it is? Thanks in advance.