Is there a convention on what the bottom contour of an egg should be? On my GH 2+1 egg, it's a bit of rolled entry, flat through midboard until tail, then very slight vee out the tail (picture doesn't capture the vee, gotta measure it to notice) However, looking at this thread https://jamboards.com/threads/tell-me-all-about-magic-models.606/page-9#post-122039 the above may not be the conventional design. The nose of the board has a 50/50 rail & displacement entry. Mid-board has an uprail & single concave, great for laying it on rail, as was said above. Hard edge down rail in tail w a double concave into the fin cluster & then flat out the back to create better release, tighter turns & acceleration. Each of the models: Eggs, Eagle, Magic , & Gypsy have these features.