The pod definatly slows the air In the tunnel, no doubt. The tadpole or rain drop shape are my original thoughts but, after doing a airfoil test on this online simulator I was thinking about sort of a mirrored tadpole with the point coming Into the belly and going out.
I want to make this pad/pod as small as possible mostly rounded over. I like the leading sharp edge. Then again, the pod will need to cut through the water when It touches water... Hmmm...