[ApS]

My friend with the older Glastron-19 got back to me. All he could offer was that the battery may be on the wrong side. He has no whaletail. He adds that there is a tab on the stern that is factory set to compensate any irregularities, keeping it straight.

If the prop's rotation is changed from the stock rotation, the list should be constantly "wrong". I'd remove the whitetail, inspect it for flaws, and try the ride without it.