Unclear, but see LAK's Facebook page and Martin's posts. On one account there's a LAK17C-FES which implies a non-self launching version that is "totally" different than the 17B-FES. What do you call a self-launching front engine glider? FESL (front engine self launcher)? One reply by LAK to the Facebook fight review (which reads like an ad) was "Big" when answering a question about what mods they made to the wing. Together, one might envision the 17C has a new wing (more than a twist) with an option for an FES or FESL, the latter having a larger propeller, more power packs and increased ground clearance. Only guesses meant to tease us? Maybe John will share what he knows about pricing?