but think you are missing the point. If you do this a lot you would know what I`m talking about.
I do concede that I have not done a lot of autorotations for real
VL, Why would you want to fly below Vy on an ARA approach?
The reason for flying an ARA at VY is if you loose an engine at this point, all you would have to do is adjust collective. All the rest is set, a/c attitude, Best Rate of Climb 80kts. The drawback is your speed is to high for arming the floats.
Why, lot of reasons that any experienced offshore driver could list. In fact I would be surprised if your approach plate did not offer some guidance regarding slowing down close to Vmini. In any case your logic is flawed, the important speed is Vtoss. How do you think an LDP of 50kts is established. Using your logic the LDP should be Vy??