We taught this profile for approaching:
65-70 kts (auto speed) and descend power (which will vary depending on your weight)
@ 100 ft - 65kts
@ 50 ft - 55kts
@ 10 ft - 40kts
(or there about)
transition back into the hover taxi and then the hover...
This keeps you in a safe flight profile.
The intire approach up until close to losing transition is done keeping the collective quite still and using the cyclic more. Close to when translational lift starts to lessen, start feeding in the collective and the cyclic forward to keep attitude, correct with pedals and hover taxi onto the pad. Remember, this is all done at the airport with lots of open space. Much later on in the training, they will learn about a more steeper approach into a tighter confine, but for this stage of the training, safety is our biggest thing... especially when they start going solo...