I'm a bit surprised at the various ideas put forward for this interesting question. Helicopter offshore operations have been in existence for many years and the 212 for over 25 at least. Nearly all companies I've flown for use this basic tecnique.
1. Low hover at front of deck with blades NOT overlapping to build up ground caushion. Position can vary due to deck design & the turbulence you're getting.
2. Apply full available power & climb vertically.
3. At 20 feet radalt (15 feet minimum )for most medium size helicopters, while you still have a POSITIVE rate of climb, rotate fairly positively to about 10 degrees nose down. ( Can vary slightly with c of g )
4. If you can't reach this height, you are too heavy.
5. CDP is the point of rotation. Engine failure before rotation, land back on. After rotation, maintain collective position for transient time if nessary, while looking for VToss, level off and accelerate to VBROC.
6. By having 10 degrees nose down, your tail should be well up and clear of the deck.
7. This works by day or night. In fact you can do this all with your head in the cockpit looking at the instruments and is not a bad method to demonstrate to an unbeliever.
8. This method has worked well for me for over 40 years both in the cold of the Antarctic and the heat of India.
9. Obviously if the helicopter is very light and you have a strong helpful wind, you can modify this. Never make rig work too black & white.
10. Tearing along the deck to gain airspeed is very much a no no.
11. Now watch me be blown to pieces!!
