Merlin
The Merlin has negative pitch and a harpoon for deck ops. My understanding is that the harpoon is normal option for small ships (frigate/destroyer) but it needs right infrastructure on the deck. If you push through the minimum collective pitch stop in flight, the rate of rotor rpm is very high. The pitch is adjusted to give the right rpm at light weight at a high density altitude (which I think is worst case). So at higher weight or lower density altitude you won't need to bottom part of the range anyway (except for a brief period on entry or when bunting from low speed)