"As you would know (and many others who have the pleasure of some UH1 experience), who hasn’t experienced the “thwack-thwack” as the tips gently hit the soft green mangrove leaves along Shoalwater Ck while your crewman tries to retrieve some crab dilly pots out of the water with a fire rake? 
No harm with soft impacts...rotor blades can be quite surprisingly robust and damage tolerant."
Ring gear you used a fire rake , we carried a rock anchor to fish them out with the hoist and a couple of orange baskets in the back to put the crabs in before resetting the pots, Iroquois blades were like big whipper snipers, ah the good old days at Albat T Ross productions. have seen a few blades strikes on Black Hawks and Iroquois flying up Star Wars alley (fire breaks) in the pine plantations at Schoalwater Bay.