Wow, how things have changed over the years, in Borneo in the early sixties, during the confrontation, this was a regular happening. The army would make a clearing by blowing trees up, the whirlwind tens would take a blade hit trying to get into the clearing, they could not land because of the tree stumps, so had to back out, being mind full of the tail rotor.
Pilot would radio back, and return to a suitable river bank, where he would land in the shallows and shut down. In the meantime and airframe fitter would have been positioned on top of the bank, at blade height, armed with a hand drill, and pop rivet plyers. Three tips would be changed, and aircraft on its way again.
I guess that you could not do that these days, as the old Whirlwind had a VNE of only 95 knots.
Any one wanting a good read of those days, get hold of a copy of Borneo Boys, by Roget Annett, ( Pen & Sword)
It also dispels some of the myths about the Belvedere, which actually lifted 95 000 troops and 10 Mlbs of freight in 4500 operational hours.