Originally Posted by
retreating blade
CH47 HC1 had a VNE of 160 kts, I explored this limitation en-route RAF Gutersloh in I think 1983 trying to catch a Puma .going to the same destination. I was overhauling the Puma when I saw the airfield passing below. Quick power reduction took ages to slow down and late call finalls to land. Not many helicopters are able to maintain VNE straight and level!
Some A109s can do 168kts in S&L flight, which is the type’s VNE.