Originally Posted by
FH1100 Pilot
yes an aircraft with a similarly light disc loading and low downwash speed.
It’s not very scientific but I have always considered that the downwash speed of a helicopter in an OGE hover is probably equivalent to its RoD in a bucket speed auto - both steady state with no acceleration but I couldn’t prove it mathematically.
The higher the disc loadings of helicopters I have flown, generally the higher the RoD in steady state auto.
The 350 from memory is about 1800 to 2000’ per min so you would need about 900’ to say 1500’ per min to meet the first condition of VRS.