As a helicopter pilot for 35+ years as well as an instructor for 25 years, your videos on PoF have given me immense joy to watch and reminded me so much of my good time in Bristow Redhill. Well done.
reduce collective pitch and slowly decrease pressure on your cyclic. Stay away from your VNe speed and don’t maneuver too aggressively to avoid this in total.
@wyattdean5192 Is Vne is hard wall ias limit or is there a 10 knot buffer ? Where helicopter starts shaking and bucking. Or does RBS occur catastrophically at Vne? Which is more likely to RBS . Larger diameter 2 bladed rotor with lower rotor RPM, or smaller 4 or 5 bladed articulated rotor with higher rotor RPM? Think Bell 202, 204, vs . MD-500/OH-6A.
@ Yes the VNe is basically a hard wall limit because as you go faster the positive stall region on the rotor disk grows which is at the tip of your retreating side. It’s always best to avoid flying at or above your VNe not because it’s 100% guaranteed, but it’s extremely likely when flying nearer above the speed. RBS can happen to any helicopter, 2 bladed or more, semi-rigid or fully articulated they are all prone to RBS when at high speeds, this is why most helicopters don’t fly super super fast.
I’m not entirely sure. As it is a high speed blade I would expect to be symmetrical however I would also assume all blades are different depending on the intended aircraft weight and rotor speed
Awesome video. Thank you so much.
As a helicopter pilot for 35+ years as well as an instructor for 25 years, your videos on PoF have given me immense joy to watch and reminded me so much of my good time in Bristow Redhill. Well done.
Haha, I also had some good time with Bill Barrow in Redhill.
OK so what is the immidiate action drill for recovery from RBS? Assuming two bladed rotor.
reduce collective pitch and slowly decrease pressure on your cyclic. Stay away from your VNe speed and don’t maneuver too aggressively to avoid this in total.
@wyattdean5192 Is Vne is hard wall ias limit or is there a 10 knot buffer ? Where helicopter starts shaking and bucking. Or does RBS occur catastrophically at Vne?
Which is more likely to RBS . Larger diameter 2 bladed rotor with lower rotor RPM, or smaller 4 or 5 bladed articulated rotor with higher rotor RPM?
Think Bell 202, 204, vs . MD-500/OH-6A.
@ Yes the VNe is basically a hard wall limit because as you go faster the positive stall region on the rotor disk grows which is at the tip of your retreating side. It’s always best to avoid flying at or above your VNe not because it’s 100% guaranteed, but it’s extremely likely when flying nearer above the speed. RBS can happen to any helicopter, 2 bladed or more, semi-rigid or fully articulated they are all prone to RBS when at high speeds, this is why most helicopters don’t fly super super fast.
@ You’ll notice RBS when the helicopter pitches up and or rolls to the retreating side un commanded.
A dumb question from a non-helicopter guy - is the rotor blade airfoil symmetric or does it have some camber?
I’m not entirely sure. As it is a high speed blade I would expect to be symmetrical however I would also assume all blades are different depending on the intended aircraft weight and rotor speed