Russia accidentally leaks image of high speed rotorcraft
Thread Starter
Russia accidentally leaks image of high speed rotorcraft
Join Date: Mar 2010
Location: Often in Jersey, but mainly in the past.
Age: 79
Posts: 7,812
Received 137 Likes
on
64 Posts
I always thought that blade tip speed was a limiting factor. Relative to airflow, advancing tip goes supersonic, retreating blade stalls, or simething like that. How does this design overcome that law of aerodynamics to achieve such a speed? Or is it relying on the stubby wing and jet propulsion, with freewheeling rotor blades, in high-speed cruise?
Join Date: Mar 2010
Location: Often in Jersey, but mainly in the past.
Age: 79
Posts: 7,812
Received 137 Likes
on
64 Posts
Join Date: Mar 2010
Location: Often in Jersey, but mainly in the past.
Age: 79
Posts: 7,812
Received 137 Likes
on
64 Posts
Join Date: Mar 2010
Location: Often in Jersey, but mainly in the past.
Age: 79
Posts: 7,812
Received 137 Likes
on
64 Posts
I am bereft of ideas. I defer to those such as you who have done transitions!! Do you have helipopter time? I was only PPL!
Join Date: Oct 2017
Location: UK
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
I have no helicopter time, only fast jet time, but have learnt a bit by doing technical illustrations for a coupe of manuals on the subject, one written and published by a frequent PPRuNe contributor.
With the coaxial set-up, the retreating blade doesn't have to produce any lift, so it can relax a bit. With a normal helicopter, where the advancing blade can produce 7 x more lift than the retreating side, it has to throw away that extra lift and only develop as much as the poor old retreating blade is struggling to provide.
Coaxially, the advancing blade can produce as much as it wants, and let the retreater have an easier life.
Coaxially, the advancing blade can produce as much as it wants, and let the retreater have an easier life.
Join Date: Mar 2010
Location: Often in Jersey, but mainly in the past.
Age: 79
Posts: 7,812
Received 137 Likes
on
64 Posts
Thanks, A C. That helps me understand much better.