I’m not an expert , but my understanding of counter rotating props , like the avro Shackleton , Tu-95 etc is that they rotate at the same RPMStupid questions for airplane people. Counter-rotating prop questions (I was looking at Tu95).
In ideal configuration>
1) do the axial rotation of outer prop and inner prop rotate at the same revs?
2) if they do, what is the (ideal) phase relationship?
3) what is the reality on Tu95 according to the above.
Helios with coaxial rotors>
same question series. 1,2,3
My WAG> fwiw the Tu seems to my eye to "answer" 1 > yes 2> there's maybe 5 or 10 degrees of phase shift.
as to helios, I have no real idea...
What say the experts?
This Friday is flight day. Hope it isn’t cancelled due to smoke from our wild fires. Will post pics if I become airborne.
Thanks very kindly. The "mechanical" or "engineering" histories from the old SU - and the (econo-political history too)..these fascinate me. The "inner design philosophy" that can be seen in the objects. When the Soviets sold themselves I was able to get all sorts of stuff from the loot...a clock, for example, from a Soviet submarine (it weighed about 2 kg!)...anyway the props - understanding the fluid dynamics ... I used to install and/or overhaul steam turbines...and picture the CR propset as having a phase relationship very approximately analogous to the relationship one would have if the turbine case with its diaphragm stages was rotating as one of the props, while the rotor spun as the other prop. Of course that's a hoot to imagine! But at design speed and load in an old GE steamer there is a phase relationship - each "mu" gets bashed in a sort of zigzag to the condenser...but I don't think it's spoken of in those terms.I’m not an expert , but my understanding of counter rotating props , like the avro Shackleton , Tu-95 etc is that they rotate at the same RPM
I’m not sure of phasing , but I do know the 95 noise / vibration on full power run ups would make ground handlers physically sick …
If it ever comes back yo the area, I'm gonna' do it !!!It's worth the money if they come to your area
So, both the Germans and Americans experimented with what were, crude air launched cruise missiles in the second warWorlds first 4 engine jet biplane?