A quick question ; What is the use of the set of small tri-blades inside the shroud at the back?I will probably get clubbed to death by Gökbey design team for this View attachment 79136
One of the andvantages of coaxial blades is to get rid of the small rear rotor.
As a coaxial blade set generates more lift from the same powered engine, it will have better MTOW and better speed.
It won‘t need propellers at the back to give it forward speed too. Besides these will detract from performance of the helicopter due to weight and increase complexity of design.
Coaxial rotors have a lot of advantages. But they are more expensive, more intricate and difficult to manufacture; and also they can be, in rare occasions prone to whipping especially in adverse weather and can cause blades to touch and catastrophically break.
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