Chinese Aviation Industry

ladioussupp

ladioussupp

Junior Member
ladioussupp said:
Technology Innovations Drive New Concept Helicopter
by AVIC China Helicopter R&D Institute (CHRDI)

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In this article, three helicopters, K800, "Blue Whale", aand a clean energy driven helicopter are mentioned.

Besides, CHRDI held three competitions of "New Concept Rotar Vehicle" since 2008.
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"With the enhancement of environmental protection concept transportation of energy saving, emission reduction and noise reduction has become an important field of transport research. AVICOPTER is developing a project of electric driving unmanned helicopter. The aim of this project is developing these key technologies of electric driving helicopter configuration, high-energy ratio battery and management system, high power density motors and control systems. It will achieve the flying demonstration of the new concept electric driving unmmanned helicopter in 2014. The helicopter uses high-power lithium-ion battery as power. A DC servo motor is used as the driving system. The blade with noise reduction is used as the lift system. These applications can achieve the purposes of energy saving, emission reduction and noise reduction. The helicopter can perform battlefield detection, attach, wire patrol, aerial photography and other military and civilian missions."

My question is why using a single servo motor and waste power in driving tail rotor? It is usually estimated to lose about 10% power in transmission.

32269_296274_998403.jpg32269_296273_568814.jpg
 
TerraN_EmpirE

TerraN_EmpirE

Tyrant King
rhino123 said:
I don't understand... if this air vehicle already had a pair of coaxial rotors, why would it still need the nose propellers?
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speed. The coaxial rotors are to provide lift and do a good job but if you want turboprop speed you need another way to ramp up the velocity. The rotors act as wings the props well props. Its like the Sikorsky x2 or the Russian Ka92 concept built backwards.
 
Quickie

Quickie

Colonel
rhino123 said:
I don't understand... if this air vehicle already had a pair of coaxial rotors, why would it still need the nose propellers?
Click to expand...

Likely it's not the same as conventional coaxial rotors that normally provide the vertical as well as forward thrust . Assuming the model is correct, the lack of blade tilting mechanism points to the coaxial rotors providing only vertical thrust, which explains the use of the counter rotating props for forward thrust.
 
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