Several More Chinese Coaxial Helicopters

[okikuma]

Several more coaxial helicopters in China.

Wayne

1 coaxial helicopter

Coaxial helicopter—— Made by a Chinese farmers 共轴直升机 中国小伙制造

Ultra-low altitude flight test 2022 09

sea of flowers coaxial helicopter

 

[okikuma]

 

[Mayfield]

Anyone else notice the remarkable lack of stick shake on all these machines?

Jim

 

[okikuma]

Anyone else notice the remarkable lack of stick shake on all these machines?

Jim

Jim,

For their own person consumption, they build to strict tolerances, highest level of reliability, quality, and craftsmanship. Items for export, flood the market with cheap junk and timed obsolescence.

Wayne

 

[RogerB]

Would never buy a Chinese aircraft, I wouldn’t trust the safety and reliability.

 

[Mayfield]

I have about 250 hours in Yak 52/Yak 18A aircraft and about 300 in the Nanchang CJ-6A.

The Nanchang is a wonderful airplane. Well designed and engineered. The pneumatic brakes, landing gear and starter are elegant in design and execution. It is a delight to fly.

I guess we can find lemons and plums made in any country.

Jim

 

[okikuma]

I have about 250 hours in Yak 52/Yak 18A aircraft and about 300 in the Nanchang CJ-6A.

The Nanchang is a wonderful airplane. Well designed and engineered. The pneumatic brakes, landing gear and starter are elegant in design and execution. It is a delight to fly.

I guess we can find lemons and plums made in any country.

Jim

Jim, I have yet to fly a Nanchang CJ-6A. I've seen the aircraft up close since there are a number of examples here in SoCal. From all who I have spoken to that have flown and/or own the CJ-6As. I've never heard a negative comment, including your comments.

As you have mentioned it is a well built aircraft that is very simple to maintain. Simplicity is the norm. One has to remember that these aircraft are maintained by conscripts with little advance education if any. Pneumatic systems are easier to maintain in the field than hydraulic systems. Air is free. A supply chain is needed to provide hydraulic fluid out in the field.

The engine is also simple to operate and maintain. The Housai HS-6 nine cylinder radial engine is a licensed built derivative of the Soviet Ivchenko AI-14. Of course, the PRC had made certain changes and upgrades.

As compared to American radial engines, both the Soviet and PRC engines are of comparatively low compression. This follows the old doctrine of the ability in using the fuel supply within an occupied nation. Fractional distillation of crude oil creates gasoline that is around 72 - 78 octane as it sits within the fractional distillation tower, before any additives.

Low compression engines of 6.5 to 1 or less can operate on the gasoline right out of the fractional distillation tower. No more costly refinement is needed. This is the reason why the old Soviet and PRC gasoline powered vehicles and the smaller internal combustion powered aircraft of the 1940s to 1960s had low compression engines. As the Soviets and PRC "upgraded" to diesel powered vehicles and turbine powered aircraft for military operations, simple kerosene and diesel fuel from the fractional distillation tower without further refinement would be used.

Would never buy a Chinese aircraft, I wouldn’t trust the safety and reliability.

Roger,

The Nanchang CJ-6A was never designed to be a consumer product for the West. Only for internal military use, therefore it has to be reliable and have a long operational, trouble free service life. Simplicity along with the highest level of quality and craftsmanship accomplishes this goal.

Wayne

 

[Mayfield]

Many people think the CJ-6A is a copy of the Yak-52. That is inaccurate. The CJ-5 was a direct, license-built, copy of the Yak-18A, but the CJ-6A, although similar to the Yak-52, is a domestically designed aircraft.

Jim

 

[okikuma]

Many people think the CJ-6A is a copy of the Yak-52. That is inaccurate. The CJ-5 was a direct, license-built copy of the Yak-18A, but the CJ-6A, although similar to the Yak-52, is a domestically designed aircraft.

Jim

That is absolutely true Jim. The CJ-6A is a vast improvement over the CJ-5. The PRC knew what they wanted in a trainer and the CJ-6A is the result.

Here's an interesting company that services and rebuilds the AI-14 and HS-6 engines in the UK.

Overhauling the HS-6 engine | Richard Goode Aerobatics

Wayne