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Old May 22nd, 2010, 05:22 PM   #1
homunwai
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Coaxial vs conventional helicopters

There have been literatures to suggest that coaxial helicopter are better than conventional helicopters:
- no rear rotor, all power dedicated for lift.
- more balanced, easier control.

But so far, there are only a few of such products, eg, Kamov's Ka 32, and the Ka 52.

Is this technology is superior, why there is no widespread adoption?
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Old May 23rd, 2010, 01:03 AM   #2
siamu maharaj
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More complex? More expensive? Exepnsive maintenance? Prone to failure?

Could be a lotta things.
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Old May 23rd, 2010, 09:24 AM   #3
Arkdriver
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coaxial concept has been there for few decades already but so far only few models adopted the concept. The latest is that Kaman helicopter, small, heavy lift type...i believe the focus on helicopter industry now is gearing towards tilting rotor. The conventional tail rotor has proven its worth. But the main problem of having coaxial rotor is the size of the main gearbox. gearbox is sensitive, heavy and need regular maintenance. the heavier the rotor, the more complex the gearbox become, thus reducing usable payloads but i have seen kamov ka32 variant doing heavy lift and they are doing just fine. the problem remains in certification for parts and maintenance. Despite being the best in heavy lift, ka32 still face many hurdles. I dont know why.

When it comes to building helicopters, no one can match the russian. their strength remains in the philosophy of building helicopter itself. With exception of Hind, each helicopter is designed for a specific purpose.

Unlike fixed wing, the useful life for a model of helicopter can span decades with minor upgrades along the way. Take for instance super puma, see how many years has it been in service with unmatched performance in the north sea oil industry.

i dont see the need for a new coaxial helicopters in the next 10 years. In 15 or 20 years, maybe.
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Old May 28th, 2010, 10:19 AM   #4
homunwai
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But, Sirkorsky X2 will be a coaxial. Hope this will be a revival.

Is tiltrotor doing well? The V22 is not.

However about tandem?

Why the largest heli fr the US is the conventional CH53, and not something based on tandem like the Chinook?
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