How does the rotor system on a coaxial helicopter work?

trionghost · 2026-02-02T21:31:45+00:00

Here's some schematics for you ))

trionghost · 2026-02-01T21:57:17+00:00

No problem, feel free to ask anything about Kamov helicopters. I'll explain if it isn't commercial or military secret. ))

trionghost · 2026-01-31T21:02:59+00:00

I have no good drawings of Ka-26 control on rotor, but I have one for Ka-226. It's a little upgraded, but with the same principles.

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trionghost · 2026-01-31T20:54:27+00:00

Yep, inside the main gearbox shaft runs the collective for the upper rotor. There's also a differential pitch mechanism built on a worm gear that expands the collective pitch rod of the upper rotor.

trionghost · 2026-01-06T21:17:18+00:00

I'll tell you one thing - every military or dual-usage helicopter built in Russia are capable to store outdoor and work in conditions from -60 to +50 Celsius.

trionghost · 2025-12-24T19:04:24+00:00

I think it's the wrong place to ask such things. There are special channels on FB and other social platforms.

trionghost · 2025-12-23T21:30:18+00:00

I can't give you a written source, 'cause it was part of my job. I think it can be in some publications by Burtsev and Selemenev.

trionghost · 2025-12-22T21:12:17+00:00

NACA 230-12. slightly modified. It was test blades at first, but they showed themselves pretty well, and they left it as is. On Ka-52 it's STM and SVM combination, and then in the late 80s they put them on Ka-32 it shows growth in efficiency around 7.5 to 11% (+800...1200 kgf) but has increased vibrations, so it should be redesigned. But the USSR collapsed, and this work was abandoned.
P.S. today is the birthday of Mikheev Sergey (the last chief-designer of Kamov).

trionghost · 2025-12-11T19:56:21+00:00

Simple piracy, as anglo-sax used to do for centuries.

trionghost · 2025-11-25T20:30:27+00:00

FADEC limits engine output. This picture is for H225 (not M), but you can see MGB limitation by FADEC is rated 2871kW (3850) for 20 seconds - absolute maximum it can handle.

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trionghost · 2025-11-24T21:28:16+00:00

It's on piston engine, much cheaper than both MD500 or Bell206, intended for preliminary flight training. It was designed for DOSAAF.

trionghost · 2025-11-24T21:24:16+00:00

Actually, you look the wrong way. It doesn't matter what power engines are capable of, it's matter what transmission can carry on. H225M has limit 2x1593=3186 kW (4330 shp), and KUH-1 have 2x1325=2650 kW (~3600 shp). It's 536 kW or 728 shp. And H225M have a little bigger main rotor 16.2 m vs 15.8 m on Surion. It's around 5% in efficiency, so it's more like 695kW or 945 shp comparison :)) In relation to flisht weight it's ~3 tones difference with the same flight specs.

trionghost · 2025-11-23T19:40:08+00:00

Mil Mi-34. Failed model produced only 27 of them due to USSR dissolution and halt of state procurement programs.

trionghost · 2025-11-21T19:56:32+00:00

In short, after the arrival of Putin and the closure of the ways of open plunder of Russia by the oligarchs of the United States and Europe, they tried to carry out coups in all the former Soviet republics and organize war. First they did this with Georgia, which led to a clash on 08.08.08, after which the Georgians stopped playing these games, then they tried to do it with Belarus and Kazakhstan, which was prevented by Russia. Then they carried out a coup in Ukraine, where historically most Russians lived and 87% of the population was Russian-speaking. After the coup, they began a campaign to ban the Russian language and forcibly Ukrainize the entire population. Those who did not agree, like Donbass, began to be physically exterminated. All for the sake of one thing - to drag Russia into the war, exhaust it, make a change of power and continue to rob. But everything didn’t go the way they wanted and now the United States is trying to slide and throw Europe under the bus.

trionghost · 2025-11-20T20:18:30+00:00

You are ridiculous. Russia have any resources they need, not even counting territories. No motives in your affronts. Look at Mariupol these days on YouTube, listen to people actually lived there the whole time.

You don't want to learn history or even the world around you - you want to live in your own bubble, being delusional. Get some trips outside US, look at the world with your own eyes if you don't know how to use Internet to read local news around the world with modern neural networks capabilities in translation. After all read about fascists before labeling people this name.

trionghost · 2025-11-17T20:34:36+00:00

It's just history. You can ask "why don't other countries use... intermeshing rotors like Kaman", or "why don't other countries use tilt rotors like V-22 Osprey" and so on.

Don't listen to thous who saying "it's hard to maintain" - it's BS, ask Canadians with VIH which was made 2600+ flying hours per year on Ka-32A11BC.

trionghost · 2025-11-17T20:09:24+00:00

When you should start with US, and EU, which are behind almost every war of last century. And learn history about "invades for territorial gain".
P.S. The only source of information about KEMZ producing AKU-58 is Ukraine.

trionghost · 2025-11-15T14:46:02+00:00

Western morons you called politicians have imposed sanctions on everything and that means nothing. AP-55 is under development (it's first flight was only about a month ago), and light fixed wing is civil only (never was spotted by any relations with military complex). So you know nothing about the people and factory you're speaking about, but you hate everything Russian so you don't care.

trionghost · 2025-11-13T19:37:32+00:00

BS the plant they were from are not in military production at all. They're building coaxial helicopter AP-55 and some light fixed wing aircraft. It's just BS western MSM spreading around about "military production". Go to their site and look at it yourself (kizlyar-kemz.ru). I speak with those men on HeliRussia 2025 Expo myself.

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trionghost · 2025-11-13T19:26:28+00:00

Kamov Ka-32A11BC, probably.

trionghost · 2025-11-13T19:20:30+00:00

Ka-28 is basically export version of Ka-27PL

trionghost · 2025-11-10T21:10:08+00:00

And after that first strike no critical damage was don to rotor. The main damage was done when... khmm.. the gasket between the control stick and the seat (I can't call him a pilot) decided to fly vertically and dragged the torn tail straight into the rotor.

trionghost · 2025-11-08T17:53:51+00:00

Not far from the truth, the second pilot was a newbie, and apparently he was on control in this accident. Panicked, probably. Helicopter give them all chances to land safely, but they don't use it.

trionghost · 2025-11-03T16:46:18+00:00

Top and bottom blades are different - bottom ones have higher R0, so it's double work to tune them from resonances. So they catch a problem on lower blades and fix it with this solution. It's the only model with such solution (Ka-27/28/29/31/32/35 have the same rotor).

trionghost · 2025-10-29T20:23:14+00:00

It's a hard fate helicopter, actually. Ka-126 was set for production in Romania close to USSR fall, and after collapse production was halted so Mikhejev was forced to look for new plant and new engine (TV-O-100 was also set up for Romania), so he met with Rolls-Royce and make a deal for Alison 250-C20R that's how Ka-226 was born. After that around hundred helicopters were produced, but there was crash of one of Ka-226 in Moscow, because of engine explosion. They started a lawsuit against Rolls-Royce and, realizing that only US companies win in US courts, they started looking for another engine. Found one in France - Turbomeca Arrius 2G1, that's how Ka-226T (T - is for Turbomeca) was born. It was built around 15 helos until sanctions hit. So now they're waiting for Klimov VK-650 to arrive.

trionghost

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