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05 March 2019
05. March 2019 Helicopters

The H145: from Bluecopter to the big-time

The new version of the H145 flies in the Pyr茅n茅es region of France

The H145 surprised even its engineers with the qualities of its new main rotor. Below, the story behind the rotor鈥檚 development, and how it ended up on the H145.

At Heli-Expo 2019, some of the buzz has been focused around AG真人计划鈥 H145 and its brand-new rotor. Five bladed, bearingless, with a smaller hinge offset . . . the innovations packed into this single element are more than we usually see revealed on an aircraft.

First prototype

The H145鈥檚 rotor actually started life on AG真人计划鈥 Bluecopter technology demonstrator. 聽This re-engineered H135 was unveiled in 2015 as the company鈥檚 test bed for new technology, kitted out with such innovations as a new Fenestron tail rotor, a T-tail, and a bearingless 5-bladed main rotor.

鈥淭he Bluecopter was a highly modified H135 with a larger rotor diameter than a normal H135. Its ride and comfort were so good that we had the idea to strap it onto an H145 and see what it would do,鈥 says Carl Ockier, the H145鈥檚 flight test engineer.

Overwhelming results

鈥淲e started with lower aircraft weights and incrementally increased. And all of a sudden, we found out that this rotor seemed to be perfect for the H145,鈥 says Alexander Neuhaus, the test pilot on the Bluecopter and H145. 鈥淲e were surprised, because although the rotor was not designed for the H145鈥檚 weight and aircraft type, by just taking it off the H135 and putting it on the H145 the result was overwhelming. That ended with the decision to go on with testing.鈥

There was little more to be done. The programme ran calculations and did simulations to make sure the rotor could withstand the H145鈥檚 flight load. Small modifications followed and then the H145鈥檚 testing campaigns began to certify the new rotor.

We were surprised, because although the rotor was not designed for the H145鈥檚 weight and aircraft type, by just taking it off the H135 and putting it on the H145 the result was overwhelming.

- Alexander Neuhaus, the test pilot on the Bluecopter and H145

The new H145

An unexpected advantage

As on an H135, the H145鈥檚 bearingless main rotor works thanks to a flex beam that allows the rotor to flex both in flapping and lead lag motion, and to be twisted so that the blade angle can be changed for collective and cyclic control. The advantage is no bearings, so no moving parts that require maintenance.

What鈥檚 different on the H145鈥檚 rotor is that, whereas on the H135 the part where that flexing is done is an integral part of the blade, on the H145 there is a physical separation between the two: the flex beam is bolted onto the blade. This brings benefits to customers for maintenance or damage; rather than replace the whole blade, technicians just need to replace the blade鈥檚 outer part.

Smooth and controlled

The H145 is also reported to have an excellent ride. This is due to its smaller hinge offset. Helicopters with articulated rotors have a defined hinge somewhere, where the blades 鈥渇lap鈥 to meet various roll or pitch states. The further out the hinge is from the centre of the hub, the more controllable the aircraft will be, but the more it will react 鈥 and feel bumpy 鈥 in gusty winds.

On the current H145 models, the hinge offset is around 12%. The new design was able to bring this to around 7%. What鈥檚 the advantage? The smaller offset is what gives the H145 a smooth ride while still retaining control in turbulence. During their ferry flight to the H145鈥檚 winter testing grounds in Finland in January 2019, Neuhaus and Ockier encountered about 30 minutes of intermittent gusts up to 65 knots. The H145鈥檚 handling qualities didn鈥檛 suffer in the least.

AG真人计划 Helicopters unveils new H145

 

The H145鈥檚 new five-bladed rotor brings a significant increase in overall performance, with a maximum take-off weight raised to 3,800 kg and a useful load now equivalent to the aircraft鈥檚 empty weight. Read less Read more

HAI Heli-Expo 2019

HAI Heli-Expo 2019

Visit the event page

The multi-purpose H145

The multi-purpose H145

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