Onshore windturbine in need for a manual installed light weight crane

The new YawHookTM technology allows 800 kg lifts to be performed without the need for a traditional crane on the ground.


The challenge: design a crane which can assembled by hand in onshore windturbine nacelles

LiftWerx asked Eager.one to design a foldable crane that can be mounted and moved manually. The crane needs to be able to lifts 800 kilogram, from 100 m height with a 2.5 m radius.

Eager.one’s engineers came up with the idea to use light weight “trusses”. By putting the trusses together by hand the mast is erected. The crane’s boom is attached by means of a pin in the middle of the mast, allowing the boom to slew with wheels around the mast.

Interested to read more about how we use trusses in our designs? Read Flare Tip Replacement

Calculating optimize storage in the onshore wind turbine

Once erected the crane can remove roof panels, exchange yaw drives and lift larger crane systems (like the LiftWerx HeliHook) into the nacelle.

Green engineering

Because of using light weight materials and an electric crane which lifts larger cranes into the turbine, there is no need for traditional cranes.

“It was great being a member of the design team for this tool.”
Hubert Boter
Senior Project Engineer
Phone: 0031 (0)30 2 40 80 60

 ‘ Learn about new techniques for onshore wind maintenance and in & outs on installation of onshore wind farms using large cranes. Visit our Masterclasses!

What we do

As an independent partner, we advise about, design and construct everything from concept study to project completed. Our in-house developed design software calculates everything concerning mobile cranes and bespoke heavy equipment, while our people offer the expertise and skills that secure your success.


Consultancy / Design & Construction

Our 40 years of experience provides the basis of a successful start of your project: right from the FEED phase. Preparation is vital. Therefore our concept studies, method statements and mission equipment offer you all the support you need.


Consultancy / Design & Construction

Our aim is to optimize your project team’s results. With our exclusive knowledge of lifting and transportation we eliminate and manage risks. This is how we reach our collective goal: Zero Accidents, Zero Incidents.



We have built up a great deal of experience with the design of (mobile) cranes and bespoke heavy equipment such as piling machines and excavators. Our customer base includes the most prominent producers of cranes and heavy machinery worldwide.

We are eager to hear from you

Call +31 (0) 30 240 80 60 or use the contact form. We always respond within 24 hours.

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