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  Main cylinders, and crane base.

You will be amazed by the forces at play when lifting the boom, extended and loaded! Initially I wanted to go with a hydraulic solution to this, but it's expensive, and requires quite some space and spills oil. Also: In the event of a hydraulic line failure, having no line break valves would allow the boom to drop to the ground, posing a huge risk.

I then looked around, and found the electrical answer to that: Concens CON35 actuators! They can lift 2200N - each. (Yes, 2200 -- that's 224,34 kgf) I am aiming at 6-7kg load + boom weight + hooks + wire etc. capacity at full boom length (3-4m)
The actuators are locked (<5400N) when the power is turned off, so they even answer my safety concerns.

  The actuators will run on the 12V system voltage, through the dual-actuator controller C2-30.
The controller can be adjusted using a laptop PC, and offers a very wide range of features, for example speed, overload protection, keeping them in sync, end stop control, and much more.
The controller will go on the crane somewhere, and hook up to the RC receiver via an electronic RC switch.

  Actuator data:
Con 35 with 1:71 gearing ratio. Maximum speed 3 mm/s at full load (2200N), max static load 5400N. Stroke is 250mm, max power is 3,6A
Multiply that by two, and you get the power behind the boom!
Data sheets (pdf) are available here: Controller and actuators and more actuator data




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