How to get the second propeller for the flying machine?

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At the last part of the Flying Machine level in the Goblin Menace, you need to finish assembling the machine by picking up two propellers. The first was found easily, but the second appears to be connected to the ceiling with an unbreakable rope.
There's a flame on the left (not currently activated in the screenshot above), but it's blocked, and I haven't any idea how to cut the rope. The space to the left and underneath the propeller are blocked.
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Besiege Flying Machine Tutorial | The Basics of Vertical Flight
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Images: Pok Rie, Rodolfo QuirĂ³s, JESHOOTS.com, Pixabay