Minetest 5.1-dev+ mod: Simple helicopter
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originally by Pavel_S  
reworked by DS-minetest

License of source code:
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original code by Pavel_S: GPL_v2  
changes by DS-minetest: TODO  
`matrix.lua` file: CC0

License of media (textures and sounds):
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helicopter_motor.ogg by  Robinhood76 | License: Attribution Noncommercial

textures and model are probably by Pavel_S, TODO