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After the nitro drill, I wanted to try and make similar projects with this kind of rc engines. Unfortunately, success didn't come fast because I had to remake the whole build 3 times. I started with a Cox 049 (0.8cc) airplane engine which is very delicate concerning the fuel mixture as it requires at least 15% pure castor oil. Modern fuel blends include a small percentage of this oil, with the rest being synthetic. This lead to its failure due to the ov
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