This run of the MP Jet 061BB has the muffler off and is running as fast as it will go on the special "break-in" fuel mix. It is turning the APC 7x3 prop at around 15,300 RPM here, but with normal model diesel fuel there should be another 1,500 RPM of performance at least. A friend's fully run-in 061BB will do well over 17,000 with a 7x3, unwinding to 18,000+ in the air.
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