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If I were you I’d also consider adding eye protection!
I'd say that's the least of his concerns if it undergoes an RUD.
(but yes, probably an idea)
Fantastic! Well done! 😀
Thank you! 🙂 🙂
Very enjoyable. Thank you. I wondered if you could uses a fast Fourier transform of the harmonics from the engine sound to estimate turbine speed? Might be simpler than direct imaging.
I’d skipped past this thread so many times and never clicked on it until this morning.
That’s absolutely awesome 😎😎
I’ve had a flick through the build thread too, some amazing work.
Very enjoyable. Thank you. I wondered if you could uses a fast Fourier transform of the harmonics from the engine sound to estimate turbine speed?
Thank *you*! - Yes, audio analysis is a possibility, but I'm not sure how much I trust it - Out of curiosity, I ran the video with an Iphone spectrum analyser listening to it. I had to pick a peak out manually, but that showed the frequency of the 'whine' at idle varying between 430 and 480 Hz which corresponds to ~25,000 to ~29,000 RPM which seems very credible, based on expectations and the tacho measurements from the previous run. Rather worryingly, the frequency rose to ~1550Hz at the highest power levels which corresponds to ~93,000 RPM! Rather closer to the edge than I thought. I need to sort out something reliable!
That’s absolutely awesome
Thank you very much, Phil. I'm liking it too 🙂
(I had to do something to keep busy after I finished the van!)
Audio could work, but it's not like an IC where there is a simple base frequency being produced by exhaust pulses. Plus you have to do it after the fact, rather than a live measurement.
It's been said before, but, awesome work.