It seems like since switching to a much bigger prop, I have not had a working tach, a working ammeter, decent weather, and time on my hands, all at the same time. So now that I have a new tach installed, I resolved to get up early enough today to beat the heat and the rain, and do a speed run.
.5a 33RPM .3Kts
1a 90RPM .6Kts
2a 190RPM 1Kts
5a 271RPM 1.5Kts
10a 402RPM 2.3Kts
15a 450RPM 2.5Kts
20a 505RPM 2.8Kts
25a 550RPM 3Kts
30a 576RPM 3.2kts
35a 605RPM 3.4kts
40a 638RPM 3.6kts
50a 730RPM 3.8kts
60a 762RPM 4kts
80a 795RPM 4.4kts
100a 850RPM 4.6kts
120a 880RPM 4.9kts (Current off scale, estimated/extrapolated)
FULL 950RPM 5.1kts (Ammeter pegged hard, current estimated at about 135a)
Because the ammeter is an analog unit with a 100a scale, current readings under 5a are very much open to interpretation. Winds were extremely light, and there was no current at the testing site. A single run at each speed was performed, lasting long enough to stabilize the GPS speed. Keep in mind also that I was rather busy during testing and I could have made mistakes. Traffic was light but there was still some, there were fixed objects to avoid, a straight course had to be steered, all while working throttle, smartphone, pen and pad, and beer.
When I get around to it I will change motors and do more speed trials. I have a 12kw ME0913 motor that I have previously run but without full proper working instrumentation. I will also hook up a 200a ammeter when I test that motor again. I do not think I will see any significant difference in performance at lower settings but I imagine the full power setting will be interesting.
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