This data also comports fairly well with the data from many E-boats over the past 18 years whereby for every knot increase in speed, the power required doubles.
From: electricboats@groups.io [mailto:electricboats@groups.io] On Behalf Of wdr99 via groups.io
Sent: Tuesday, July 13, 2021 9:43 AM
To: electricboats@groups.io
Subject: [electricboats] Redwing 18 electric data
Hi everyone,
I finally got my Redwing 18 out on the water with the Torqeedo Cruise 2 motor. It exceeded or met my performance expectations. Hopefully this chart paste works out.
When I was calculating my expectations for performance, I assumed I could reach 6.2 mph as a top speed, and it turns out I can! All those hull speed calculations out there in the world are actually demonstrably accurate. I assumed a static exponential ratio of throttle to power consumption but it turns out, in my case, to not be static. Therefore, I experienced about a .5 to 1 mph boost in the low to mid throttle areas. Thus, with a 100ah of lithium I could expect about 7 miles of additional travel per charge in those throttle ranges with 80% depletion.
When I was researching performance, I was anxious to find real world data, so hopefully someone else finds this useful.
Bill
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