Given the interest that we all share in reducing noise, and also the issue that electrics tend to turn different props at similar RPM for different amps (rather than RPM being dictated by engine power and prop size on internal combustion engines), you might find this LINK interesting.
It takes you to a static thrust calculator - enter the basic information in the blue box and click [calculate] bottom left, and the resultant thrust is shown. I was pondering whether to add more cells (and, thus, more revs) to my electric Tiger Moth, or to try going from a 17-10 to 18-10 prop. The calculator reckons about a 20% increase in thrust by changing the prop (and still a good flying speed). That has to be worth a try! I can't vouch for the accuracy of the output, but it looks about right to me.
Ed
