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Message: <blockquote data-quote="MrGiggles" data-source="post: 510065" data-attributes="member: 22613">Seems to me that it would be very unwise to buy a prop (an expensive stainless one, no less) four months in advance, without knowing your baseline. If it turns out to be wrong, which it very well could be, you'll be well past the return window and have an expensive doorstop.I'd spend the winter rigging a tach first. I'll jump on the bandwagon of a 15 being way too much for a 40. In addition, diameter typically decreases with an increase in pitch, which makes me wonder if you are looking at a prop that is not designed for that motor. Pitch and diameter aren't everything, there are a myriad of hub diameters as well.</blockquote>