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You might want to let it spin if you're not on a full keeler..A racing trick that a lot of racer's without folding props use to reduce drag while sailing is to mark the prop shaft so that someone can jump down into the cockpit locker and set the prop to be vertical (in-line with the keel) to reduce drag. (This assumes that you have a 2-Blade prop).
What's something you can mark the metal shaft with that will be resistant to water, oil, etc..., but not something that will damage the metal?
Prop Drag Test Video (LINK)