Originally Posted by robert sailor
I have no problem accepting that but tell me what time of the day were you racing and was it in the summer or winter?. I found that after lunch that bloody wind
kicks in and I think I could have gotten hull speed dragging a pail, LOL. I never experienced the props helping pointing that much but you have lots of experience and I have no reason to doubt you. My personal experience has been racing in light airs in the Vancouver area and the boats with fixed props are really left behind in a big way however when it really blows the odd time we find that some of the boys with fixed props are right in there. I'm a bit out of date but you used to get 3 seconds for the difference between a fixed and a folder but in actual sailing its not even close.
Well, the short answer is that the ocean races tended to start around 1000 IIRC and some of the bay races started later. Some of them went all night, some were shorter. We raced year round. And yes, in the winter the winds are often lighter, unless a winter storm is around, and then they can be even stronger than the summer sea breeze that we enjoyed so much.
The boat involved was a yankee 30, and I raced in the Single
Hand OYRA ocean series, the Yankee 30 one design bay races and lots of special event races. Busy, busy... long ago when I was young and energetic!
As to where the prop helps most, I think referring to a yacht design book would likely clarify that issue. I don't have such on board, but my memory of the issue is as I said: at low speeds skin friction dominates, at high speeds wave making dominates and in between parasitic drag from props, keel
vortex generation and so on adds up to dominate the sums.
I thinkk Marchaj reflects on this in one or more of his books
, read decades ago! Doubtless other folks have done so as well.