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post #1 of 9 Old 08-08-2013 Thread Starter
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Sailing Efficiency Ratings????

I was just curious...is there any reference that tells you in X amount of wind with X amount of sail area you should be able to attain X speed? I know it will vary depending on boat and current, but something in general?

The reason I ask is I was sailing with my 155 and it was about 8-9 knots of wind and I was at 4.5 knots of boat speed...I was happy, then I wondered...is that actually good??? What if I should be able to do 5.5 knots with that sail area? Just wanted to see how efficiently I sail my boat! Also would be cool to see what other boats sail in the same wind/water conditions.

S/V Cuajota - 1975 WD Schock Santana 30

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post #2 of 9 Old 08-08-2013
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Re: Sailing Efficiency Ratings????

There are generally polar charts for boats that show for a given wind speed and point of sail what the boat is "capable" of, which can also be influenced by sea state (surfing, bashing into waves, etc.).

For example, here are polars for my boat (S2 7.9):

http://hottamaleracing.com/misc_files/New_79_Polar.xls
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post #3 of 9 Old 08-08-2013
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Re: Sailing Efficiency Ratings????

You could find boats of similar speed potential (look at PHRF ratings that are close). Arrange to go out when they are and compare speed. If you just want to experiment on yourself, then make adjustments and see if you go faster.

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Re: Sailing Efficiency Ratings????

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Originally Posted by Barquito View Post
You could find boats of similar speed potential (look at PHRF ratings that are close). Arrange to go out when they are and compare speed. If you just want to experiment on yourself, then make adjustments and see if you go faster.
This was going to be my second suggestion, or better yet, go do some beer can races around the buoys! That'll show you quickly whether you are doing well or not. (I need to take this advice myself...)
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Re: Sailing Efficiency Ratings????

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You could find boats of similar speed potential (look at PHRF ratings that are close). Arrange to go out when they are and compare speed. If you just want to experiment on yourself, then make adjustments and see if you go faster.
Thats kinda useless...lol...because...I dont know how well THEY are sailing! If they have old tired sails, etc...

Looking for a good baseline. Not looking to sail faster than the next guy, just sail the most efficiently with what I have.

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Re: Sailing Efficiency Ratings????

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Thats kinda useless...lol...because...I dont know how well THEY are sailing! If they have old tired sails, etc...

Looking for a good baseline. Not looking to sail faster than the next guy, just sail the most efficiently with what I have.
That's where being in an actual "race" would make it a bit more likely that you can get a good baseline. Really, if you are racing handicap races, then you can see how you perform against even significantly different boats on corrected time. Other than that, polars seem to be the only truly empirical way to measure your boat's performance against the "expected" performance of the boat model.
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post #7 of 9 Old 08-08-2013
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Re: Sailing Efficiency Ratings????

Newport, you should be able to find a polar chart for your boat (ideally equipped)... it will give you the answers you are looking for.

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Re: Sailing Efficiency Ratings????

Thanks. Never new these things existed. That's what I wanted to know. Thanks!

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post #9 of 9 Old 08-08-2013
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Re: Sailing Efficiency Ratings????

I ha ent could polar plots for the Santana 30 using Google, but if you send an email to WD Schock they might be able to dig something up for you. The best polar plots are the ones that are developed by boat owners who race, but you would be hard pressed finding one of those for boats as old as ours.

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