[Rhodes22-list] Test (Excel Spreadsheet)

[Leland]

Slim,

I was thinking the same thing.

I've never given it much thought, but I believe I've hit 6 knots on a close
reach in less than 12 knots of wind.  I don't remember if the current might
have been with me or I might have had some ballast to help cut through the
chop.  If the spreadsheet is generally accurate for most boats of any size,
you'll need less wind to hit hull speed for any other points-of-sail off the
wind.

I wonder how much wind is "normally" needed for a Rhodes to hit hull speed
at 150 degrees off the wind.

I should take a log out on the boat and start recording this information.  A
description of the varying conditions would be somewhat arbitrary;
especially the column for alcohol level.

Lee



Steven Alm wrote:
> 
> Lee,
> 
> I've never seen a graph for the R22 like the one you're trying to create
> but
> I can tell you that we can reach hull speed and even beyond much more than
> you've calculated here.  I know you already made the disclaimer as to its
> accuracy but your graph shows hull speed only with winds at 16 and 150
> degrees off the wind.  Hull speed can be reached in many more
> circumstances
> than that.
> 
> Slim
> 
> On 9/12/07, Leland <LKUHN at cnmc.org> wrote:
>>
>>
>> Bud,
>>
>> I found a variety of speed calculators, but the only ones I could find
>> that
>> used LWL were for maximal hull speed, which is 5.99 knots for our boat.
>>
>> All other calculators for speed for different points-of-sail didn't
>> consider
>> the size of the boat.
>>
>> Lee
>>
>>
>> Bud_On_Rhodes wrote:
>> >
>> > Lee,
>> >   there is software out in the public domain for computing hull speeds.
>> >  You input a variety of parameters and
>> > will get a first cut/baseline of what a Rhodes should achieve.
>> >
>> > -Bud
>> >
>> > Leland wrote:
>> >
>> >>Oops--assumed it wouldn't work.  Guess I'd better explain a little.
>> >>
>> >>First of all, the boat speed spreadsheet for the Rhodes is not accurate
>> for
>> >>a multitude of reasons.
>> >>
>> >>The data for the Beneteau46 is from their website.  Since its LWL is
>> 40'8,
>> >>its speed should generally be about twice that of a Rhodes.  I divided
>> the
>> >>Beneteau data in two and discovered that one of the biggest
>> discrepancies
>> is
>> >>that the Rhodes performs much better in light air and therefore reaches
>> its
>> >>maximal speed much quicker.  I couldn't figure out an easy way to
>> compensate
>> >>so I simply changed the wind speed to increments of two instead of
>> four.
>> >>Hey--I said it was inaccurate.
>> >>
>> >>The Rhodes will still reach its maximal speed sooner than the
>> spreadsheet
>> >>depicts, but I did notice that the data looks somewhat more accurate as
>> you
>> >>decrease wind speed.
>> >>
>> >>Does anyone know of an easy and more accurate method of predicting our
>> >>speeds?  I understand that there are too many variables to be too
>> accurate.
>> >>
>> >>Thanks!
>> >>
>> >>Lee
>> >>
>> >>
>> >>
>> >>Bud_On_Rhodes wrote:
>> >>
>> >>
>> >>>Lee,
>> >>>  I can read your uploaded xls just fine.
>> >>>
>> >>>-Bud
>> >>>
>> >>>Leland wrote:
>> >>>
>> >>>
>> >>>
>> >>>>Just testing to see if I can upload an Excel spreadsheet.
>> >>>>
>> >>>>Lee
>> >>>>1986 Rhodes22
>> >>>>Crab Alley (Kent Island, MD)
>> >>>>
>> >>>>
>> >>>>http://www.nabble.com/file/p12636553/Speed%2BCalculations.xls
>> >>>>Speed+Calculations.xls
>> >>>>
>> >>>>
>> >>>>
>> >>>>
>> >>>__________________________________________________
>> >>>Use Rhodes22-list at rhodes22.org, Help? www.rhodes22.org/list
>> >>>
>> >>>
>> >>>
>> >>>
>> >>
>> >>
>> >>
>> >
>> > __________________________________________________
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>> >
>> >
>>
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