Randy,
I too am interested in polars for the C&C 30 Mk 1.
But I'm even more interested in what you think of your wind instrument. How
long did you have to wait for delivery, and is it worth it?
Cheers,
Alan
C&C 30-1 Selchie
-----Original Message-----
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Today's Topics:
1. Re: C&C Polars Again (Jeffrey Nelson)
2. Re: C&C Polars Again (RANDY)
----------------------------------------------------------------------
Message: 1
Date: Tue, 27 Sep 2016 20:07:55 -0300
From: Jeffrey Nelson <jhnelso...@gmail.com>
To: cnc-list <cnc-list@cnc-list.com>
Subject: Re: Stus-List C&C Polars Again
Message-ID: <4ff6bde2-a696-d64a-db4d-34dbf516d...@gmail.com>
Content-Type: text/plain; charset="utf-8"; Format="flowed"
Perfect.
Btw, depending on where you sail, your Speed over water won't ever match.
By doing the math between the two you can determine how much current you are
in and with some calculations how much that is setting you off course. Food
for thought.
On 9/27/2016 7:46 PM, RANDY wrote:
> Speed over ground - the SailTimer App uses GPS to calculate speed.
> And it's showing about 0.75 - 1.0 knots faster than my onboard
> transducer-based speed instrument. Since I trust GPS more, I'm now
> calibrating the onboard instrument to match the speed shown by the app.
>
> I scrubbed my bottom a few weeks ago but couldn't see to get the keel
> (murky marina water), so I'm sure it's not perfectly clean.
>
> Cheers,
> Randy
>
> ----------------------------------------------------------------------
> --
> *From: *"Jeffrey Nelson via CnC-List" <cnc-list@cnc-list.com>
> *To: *"cnc-list" <cnc-list@cnc-list.com>
> *Cc: *"Jeffrey Nelson" <jhnelso...@gmail.com>
> *Sent: *Tuesday, September 27, 2016 3:42:46 PM
> *Subject: *Re: Stus-List C&C Polars Again
>
> Add a dirty bottom at this time of year and they'd work for my boat
> too. :-) Are you using speed over ground or speed over water for your
> baseline speed?
>
> --
> Cheers,
> Jeff Nelson
> Muir Caileag
> C&C 30
> Armdale Y.C.
> Halifax
>
> On 9/27/2016 6:24 PM, RANDY via CnC-List wrote:
>
> Those are a reasonable approximation but they're from a 30E, the
> European edition of the 30, which has a different design from my
> MK I (e.g. reverse transom, different interior, probably different
> displacement), and who knows what sails and what kind of prop etc.
> That boat is apparently fastest on a shallow broad reach,
> probably under spinnaker.
>
> Assuming I can get an accurate set of polars for my boat this
> year, they'll still show lower speeds than the boat's true
> potential, because I have old tired sails including an undersized
> main, and I have a fixed prop. Even so I'd like to get an
> accurate set of polars as a baseline to compare against when I
> have new sails and a folding prop, hopefully next year. Then
> hopefully I can sail the boat to its true speed potential.
>
> Cheers,
> Randy
>
>
------------------------------------------------------------------------
> *From: *"Bill Coleman" <colt...@verizon.net>
> *To: *"RANDY" <randy.staff...@comcast.net>
> *Sent: *Tuesday, September 27, 2016 1:26:24 PM
> *Subject: *RE: Stus-List C&C Polars Again
>
> Can?t you just use the polars given on that site? They have a C&C
> 30
>
> *Wind velocity*
>
>
>
> *6kts*
>
>
>
> *8kts*
>
>
>
> *10kts*
>
>
>
> *12kts*
>
>
>
> *14kts*
>
>
>
> *16kts*
>
>
>
> *20kts*
>
> Beat angles
>
>
>
> 45.5?
>
>
>
> 43.7?
>
>
>
> 43.3?
>
>
>
> 43.7?
>
>
>
> 43?
>
>
>
> 41.3?
>
>
>
> 40.5?
>
> Beat VMG
>
>
>
> 2.55
>
>
>
> 3.08
>
>
>
> 3.46
>
>
>
> 3.8
>
>
>
> 4.14
>
>
>
> 4.39
>
>
>
> 4.53
>
> 52?
>
>
>
> 3.98
>
>
>
> 4.73
>
>
>
> 5.31
>
>
>
> 5.82
>
>
>
> 6.15
>
>
>
> 6.35
>
>
>
> 6.5
>
> 60?
>
>
>
> 4.26
>
>
>
> 5.02
>
>
>
> 5.65
>
>
>
> 6.08
>
>
>
> 6.34
>
>
>
> 6.52
>
>
>
> 6.72
>
> 75?
>
>
>
> 4.51
>
>
>
> 5.3
>
>
>
> 5.94
>
>
>
> 6.29
>
>
>
> 6.49
>
>
>
> 6.67
>
>
>
> 7.02
>
> 90?
>
>
>
> 4.64
>
>
>
> 5.61
>
>
>
> 6.24
>
>
>
> 6.55
>
>
>
> 6.71
>
>
>
> 6.8
>
>
>
> 7.04
>
> 110?
>
>
>
> 4.77
>
>
>
> 5.75
>
>
>
> 6.31
>
>
>
> 6.63
>
>
>
> 6.93
>
>
>
> 7.23
>
>
>
> 7.53
>
> 120?
>
>
>
> 4.65
>
>
>
> 5.63
>
>
>
> 6.24
>
>
>
> 6.57
>
>
>
> 6.86
>
>
>
> 7.18
>
>
>
> 7.75
>
> 135?
>
>
>
> 4.27
>
>
>
> 5.19
>
>
>
> 5.97
>
>
>
> 6.39
>
>
>
> 6.67
>
>
>
> 6.96
>
>
>
> 7.56
>
> 150?
>
>
>
> 3.68
>
>
>
> 4.6
>
>
>
> 5.39
>
>
>
> 6.04
>
>
>
> 6.4
>
>
>
> 6.66
>
>
>
> 7.21
>
> Run VMG
>
>
>
> 3.19
>
>
>
> 3.99
>
>
>
> 4.69
>
>
>
> 5.33
>
>
>
> 5.92
>
>
>
> 6.31
>
>
>
> 6.83
>
> Gybe angles
>
>
>
> 148.1?
>
>
>
> 152.1?
>
>
>
> 153.5?
>
>
>
> 159.8?
>
>
>
> 180?
>
>
>
> 180?
>
>
>
> 180?
>
> Right?
>
> Regards,
>
> Bill Coleman
>
>
>
> _______________________________________________
>
> This list is supported by the generous donations of our members. If
> you like what we do, please help us pay for our costs by donating. All
> Contributions are greatly appreciated!
>
--
Boat_Sig Cheers,
Jeff Nelson
Muir Caileag
C&C 30
Armdale Y.C.
Halifax
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Message: 2
Date: Wed, 28 Sep 2016 01:01:37 +0000 (UTC)
From: RANDY <randy.staff...@comcast.net>
To: cnc-list <cnc-list@cnc-list.com>
Subject: Re: Stus-List C&C Polars Again
Message-ID:
<1953174650.7903608.1475024497641.javamail.zim...@comcast.net>
Content-Type: text/plain; charset="utf-8"
I sail on a reservoir in Colorado. It has neither tides nor currents nor
seas :) Except for powerboat wake, which makes the lake choppy on calm days.
And the occasional wind-driven whitecapped waves when the breeze is really
up.
Cheers,
Randy
----- Original Message -----
From: "Jeffrey Nelson via CnC-List" <cnc-list@cnc-list.com>
To: "cnc-list" <cnc-list@cnc-list.com>
Cc: "Jeffrey Nelson" <jhnelso...@gmail.com>
Sent: Tuesday, September 27, 2016 5:07:55 PM
Subject: Re: Stus-List C&C Polars Again
Perfect.
Btw, depending on where you sail, your Speed over water won't ever match. By
doing the math between the two you can determine how much current you are in
and with some calculations how much that is setting you off course. Food for
thought.
On 9/27/2016 7:46 PM, RANDY wrote:
Speed over ground - the SailTimer App uses GPS to calculate speed. And it's
showing about 0.75 - 1.0 knots faster than my onboard transducer-based speed
instrument. Since I trust GPS more, I'm now calibrating the onboard
instrument to match the speed shown by the app.
I scrubbed my bottom a few weeks ago but couldn't see to get the keel (murky
marina water), so I'm sure it's not perfectly clean.
Cheers,
Randy
----- Original Message -----
From: "Jeffrey Nelson via CnC-List" <cnc-list@cnc-list.com>
To: "cnc-list" <cnc-list@cnc-list.com>
Cc: "Jeffrey Nelson" <jhnelso...@gmail.com>
Sent: Tuesday, September 27, 2016 3:42:46 PM
Subject: Re: Stus-List C&C Polars Again
Add a dirty bottom at this time of year and they'd work for my boat too. :-)
Are you using speed over ground or speed over water for your baseline speed?
--
Cheers,
Jeff Nelson
Muir Caileag
C&C 30
Armdale Y.C.
Halifax
On 9/27/2016 6:24 PM, RANDY via CnC-List wrote:
<blockquote>
Those are a reasonable approximation but they're from a 30E, the European
edition of the 30, which has a different design from my MK I (e.g. reverse
transom, different interior, probably different displacement), and who knows
what sails and what kind of prop etc. That boat is apparently fastest on a
shallow broad reach, probably under spinnaker.
Assuming I can get an accurate set of polars for my boat this year, they'll
still show lower speeds than the boat's true potential, because I have old
tired sails including an undersized main, and I have a fixed prop. Even so
I'd like to get an accurate set of polars as a baseline to compare against
when I have new sails and a folding prop, hopefully next year. Then
hopefully I can sail the boat to its true speed potential.
Cheers,
Randy
----- Original Message -----
From: "Bill Coleman" <colt...@verizon.net>
To: "RANDY" <randy.staff...@comcast.net>
Sent: Tuesday, September 27, 2016 1:26:24 PM
Subject: RE: Stus-List C&C Polars Again
Can?t you just use the polars given on that site? They have a C&C 30
Wind velocity
6kts
8kts
10kts
12kts
14kts
16kts
20kts
Beat angles
45.5?
43.7?
43.3?
43.7?
43?
41.3?
40.5?
Beat VMG
2.55
3.08
3.46
3.8
4.14
4.39
4.53
52?
3.98
4.73
5.31
5.82
6.15
6.35
6.5
60?
4.26
5.02
5.65
6.08
6.34
6.52
6.72
75?
4.51
5.3
5.94
6.29
6.49
6.67
7.02
90?
4.64
5.61
6.24
6.55
6.71
6.8
7.04
110?
4.77
5.75
6.31
6.63
6.93
7.23
7.53
120?
4.65
5.63
6.24
6.57
6.86
7.18
7.75
135?
4.27
5.19
5.97
6.39
6.67
6.96
7.56
150?
3.68
4.6
5.39
6.04
6.4
6.66
7.21
Run VMG
3.19
3.99
4.69
5.33
5.92
6.31
6.83
Gybe angles
148.1?
152.1?
153.5?
159.8?
180?
180?
180?
Right?
Regards,
Bill Coleman
_______________________________________________
This list is supported by the generous donations of our members. If you like
what we do, please help us pay for our costs by donating. All Contributions
are greatly appreciated!
</blockquote>
--
Boat_Sig Cheers,
Jeff Nelson
Muir Caileag
C&C 30
Armdale Y.C.
Halifax
_______________________________________________
This list is supported by the generous donations of our members. If you like
what we do, please help us pay for our costs by donating. All Contributions
are greatly appreciated!
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