Hi Josh, Great explanation, thank you!  All your recollections are correct.  
Only, I'm currently boatless...   I have virtually no experience with diesel 
engines hence, my ignorant questions...LOL  So, your (and all others) insights 
and comments are very well received and appreciated! Still searching,Danny 

---------- Original Message ----------
From: Josh Muckley <muckl...@gmail.com>
To: DJ Hawk <djhaug...@juno.com>, "C&C List" <cnc-list@cnc-list.com>
Subject: Re: Stus-List C&C 37+ engine size
Date: Mon, 12 Jan 2015 10:45:36 -0500


When you are experiencing heavy currents and can only go 3 kts to round the 
mark.&#65533; Is that 3 kts being measured by the gps or is it 3 kts measured 
by the speed log?&#65533; It sounds to me like it is 3kts by gps and if so then 
from all of the other listers comments and my own experience a larger engine 
would only allow you to proceed at 4kts.
When people experience a mismatch between boat size and drive train performance 
it is most often experienced in heavy chop.&#65533; I believe there are two 
main factors at work in these "under powered" cases.&#65533;
The first is the diameter of the prop.&#65533; Smaller engines = smaller props 
= less bite in the water and when things get sloppy the prop slips and 
cavitates more.
The second part is prop speed.&#65533; In order to use a smaller engine to do 
the same job the designers will gear it to gain mechanical advantage.&#65533; 
The prop will have to spin faster than its higher powered counterparts.&#65533; 
Faster prop=less bite and closer to cavitation.
When these two factors are at play the speed log will slow disproportionately 
to the gps speed.&#65533; Everyone has probably experienced plunging the bow 
into a breaker and seeing the boat speed come down.&#65533; The question is how 
long does it take go recover.&#65533; These smaller props spinning at higher 
rpm slip and cavitate more so speed recovery is longer.&#65533; If the next 
breaker gets to you before the speed recovers....
Remind me, your boat, Lolita?, has an A4 right?&#65533; Is it direct 
drive?&#65533; If my recollections are correct then you have a couple of things 
that set your experiences apart from what you could expect from a larger diesel 
powered boat such as a 37+, 38LF, or a 40.&#65533; Forgive me if my 
recollections are incorrect.
First is that the gas engines don't have as much low end torque so when those 
breakers come and the boat needs to make up, the engine has a harder time 
coming back up to speed.&#65533;
Second, the direct drive (1:1) means that right from the start the prop has to 
spin much faster and an increase in load at the prop is directly felt as an 
increase in load at the engine.&#65533; There are no gears to help in having 
less low end torque so the prop pitch is much less as well, again meaning more 
cavitation.
Third, being a shorter and lighter boat means that the breakers will cause the 
boat to hobby-horse around a lot more and also push the bow off requiring more 
helm.
All of these factors make for a less comfortable ride and slower progress in 
the thick stuff.
Good Luck,
Josh Muckley
 S/V Sea Hawk
 1989 C&C 37+
 Solomons, MD
On Jan 12, 2015 7:10 AM, "Danny Haughey via CnC-List" <cnc-list@cnc-list.com> 
wrote:
I think my point is; Where we sail there are some pretty good currents and the 
chop picks up quite often.&#65533; Sometimes, you have to make it home heading 
into both.&#65533; That's when you want the extra hp.&#65533; We sometimes have 
guests that get a little nervous when the conditions get exciting and we try to 
get them in as quickly as possible.&#65533; Sure, you can move along at hull 
speed in favorable conditions but, the only time I'd be able to notice that the 
stern dug in a few inches would be in the harbour, sometimes.&#65533; We almost 
never experience flat water and are typically dealing with a 3 to 4 knot 
current.&#65533; Sometimes it is our favor and usually try to time our trips so 
it is.&#65533; But day sailing, I don't really care as much.&#65533; I 
sometimes could only get 3 knots under full power trying to round a mark to get 
into a harbour.&#65533; That can be a little unnerving. &#65533; Danny  From my 
Android phone 


-------- Original message --------
From: Chuck S <cscheaf...@comcast.net> 
Date: 01/11/2015 11:45 PM (GMT-05:00) 
To: Danny Haughey <djhaug...@juno.com>,"CNC boat owners, cnc-list" 
<cnc-list@cnc-list.com> 
Subject: Re: Stus-List C&C 37+ engine size 
 

". . . bigger is better. . . "?&#65533; Is a bigger booty better?&#65533; Will 
a bigger anchor make my sailboat go faster?&#65533;What helps sailing is "no 
engine".&#65533;&#65533; Light means flight.&#65533;Research the brochures and 
look to buy a boat with the "designed right size engine", not bigger.&#65533; 
An upgrade would be a smaller diesel w a turbo.&#65533; Just sayin. Chuck   
From: "Danny Haughey via CnC-List" <cnc-list@cnc-list.com>
To: cnc-list@cnc-list.com
Sent: Sunday, January 11, 2015 7:54:45 AM
Subject: Re: Stus-List C&C 37+ engine size
 Ok well, I guess it is adequate then.&#65533; I just tend to see 40 hp engines 
in most 40 footers. Maybe not be the ideal and will be a bargaining point if it 
comes to that. Bigger is better in this instance I think... Thanks for the 
insights guys! Danny  From my Android phone 
 
-------- Original message --------
From: allen via CnC-List <cnc-list@cnc-list.com> 
Date: 01/10/2015 3:53 PM (GMT-05:00) 
To: Robert Abbott <robertabb...@eastlink.ca>,cnc-list@cnc-list.com 
Subject: Re: Stus-List C&C 37+ engine size 
 
 Our 30-2 has 20 hp Universal and easily reaches hull speed in light to calm 
conditions.&#65533; Originally it was powered by an 18 hp Universal that netted 
16.&#65533;Allen Miless/v Septima From: Robert Abbott via CnC-ListSent: 
Saturday, January 10, 2015 3:41 PMTo: Danny Haughey ; 
cnc-list@cnc-list.comSubject: Re: Stus-List C&C 37+ engine size Danny:
Some say if you have one hp per foot of boat, you are adequately powered for a 
sailboat.&#65533; A 35 hp diesel in a 37+ seems adequate to me.
 Rob Abbott
AZURA
C&C 32 - 84
Halifax, N.S.
 
On 2015/01/10 12:30 PM, Danny Haughey via CnC-List wrote:Hi Guys,&#65533;I'm 
eyeing a 1989 37+ &#65533;but it has a 35 HP universal diesel. &#65533;That, 
seems kind of small for a nearly 40' boat. &#65533;doesn't it?&#65533;Danny

 
 
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