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Fishhawk
Joined: 18 Mar 2007 Posts: 245 City/Region: Bon Secour
State or Province: AL
C-Dory Year: 2006
C-Dory Model: 22 Cruiser
Vessel Name: Osprey
Photos: Osprey
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Posted: Fri Jun 26, 2009 10:43 am Post subject: |
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O.K. Snal,
Osprey's props are stock Honda Cx11.1x13"s.
There seems to be a lot of doubt out there with this issue so the next time out I will run another test and report RPM as well. Since she does come out on plane I suspect I will see quite a few more RRR"s than the others are turning.
It may not be important but Osprey has no bottom paint and is always freshly waxed.
I am also now wondering if the water chemistry/quality has anything to do with this. It is very surprising to me that so many other 22's can't get up with a single 40-50 hp engine. _________________ "We intend to alleviate global warming's effects of raising ocean water levels by removing enough fish to counteract it all! "
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Cosmic C
Joined: 10 Feb 2004 Posts: 97 City/Region: St Lawrence River & Bucks Cty
State or Province: NY
C-Dory Year: 2002
C-Dory Model: 25 Cruiser
Vessel Name: Cosmic C
Photos: Cosmic C
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Posted: Fri Jun 26, 2009 10:48 am Post subject: |
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Captain Matt, if you had had only one engine you need not have aborted your approach. Engine to neutral, hard over to starboard, quick burst of power (enough to give a little rearward motion and swing bow to port), neutral again, hard to port, modulated power to maintain bow swing.... Since the turning center of a C Dory is pretty far aft, one can pivot the boat quite well with one engine with only a little fore and aft motion on the water. Takes more effort than with two engines, but it can be done. |
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snal
Joined: 13 Aug 2006 Posts: 524 City/Region: Asheville
State or Province: NC
C-Dory Year: 1994
C-Dory Model: 22 Angler
Vessel Name: Thelma Lou
Photos: Thelma Lou
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Posted: Fri Jun 26, 2009 11:00 am Post subject: |
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Quote: | Osprey's props are stock Honda Cx11.1x13"s. |
Mine are 11.25 x 13 and typically WOT at 5700-5800 _________________ Snal~
(Larry and Jo)
1994 C Dory 22 Angler (sold 2012)
Currently looking for a steal of a deal on a 25' "Thelma Lou II" |
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matt_unique
Joined: 27 Feb 2007 Posts: 1881 City/Region: Boston
State or Province: MA
C-Dory Year: 2007
C-Dory Model: 255 Tomcat
Vessel Name: Napoleon
Photos: Napoleon
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Posted: Fri Jun 26, 2009 11:15 am Post subject: Single |
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Cosmic C wrote: | Captain Matt, if you had had only one engine you need not have aborted your approach. Engine to neutral, hard over to starboard, quick burst of power (enough to give a little rearward motion and swing bow to port), neutral again, hard to port, modulated power to maintain bow swing.... Since the turning center of a C Dory is pretty far aft, one can pivot the boat quite well with one engine with only a little fore and aft motion on the water. Takes more effort than with two engines, but it can be done. |
Hi Cosmic,
I think your description above is a great idea with sufficient time/space. There may not have been sufficient time/distance for this procedure to work under the particular circumstance I described above. Turning to starboard with the wind gust blowing me into the dock coupled with my forward movement would have risked going into the dock. The reverse power on the starboard engine without having to touch the wheel was an advantage in that situation. _________________ Captain Matt
Former owner of Napoleon (Tomcat) Hull #65 w/Counter Rotating Suzuki 150's. |
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Cosmic C
Joined: 10 Feb 2004 Posts: 97 City/Region: St Lawrence River & Bucks Cty
State or Province: NY
C-Dory Year: 2002
C-Dory Model: 25 Cruiser
Vessel Name: Cosmic C
Photos: Cosmic C
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Posted: Fri Jun 26, 2009 12:25 pm Post subject: |
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I'm sorry I didn't make myself clearer, Captain Matt. I was thinking single engine C Dory versus a twin C Dory or Tomcat, not a Tomcat running on one engine (which I would think would be a handful in adverse conditions). While I agree that having two engines on any boat does make manoeuvering easier, my point is that there are techniques which allow one to manoeuver a single engine boat as well as a twin under most circumstances, even if they do sometimes require some quick helm and throttle changes. By the way, after 10,000 miles in my faithful CD25, I can still say that the only boat I lust after is a TC255 (but not because it has two engines!). |
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starcrafttom
Joined: 07 Nov 2003 Posts: 7896 City/Region: marysville
State or Province: WA
C-Dory Year: 1984
C-Dory Model: 27 Cruiser
Vessel Name: to be decided later
Photos: Susan E
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Posted: Tue Jul 21, 2009 12:37 pm Post subject: |
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some thing I have noticed on several boats with twins. Its easier to turn on twins in a tight space if you just use the engines forward and reverse and not the steering wheel. if you want to turn left then forward on the left motor and reverse on the right WITHOUT turning the wheel. _________________ Thomas J Elliott
http://tomsfishinggear.blogspot.com/ |
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Sea Angel
Joined: 29 Dec 2003 Posts: 736 City/Region: Virginia Beach, VA
State or Province: VA
Photos: Sea Angel
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Posted: Tue Jul 21, 2009 4:01 pm Post subject: |
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The one drawback to the twin setup I see on my CD25 is that there
is not a counter rotating OB below 135hp. The 90hps are both CW and the
turning response is greatly influenced. As much as I practice and add to
my experience, I will get caught by the preverbial cross current &
opposing wind situation. I just plan for worst case and approach
accordingly... very slowly.
Art _________________ Art ka1rx
CBRAT #208
2005 CD25 #075 SEA ANGEL (SOLD)
USCGAUX (RET), USN(RET)
Broadcast TV ENG(RET)
ka1rx@verizon.net
SKYPE: Art.Bartlett4 |
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tpbrady
Joined: 08 Feb 2005 Posts: 891 City/Region: Anchorage
State or Province: AK
C-Dory Year: 2005
C-Dory Model: 25 Cruiser
Vessel Name: Bidarka II
Photos: Bidarka
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Posted: Tue Jul 21, 2009 8:50 pm Post subject: |
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Starcraft
Don't you mean reverse on the left and forward on the right to rotate to the left. I've never had twins to work with but that would seem to be the way. _________________ Tom
22 Cruiser Bidarka 2004-2009
25 Cruiser Bidarka II 2010-2013
38 Trawler Mia Terra 2012-2015
42 Nordic Tug 2015-
28 KingFisher 2009-2014
14 Jetcraft 2000-
17 Scanoe 1981- |
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starcrafttom
Joined: 07 Nov 2003 Posts: 7896 City/Region: marysville
State or Province: WA
C-Dory Year: 1984
C-Dory Model: 27 Cruiser
Vessel Name: to be decided later
Photos: Susan E
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Posted: Tue Jul 21, 2009 8:56 pm Post subject: |
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from one tom to another "thank you" . Got my right wrong that time. |
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hardee
Joined: 30 Oct 2006 Posts: 12633 City/Region: Sequim
State or Province: WA
C-Dory Year: 2005
C-Dory Model: 22 Cruiser
Vessel Name: Sleepy-C
Photos: SleepyC
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Posted: Wed Jul 22, 2009 10:44 pm Post subject: just like to look around |
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Tom and Tom,
It'll work both ways, in doing it the first way, you will get to see the surroundings in a 450 degree turn , taking in all the sights. In the second, you will only spin 90 degrees , but will miss all that scenery
Sometimes I just like to look around ,
Harvey
SleepyC _________________ Though in our sleep we are not conscious of our activity or surroundings, we should not, in our wakefulness, be unconscious of our sleep. |
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Fishhawk
Joined: 18 Mar 2007 Posts: 245 City/Region: Bon Secour
State or Province: AL
C-Dory Year: 2006
C-Dory Model: 22 Cruiser
Vessel Name: Osprey
Photos: Osprey
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Posted: Tue Aug 11, 2009 11:23 am Post subject: Single 40 hp Speed/RPM Test Results |
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O.K. all,
We had Osprey out on Lake Superior yesterday evening. I ran the tests that I promised and here is what happened:
With one Honda 40 in the water, about a 3 mph tail breeze, flat 52 deg. water, 10-15 gals of fuel, 420 lbs of people, and trolling gear, by no means a heavy load, and if I am to believe my electronics, we achived 16.1 mph at 4600 rpm. WOT.
No B.S.
With both engines WOT we achived 34.5 MPH at 5500 rpm.
So there you have it. My earlier claim of 17-18 mph with one engine was either incorrect or with a lighter load.
If she is an exceptional boat, that's OK with us!!!
Regards,
Capt Dan |
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Don and Brenda
Joined: 22 Feb 2009 Posts: 588 City/Region: Camano Island, Wa
State or Province: WA
C-Dory Year: 2011
C-Dory Model: R-27 Tug
Photos: C-Quest
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Posted: Tue Aug 11, 2009 11:50 am Post subject: |
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Capt Dan
That is still pretty impressive with the load and maintaining 16mph, I assume you were on plane with that speed |
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Fishhawk
Joined: 18 Mar 2007 Posts: 245 City/Region: Bon Secour
State or Province: AL
C-Dory Year: 2006
C-Dory Model: 22 Cruiser
Vessel Name: Osprey
Photos: Osprey
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Posted: Tue Aug 11, 2009 1:33 pm Post subject: |
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Don,
Yes, to attain that speed the boat needs to be planing or "on step" as some have said.
I have had trouble understanding why some others with 45 and 50 hp. engines are unable to do it. It has to be one of three things or a combination of them. Prop pitch, a heavier load, or no trim tabs.
I don't think there could be that much difference between the boats.
Dan |
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Sarge
Joined: 12 Mar 2007 Posts: 488 City/Region: Edmonds
State or Province: WA
Vessel Name: Sea Badger
Photos: Gigi
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Posted: Tue Aug 11, 2009 1:51 pm Post subject: |
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I have twins and one piece of advice I was given regarding rotating the boat on its axis that I found very helpful (and obvious in hindsight, but yours truly didn't figure it out) was that you need to keep the motors straight when applying forward and reverse thrust simultaneously. If you turn the motors, it throws the process out of alignment.
Yes, I'm embarrassed to admit it, but if I can help some other poor soul I'm happy to oblige.
_________________ -Sarge
2001 2150 Bayliner, sold
2007 CD25, sold
2007 Harbercraft Kingfisher 2850, sold
2011 Stabicraft 2250SC, sold
2011 Eastern 18cc
Blog: http://theseabadger.wordpress.com |
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drdosmith@aol.com
Joined: 07 Sep 2018 Posts: 1 City/Region: Minneapolis
State or Province: MN
C-Dory Year: 2001
C-Dory Model: 22 Classic
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Posted: Sat Sep 08, 2018 6:27 am Post subject: |
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I like twin engines. They look great. Sort of like a truck with big knobby tires. _________________ David |
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