CD22 performance

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mattfailor

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Dec 29, 2012
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C Dory Year
2008
C Dory Model
22 Angler
Vessel Name
Ody-C
Wanted to check to see what others experience running one motor with the twin set up. I have twin Honda 50's that are running very good and was doing a little experimenting over the weekend. I was checking the speed of a single engine in the water with the other out and the motor seemed to be acting as it was severely loaded. I was surprised to see I was achieving only in the 10kt range. Do others have an idea of what kind of speed can be achieved while propelled by a single motor? Boat is a '08 Angler and was lightly loaded.
Thanks!!!
 
I'm sure the folks who actually run twins will chime in, but the behavior of your engine sounds "normal" to me. Reason I say that is that you would customarily have each twin propped to function as "half of a set," and that would be different than how you would have the same 50 propped to run as a single engine. In order to run the "half a twin" fast without lugging it, I would think you would need to change props (to the prop you would use if you were running it as a single engine).

Sunbeam
 
Sounds like you are trying to get on plane. If I am on one of my twin Suzi 50's and with the other up, I've never tried WOT because I'm sure it will barely get on plane if at all with the loads I carry and see no point in trying to run fast with one in the water. I only use one when loafing along at 5 mph and when I'm in uncharted rocky waters. I think WOT on one in the water is a shortcut to problems. I agree that if you ran that way a lot off plane you'd probably need to mess with the props. So, WOT on a twin with only one in the water is an interesting academic question, but why would you.
Even when I'm at normal, comfortable, off-plane cruise, and I know I'm not in rock infested water, I keep both down and both running around 8 mph. I can't see any significant difference in MPG, though there may be a little saving, with only one down, running slow. Running two engines under almost any conditions, with the major exception of rocky water, just makes sense to me.
 
Thanks for the replies so far! I always run on both engines unless just trolling at idle. I was just doing a little experimentation to see how I would be able to perform in the event of an engine failure at sea. I figure much better off to know what to expect! Thanks again!!!
 
The few C Dories which were set up with a single 50 had props with lower pitch. Thus the engine was not lugging, as it would when propped for a twins, and run on a single. You are probably not going to get much more than 10 knots, and will not be doing any favor to your engine running faster.
 
I have twin Yami 40s. When I did my sea trial before buying her, I did try one engine up. I think I just about got on plane with one engine. But the boat was completely empty, absolutely nada, no water, and hardly any gas.

I also putter in unfamiliar shallow waters with one engine up in case of a grounding.

Martin.
 
That is normal. Our boat has twin honda 40s and I tried the same thing. We do alot of trolling for salmon with only 1 motor running, but I tried to open it up at least once to see what it could do running 1 engine. RPMs would not go above 4300 or so and I think I was at about 9 or 10 knts. The props are pitched to be run together. At trolling speed it works perfectly though.
 
Mine, with twin 35's, will actually just plane with one engine up. But the rpms only reach about 4800 and it is luggning badly. One experiment was enough. If for some obscure reason I had to plane on one engine it would, but don't know how long the engine would bear it.
 
Like others who run twins, I have experimented with running on a single. Yes I can get up to plane. but barely 10 knots, and if planing already and going to a single with one up one down it will continue to plane, but it is for sure lugging.

My use of a single down is, again like others, in very shallow, or shallow and rocky water when at a slow idle and it is pretty rare.

Love my twins :thup :thup

Harvey
SleepyC:moon
 
Shopping at Costco today. As I was going through the checkout, and the assistant was emptying my cart, he got down to the last two items. Two cases of the old original vegetable juice V-8. He turned to the checker and said, “This guys got the fastest cart in the store.” To which she said “Huh?”. His answer, “It has to be, it has twin V-8’s”

He didn’t really get why I thought it was that funny. He didn’t know about my boat.

Peter, I just really love the redundant duplicity of having two of the same. What, your not surprised :lol:

Harvey
SleepyC:moon
 
I know this thread was started asking about twins. But someone wrote me a while back asking what I was getting with my Merc 115 EFI 4-stroke, so thought I'd add that info here. I didn't have the number at the time, but I just refueled for the first time this season. After 17 hours, I used 36 gals of gas. I'd say 2.1 gph isn't too shabby for my CD-22. I have a Solaris 4 bladed aluminum prop, 13.25 x 13. Usually cruise at 22 mph, or about 4500 rpm. Top speed is just over 30 mph. Do a lot of no wake speed as well. Colby
 
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