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hardee
Joined: 30 Oct 2006
Posts: 12637
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: Sun Aug 24, 2008 2:12 am Post subject: Docking downwing with twins. |
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I have only done this in practice, and have done it a few times that way but have never resorted to doing in from need yet.
For docking in a situation where the wind is coming from the dock towards the boat. I come in to within a boat length or two of the dock, do a 180, to face away from the dock, then back toward the dock using both engines in reverse, until I am almost to the dock, then, because I favor the Starboard side to the dock, will us the stbd engine to hold position, and the port engine to pivot the boat around to the right (stbd) until it is parallel to the dock. May look pretty crazy, but it does work.
By the way, I don't think my twin 40's are mounted wider than normal. And I can turn around in my own length like Tom, I just can't fish like him 
Harvey
SleepyC
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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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Les Lampman
Dealer
Joined: 30 Oct 2003
Posts: 779
City/Region: Whidbey Island
State or Province: WA
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| Posted: Tue Aug 26, 2008 4:18 pm Post subject: |
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| Gregw wrote: | If there is no real advantage in handling with twins, then I think I would go with a single and Kicker. The 4 strokes have become very reliable and the biggest issue I have seen is fuel quality, or just water in the fuel. So unless you have a separate fuel tank for each 40, both motors will have the same fuel problem. With a kicker, the fuel is separate. Weight is also an issue on the 22, from what I have read, the original boat was not designed for the weight of a modern 90hp 4 stroke (and fuel) that is why the 22 rides a little low in the back and benefits so much from trim tabs. Thats why on Ben Toland's latest boat design, the Marinaut 205, the fuel tanks are moved forward, on each side, to better balance the boat.
As far as kicker size goes, what size motor would work best for trawler mode? I won't be in any hurry and will travel at hull speed for a big part of the trip. 15hp?
Thanks again |
Hi Greg,
It's not accurate to state that there's no handling advantage with twins even though they are not far apart. I would say that there may or may not be a handling advantage based on the individual at the controls and what he or she is accustomed to and expects to be able to accomplish. I can do things with the twins that I can not do with a single but that's never kept me from accomplishing what I wanted to do with a single even if the process was a bit different. Truly, it's a personal choice.
Unless you're very lucky water in the fuel won't be an issue in only a single tank; generally if it's in one, it's in the other. Running twins on separate tanks doesn't ensure anything. Sounds good on paper though.
The kicker usually runs off the main tanks but when I rig a boat I set it up so the kicker fuel line retains its quick disconnect feature and can be connected to an aux tank.
The C-Dory 22 was not designed for the weight that is typically installed on the transoms these days. However, a pair of Honda BF40/50s is lighter than a BF90 and kicker which is one of the reasons I've always liked that set up. Until the new BF50/50 "D" models with EFI came out and the weight went up 10 pounds (each) the twin BF40/50s weighed almost exactly what the old BF75/90 "A" model did alone (before adding the kicker). Today one still can not categorically state that a single/kicker is going to be lighter than twins...or vice versa.
A 15hp kicker is way too much kicker for the CD22; something around 8 to 10 hp is a better choice. There's no advantage running the kicker to cruise on as opposed to the main engine. It's there for a back up and it's good for fishing if you need direct control in the cockpit. You also won't realize a fuel savings running on one of a pair of engines speed for speed. So if it's only there for backup then get the lightest and least espensive kicker you can; right now that's the Honda BF8 "A" (Classic) or the Tohatsu/Nissan 8/9.8 (not saying these are the "best" engines, there are lots of really great ones, only that these are the lightest).
Fishing is probably the biggest factor in choosing between a single/kicker and twin installation. If you fish a lot and love to be in the cockpit with direct control you'll appreciate the single with a kicker.
You can't go wrong either way and except to meet your own expectations and needs there's no overwhelming reasons to go one way versus the other; in other words, from an objective technical standpoint both set ups work just as well so it comes down to a personal choice based on what you like and what you'll do.
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Les
www.marinautboats.com |
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CAVU
Joined: 02 Nov 2003
Posts: 665
City/Region: Spokane
State or Province: WA
C-Dory Year: 2002
C-Dory Model: 22 Cruiser
Vessel Name: CAVU
Photos: CAVU
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| Posted: Tue Aug 26, 2008 5:42 pm Post subject: |
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Les,
I troll with my boat a lot and I find that the speed with one engine is about right at 1400-1700 rpm depending on the wind and tide. The engine is very sensitive in that range and it can be very hard to make small speed changes. I am guessing it might be where the carbs are changing from idle to high speed jets? Any way that little irritation might be enough to get me to change to single/kicker if I ever have to repower.
_________________
Ken Trease
22 CD Cruiser, CAVU
Twin 40HP Hondas |
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Les Lampman
Dealer
Joined: 30 Oct 2003
Posts: 779
City/Region: Whidbey Island
State or Province: WA
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| Posted: Tue Aug 26, 2008 6:57 pm Post subject: |
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| CAVU wrote: | Les,
I troll with my boat a lot and I find that the speed with one engine is about right at 1400-1700 rpm depending on the wind and tide. The engine is very sensitive in that range and it can be very hard to make small speed changes. I am guessing it might be where the carbs are changing from idle to high speed jets? Any way that little irritation might be enough to get me to change to single/kicker if I ever have to repower. |
Hi Ken,
That's a tough speed range for sure and it's partly due the normal "slop" (for lack of a better word) in the mechanical linkages in the remote controller, in the throttle cable, and in the linkages in the engine; and you're coming up off the idle circuit.
Another option would be to see how it does just kicking both engines into forward gear at idle. That might give you the speed you want without the fuss and give you a bit more charging capacity as well. I doubt it would change the fuel burn almost at all.
I agree for fishing that a single and kicker is probably the best. I like the kicker with a Troll Master on it which gives very precise speed control. |
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