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Old 30-09-2010, 04:38   #76
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Yeah Bounty Hunter, I notice that a lot of Schionnings and similar custom builds have gone for these. From all reports they appear to work pretty well.
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Old 30-09-2010, 04:56   #77
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Bountyhunter,

If you know of a dealer or have any links/PDF please post, PM or email me.

Thanks
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Old 03-10-2010, 15:50   #78
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I have just got a prout with the sonic leg and Diesel engine. You can lift the leg out of the water and steer 45 degrees off. but the only change i would consider is replacing the motor with an electric one?
Why? well with big cheap photo cells 3 hours high thrust a day is possible every day
12KWH from a lot of cells. A low thrust creep mode for windless days just on photocell power alone. No need to line the deck with jerry cans for blue water. lots of power stored for the weekend when work fills the week.

Well it is an idea now for the advice to come in!

PS keep safe out in the sand box
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Old 03-10-2010, 16:12   #79
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Electric motor drive fed by solar cells just doesn't work. Not only are the solar cells inefficient but storing power in batteries is also inefficient.
Do the numbers?

The only electric drive suitable would be a diesel motor and generator driving the electric motor, but why bother, you are up for twice the cost, and you are still running a diesel. The only advantage is that you can locate the diesel wherever you like. In the bow for example.
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Old 03-10-2010, 16:46   #80
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Check out this hybrid motor cruiser Greenline Hybrid Boat - Model Line Up
use sails when ever possible then if no wind use solar? the math is workable if you try i think.
Hint no wind = calm eventualy. We are not talking speed boat here but sustained cruising
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Old 03-10-2010, 17:19   #81
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Check out this hybrid motor cruiser Greenline Hybrid Boat - Model Line Up
use sails when ever possible then if no wind use solar? the math is workable if you try i think.
Hint no wind = calm eventualy. We are not talking speed boat here but sustained cruising

There is some talk like that.

LiFePO4 Electric Boats

And others.
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Old 04-10-2010, 10:49   #82
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Let's stay on the outboard in place of diesel inboard topic. As Therapy pointed out..there are that and many other threads about electric & hybrid drive. Right now I'm convinced in outboards. Just gotta wait to see if and when I can implement it and what model boat I'm going to purchase.
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Old 04-10-2010, 10:55   #83
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another one for you chief:

Performance Cruising Catamaran 39 foot - The Andaman Cabriolet
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Old 04-10-2010, 11:04   #84
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shipofools,

Thanks for the link. looked at it....although glad the outboards are still used in a production cat. What I don;t likeis:

fabric doors on inside
all open saloon to cockpit

Doug
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Old 04-10-2010, 11:08   #85
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shipofools,

Thanks for the link. looked at it....although glad the outboards are still used in a production cat. What I don;t likeis:

fabric doors on inside
all open saloon to cockpit

Doug
Can always spec it with closed doors in the saloon, and solid doors inside. Even as a production boat there is some customization in the build process I am guessing.

I kind of like it for tropical cruising, think it will have great airflow.

Cheers,
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Old 27-11-2011, 09:11   #86
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Re: Under-40' Cats with Outboards . . . Why Not More ?

G´day fellow cat owners with outboards!

We have a 40´ Kelsall with twin outboards on the inner side of each hull. Access is via the cockpit lockers, ie. you lift up the seat and there is the outboard purring away. The outboards were originally Honds 9.9s but a previous owner in 2004 replaced them with Yamaha 8 HPs.

They cop a fairly rough life located so close to saltwater, never get a freshwater flush etc. Anyway one has now finally died and needs to be replaced.

With the remaining Yamaha 8 HP, it pushes us along at 4 knots in calm conditions and consumes 2 l/hr. The two engines used to do 6 knots together. If we are in a no wind situation, we only use one engine, never both, and just meander along at 4 knots until the wind comes back. We only ever used both engines together for manoeuvering in close quarters. In fact, the dead engine has been out of action for the last 2000 miles, so we have learnt to get by with one, but we were pushing our luck a few times and we need to go back to twins.

For the next engine, I am thinking of the following alternatives.

1. Find another Yamaha 8 HP, so they are truly twins and can share spare parts etc. It is an unusual engine and will not be possible to simply buy off the shelf, so this will take time.

2. Find a 2-stroke motor with more HP. This will be cheaper in the short term than buying another 4-stroke. In terms of just doing miles in calm conditions, the currently working 4-stroke can do that. For high manoeuvarability situations, both engines (a 2-stroke and a 4-stroke) can also work together. If I need lots of power for a very short distance (eg. getting through a pass into a lagoon), the 2-stroke will be better than the 4-stroke.

3. Find any other 4-stroke, longshaft and use that. Higher upfront cost, better fuel economy but what´s the point of that when we already have a 4-stroke in the other well?

So that is where we are. What do you reckon? Should I be thinking of something else? Any recommendations?

Anyone know of a long shaft outboard for sale in Curacao? Or Aruba or Bonaire?
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Old 27-11-2011, 09:32   #87
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Re: Under-40' Cats with Outboards . . . Why Not More ?

the Yamaha 8 is the same motor as the 9.9 except for a 3mm difference in crank stroke. The 9.9 is a very common motor. When you say long shaft I hear 20". I would reccomend an extra long shaft at 25". There is also a company out of Ohio that makes 5"shàft extensions for the complete line of Yamahas. 5" further from the water will make a huge difference in the life of the motor. Honda also now makes a 15 HP in a hi thrust 25" model.
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Old 27-11-2011, 10:37   #88
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Re: Under-40' Cats with Outboards . . . Why Not More ?

David, thanks for the info. I checked out the Honda BFP15DKXRT which looks pretty good - 15 HP, 25" shaft, 61 kg, hi thrust 10" x 7 5/8" prop, remote control, gear ratio of 2.08:1. Just looking for a diagram now of the dimensions to confirm that I can drop it in place. And then need to see if it is available here.

Does the 3 mm difference in crank stroke mean that I could replace the power head on my dead Yamaha 8 with the power head of a Honda 9.9?
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Old 27-11-2011, 11:07   #89
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Re: Under-40' Cats with Outboards . . . Why Not More ?

I believe so.... but I am not an outboard mechanic. This is what I have been told by the Yamaha distributor in Atlanta.
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Old 27-11-2011, 12:15   #90
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Re: Under-40' Cats with Outboards . . . Why Not More ?

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David, thanks for the info. I checked out the Honda BFP15DKXRT which looks pretty good - 15 HP, 25" shaft, 61 kg, hi thrust 10" x 7 5/8" prop, remote control, gear ratio of 2.08:1. Just looking for a diagram now of the dimensions to confirm that I can drop it in place. And then need to see if it is available here.

Does the 3 mm difference in crank stroke mean that I could replace the power head on my dead Yamaha 8 with the power head of a Honda 9.9?
I doubt if you could replace the power head on a yamaha 8 with a Honda one.

Re the Honda 15: The Honda 20 is the same motor - same weight etc, and there's a 28 inch leg version available with the powerthrust prop.
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