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#391210 - 03/24/08 12:44 PM Re: IPS Center Console [Re: seabuddy]  
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KCook Offline
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Post about IPS for high performance designs over on YF -

> YACHT DESIGNERS > Yacht Renderings & Plans > Lars Modin Design IV

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#391973 - 03/26/08 10:02 AM Re: IPS Center Console [Re: KCook]  
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seabuddy Offline
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If a diesel, as in this case, has a good continuous cruise rpm at say 3,200 rpm, and an O/B at say, 4,000 to 4,500 rpms, maybe the mph is about the same and the fuel burn is lower with a diesel plus one has perhaps a better fuel burn at the 3,200 rpm than the 4,000 to 4,500 rpm.

Last edited by seabuddy; 03/26/08 10:05 AM. Reason: spelling
#391978 - 03/26/08 10:17 AM Re: IPS Center Console [Re: seabuddy]  
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I think seabuddy makes good points but brings up too many variables.

First off, a diesel engine of any HP range is always going to burn less fuel than a gas engine. Diesel fuel has more BTU per oz than gas does.

Secondly, the lower RPMS does increase the efficiency of the engine by decreasing the pumping inefficiency of higher RPMS.

But...there's a catch to this argument in this situation. The O/B weight a mere fraction of the what the IPS systems weight and the weight is distributed on the stern, not midship. It is therefor possible that the O/B model has less wet area of the hull at cruise because of the weight distribution and trim capabilities. This increased wet area of the hull will decrease whatever the efficiency gains for the diesel engine.

But, the IPS system is using dual-prop drives, which are more fuel efficient.

I think we're purely speculating on fuel savings. I'm guilty of that train-of-thought in my first post. I'm now not convinced there will be substantial fuel savings.

I do however think it will have better handling characteristics in rough seas, easier docking, and better high speed turning.


-YOLO
#391982 - 03/26/08 10:35 AM Re: IPS Center Console [Re: D-Rod]  
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 Quote:
This increased wet area of the hull will decrease whatever the efficiency gains for the diesel engine.



Do you know that for a fact? In theory, which is what I believe you are stating, it makes sense. But, the hull in many cases is specifically designed for the IPS drives, and the thought process going into the design takes into effect the amount of wetted surface, and is designed accordingly to minimize said wetted surface as much as possible. Thus I don't think you can confidently say that the efficiency gains of the diesel power will be decreased solely due to the "unknown" wetted area of the hull, providing the hull was specifically designed for the IPS drives.


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#392006 - 03/26/08 11:34 AM Re: IPS Center Console [Re: Capn Morgan]  
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How about the value of the weight balance in giving a good ride such that even the Fishermen holding-on "up front" can take the motion for a long fish trip?

#392020 - 03/26/08 12:01 PM Re: IPS Center Console [Re: seabuddy]  
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KCook Offline
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Again, I think ride will matter mostly to convertible and express shoppers. The tournament CC guys all go in the back and hang on for dear life.

These arguments could work for the recreational CC market. But this particular builder, SeaVee, has always catered to the hard core market. Maybe this is a whole new direction for SeaVee. Will be interesting to see.

Kelly

#392032 - 03/26/08 12:31 PM Re: IPS Center Console [Re: Capn Morgan]  
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D-Rod Offline
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 Originally Posted By: Capn Morgan
 Quote:
This increased wet area of the hull will decrease whatever the efficiency gains for the diesel engine.



Do you know that for a fact? In theory, which is what I believe you are stating, it makes sense. But, the hull in many cases is specifically designed for the IPS drives, and the thought process going into the design takes into effect the amount of wetted surface, and is designed accordingly to minimize said wetted surface as much as possible. Thus I don't think you can confidently say that the efficiency gains of the diesel power will be decreased solely due to the "unknown" wetted area of the hull, providing the hull was specifically designed for the IPS drives.


I'm just in theory mode and I was assuming it was the same/similar hull design (which presumably would not be optimized for IPS)


-YOLO
#392045 - 03/26/08 01:19 PM Re: IPS Center Console [Re: D-Rod]  
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Capn Morgan Offline
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No problem. Discussions are good for the soul.


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#392048 - 03/26/08 01:30 PM Re: IPS Center Console [Re: Capn Morgan]  
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D-Rod Offline
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Maybe I can learn from you? \:D


-YOLO
#400095 - 04/25/08 08:52 AM Re: IPS Center Console [Re: D-Rod]  
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seabuddy Offline
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Is it how fast you cruise inside the bay or how fast you cruise in an open body of water?

#400139 - 04/25/08 10:54 AM Re: IPS Center Console [Re: seabuddy]  
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KCook Offline
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I think most of SeaVee's past owners would simply have their boats nailed in both cases.

Kelly

#400322 - 04/26/08 02:33 AM Re: IPS Center Console [Re: KCook]  
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seabuddy Offline
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For a hundred miles out to a Fishing Hole, Fish, and then hundred miles back with three on board?

#400523 - 04/27/08 10:23 AM Re: IPS Center Console [Re: seabuddy]  
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KCook Offline
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Very good question. Dunno what the typical distance is for a tournament run.

Kelly

#400567 - 04/27/08 03:19 PM Re: IPS Center Console [Re: KCook]  
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seabuddy Offline
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Off Long Island, NY it maybe 100 plus miles. Off So. Calif maybe the 30 or so miles to Catalina.

#402242 - 05/04/08 08:02 AM Re: IPS Center Console [Re: seabuddy]  
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Or even the backside of Catalina, which is even further.

#403332 - 05/07/08 06:23 PM Re: IPS Center Console [Re: seabuddy]  
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KCook Offline
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Err, to the back side of Catalina at full tilt in a tournament boat would be no biggie I think? After all, the ski guys ....

slow Kelly

#412046 - 06/08/08 08:37 AM Re: IPS Center Console [Re: KCook]  
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seabuddy Offline
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Depends on the weather as its a fair distance.

#412049 - 06/08/08 08:43 AM Re: IPS Center Console [Re: seabuddy]  
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They also run out to San Clemente island another 20 miles past Catalina.

Mark

Last edited by MarkHB; 06/08/08 09:39 AM.

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Golf!! Waste of a good gun range.
#412054 - 06/08/08 09:20 AM Re: IPS Center Console [Re: MarkHB]  
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seabuddy Offline
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I did that in a friend's boat for an extended weekend. Refueled each way at Catalina Island. No landing on San Clemente.

#412055 - 06/08/08 09:38 AM Re: IPS Center Console [Re: seabuddy]  
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MarkHB Offline
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Catch any fish?


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Golf!! Waste of a good gun range.
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