Concept to basic line drawings - 40 foot power boat

Hey Dennis,

I posted some renderings of the LS1? I can almost see you bombing up the river!

Doug Frolich

 

It's very good work, Doug. Nice!

Dim.

 

Doug,

I just looked in the gallery, very nice and quick to.

Gary

 

Doug,
All I can say is WOW!
You got this from my drawings? You have absolutely nailed it!
I can also see myself bombing up the river!
WOW!
Dennis

 

Dennis,

I am pleased you like the renderings! I was wondering how flexible you are regarding the engine placement. The issue is getting the CG far enough aft for the target speed. Here is one more shot-- this will be good for the wall.

Doug Frolich
Marshall Yacht Design
Larkspur, Ca.

 

Doug,
I was hoping that the notched transom ( notched enough to keep the props of 42" long Arneson ASD-8's under the swim platform! ) would shorten the running surface and help move the CG aft. Maybe not enough?
Dennis

 

Dennis,

You also have the option of placing a swim platform on the transom 24"-32" or so Back. This would make the length of your notch substantially less. Moving the arnesons closer to the back of the boat, and the props will tuck well underneath the swim platform as not to be a safety hazard during boarding\exit off of the platform.

Ken

 

Have you considered CAL-500 drives instead. They are much cheaper than an Arneson. There is a model without trim with tillers that is lighter too.

 

Ken,
I would like a traditional wood swim platform. I was thinking that the size of the notch would help with the CG problem. Just a thought. I think I'll try to add detail to my cutaway drawing to see how far aft the engines can be moved which should better indicate if and how much of a notch is needed.

Gonzo,
I have not seen the Cal500 drive. I'll surf around and see if I can find some info.

Dennis

 

The CAL-500 is built by Sonny Miller. He is a retired racer and use to set up Formulas, Cary and other high performance boats. His phone number is: 954-257-2284 and 229-776-8831.

 

I looked at the CAL-500 drive. I prefer the Arneson model for it's ability to steer and trim. I haven't gotten prices on the Arneson ASD-8's, but the CAL-500's at $10k plus each are not inexpensive.
I'll let you know what I get quoted on the Arneson's.
Dennis

 

By cheaper I didn't mean inexpensive. We all wish . When you compare prices, see also the difference in weigh. Another difference is that Arneson drives need a hydraulic servo pump, lines and hydraulic control valves. It all costs money and makes the system heavier. However, if you absolutely need them to trim, Arneson is your choice.

 

Dennis,
I would recomend this drive, I think it is more appropriate for the intended speed range, less complex installation, and less expensive.

Doug

 

What kind of a drive is it and who sells and services them?

 

Gonzo,

More info on the drive above can be found at dbdmarine.com.

Doug