Carsten,
Yes you did understand me correctly, the soft water ballast ratio is indeed high in this example. However, the response indicates to me that I understand the principles much better than when I started out. The target range you mention of 20 to 30% of dry weight for a sea boat is extremely helpful, thank you. I am still learning, with help from those such as yourself, what is and what is not possible.
I am trying to work the numbers for a dry ambient boat that would be large but still be trailer able. It will take me months but if I will post schematics when I have what I believe to be a practical solution. See the link below to follow my train of thought.
Thank you
Joe Perkel
Miami, Florida
Rick,
Same as above, the numbers represent a new upslope in the learning curve for me. They are indeed lopsided as you and Carsten point out, but they are in the theoretical ballpark if not a practical one. Exomos (see the link) has a submersible "surface" yacht (Proteus) that has a displacement of 45 tons. They do not specify if this is submerged or not but the thing does 25 knots on the surface.
I don't want to go 25 knots, but I suspect that the dry weight to ballast numbers look something "like" my example in order for it to plane at that speed.
To answer your question about size, whatever is possible for a crew of three in relative comfort?
Thank you as well.
Myles,
Dry weight and displacement are not the same thing. I appreciate the effort however.
Thanks