12 foot powercat

The deep Vs in some Hobie hulls (like a H16) are like that for sailing - to replace the daggerboard. I'd use a rounded hull shape - more like a Tornado or H18 sailing catamaran; this will have less drag.

 

Yes I appreciate what you say jon, which is why it would be waste to use a sailing cat as a power boat.
The need is discover the specs best suitable for the purpose - a low power equivalent of a catamaran power racer!
I'm sure a lightweight version of Sabahcats design would be perfect with some mods. It doesn't need to stand pounding from the sea but I understand, according to Froudes law, a longer displacement hull is faster.
But how long is neccessary?

 

Heres another from schionning (attached)

And for my current build, (click on avatar) I will be building something allong these dimensions 4m x 1.7m



http://boatpoint.ninemsn.com.au/boats-for-sale/boatdetails.aspx?R=7602841

I will use Nidacore/epoxy const. to keep it lighter than alloy and smaller outboard (18hp tohatsu or similar)

 

hey i am looking for a convincer cat 10ft if any one got one or got a hotdog power boat 13ft can you email me at uvcoatings@sbcglobal.net

thanks!!!!!!

 

'The deep Vs in some Hobie hulls (like a H16) are like that for sailing - to replace the daggerboard. I'd use a rounded hull shape - more like a Tornado or H18 sailing catamaran; this will have less drag'

After reading into hull design by Malcolm Tennant, I now understand the concept of least wetted hull area and soft chine or rounded hull. The Tornado seems especially suitable, particularly being a DIY boat.
How about - making one Tornado hull, cutting it straight along the keel from stem to stern, closing the cut two halves with straight sides and joining the two halves now at the top with bracing?

Would that not be the lightest cat?

 

You might take someone's old worn out thundercat/zapcat and replace the hulls with aluminum (say similar to a pontoon boat hull). Or perhaps fix the original hulls just enough to use them as inflatable molds for a fiberglass replacement hull (that might still use air inflation for extra rigidity).