12- 13 ft Catamaran RIB w/hydrofoil

[sail4evr]

Does anybody know of any current/active builders of this type? This is a powered dingy/tender Not a sailboat

[Nojjan]

I am sure you have seen the Professor KG Hoppe's HYSUCAT concept, smallest built is around 20ft or so but as small as 12-13 ft sound like taking it too far down in size. It will of course work to some extent but I wonder for what load?

[sail4evr]

I don't really understand your response. I have seen hydrofoils under a chair being towed by a water ski boat. I've seen 10 ft moths, a sailboat on hydrofoils, what is different about a 13 ft boat with hydrofoils? Load should be around 900 kilos.

[Meanz Beanz]

That sounds heavy ! My 24' cat is 900kg and I wouldn't like your chances of getting it up on foils. Moths are as light as a feather and sailed by scrawny fit young lads, not a craft for everyone. I think all that Nojjan is saying is its probably easier to get the numbers to work with a little more size to offset the crew load. The smaller you go the tricker that gets.

[Nojjan]

Thanks MB, that is somewhat clearer than my reply I guess. Yes, a 900kg square block of concrete can be made to run on hydrofoils, but under what conditions ;-), I'm sure that chair was nice and dry when they decided to stop.

Any-who, if it is intended to be practical (maybe not in the scoope here) I would aim at a larger size. Note some of the findings from Hoppe, smaller HYSUCAT's are much harder to balance (LCG sensitive).

But I don't want to dampen your spirit, please continue with your project.

[sail4evr]

So I gather that hydrofoils are not competitive in weight carrying capabilities with a traditional RIB inflatable of 13 ft (3.8m)? Many of which exist in the combined weight plus load of 900 kg. Is that right?

[Meanz Beanz]

I'm talking about sailing boats, if its a power boat and you chuck enough horsepower at it and yeah I am sure its possible. Still sounds like alot of weight in a 13' craft to me, but if you say so... beyond my experience. I could not say much more than that

[sail4evr]

Sorry for the confuision. I'm looking for a 12.5-13 ft dingy/tender hydrofoil for my 44ft sailing catamaran
There are lots of rigid bottom dingys out there with a combined weight plus payload around 900 kilos.

[Steve Martin]

Not a CAT and not with a hydrofoil, but you may like it. Have a look at http://www.africancats.com/boten_inf.asp?boot=48 and then click on "CATALITE RIB Specs" under Specifications. Built by a sailboat maker.

Have a look at http://www.duxboats.com/dux_inflatable_boats.html
The dinghy http://www.duxboats.com/d300specs.html doesn't meet your payload requirements but http://www.duxboats.com/pd400specs.html has a payload of 825 kg (1820 lbs). If you're on the west coast, use http://www.duxinflatableboatsofcalifornia.com/ instead

[sail4evr]

Hi Steve,
Thanks for the links. The dux boats are nice, but very expensive. I have seen similar at http://www.amiboats.com/Advanced%20C...I%20Boats.html
maybe $2,000 less.

[royalray]

Hi
Try Watermarque Marine Ltd on www.worldwatertaxis.com thye have teamed up with Malan Conradie and Globally market the Hysucat range now they do have a small Cat foil tender or try www.hysucatstore.com

Here is a picture taken of a picture in the latest Seahorse magazine. It is a 49er sailboat hull converted to an outboard hydrofoil by one of the employees at Bethwaite Design in Sydney: