Looking for 26’-28’ power catamaran sport fish plans!

Sorry, new to the website so I hope I’m posting this in the right section. I’ve been scouring the internet trying to find building plans for a large wooden power cat. I recently came across a design I really like but when looking into it further it just lead to dead ends. Does anyone know where I can find some plans like the one below? Or a designer to point me to that could come up with some plans for me? Thanks!

RIDER SF27 - Sport-fishing center console boat / catamaran / outboard / twin-engine by RIDER MARINE | NauticExpo https://www.nauticexpo.com/prod/rider-marine/product-35925-497909.html

 

Probably not a lot around for ply construction. The stepped hulls are probably a complication better avoided. This is one that might interest you, they also have a 30 footer in the menu at top left:
BoatPlans.com http://www.boatplans.com/cgi-local/shop.pl?cart_id=daa1b721e399b55946f1e7220af46dca&type=item&categ=023&item=1105802689

 

I should say the hull shape in those plans is pretty well proven, may not be the last word, but will give tradesman-like performance, even if looking a little dated. I note there is provision to extend the beam, I can't see any reason the length could not also be extended 2-3 feet without much of a problem.

 

You could try the plan section at boatbuildercentral.com They may have something to offer you.

Richard Woods of Woods Designs

www.sailingcatamarans.com

 

We did a lot of such cats, but they are all in composite, can be built in sandwich panels. And plans are not for 100$, of course.
One on photo is 9m, designed as expedition cat for Far East Russia, the boat can be pulled up on shore by winch, quite robust and seaworty design with high payload capacity.

 

The link for Rider Marine on the Nautic Expo site is incorrect - this link should find their 28' power cat.
CS28 http://www.rider-marine.fr/catamaran-cs28.html
However they make no mention of plans being available.

Richard is too modest to mention his own power cats - his 30' sports fishing cat would be (in my opinion) be a better bet than the 28' Rider Marine Cat - and the fuel efficiency should be much more economical
Sailing Catamarans - Jazz 30 fishing, day charter or cruising http://sailingcatamarans.com/index.php/designs-2/6-powercats/438-jazz-30-fishing-power-catamaran
Ok, it shows a small cuddy cabin on the bridge deck instead of a centre console helm station, but this could be easily changed.

 

He is probably looking for more speed than Richard's displacement cats, for a day fishing boat, transit time can become an issue if the fishing grounds are far from base, or moving around between spots during the day, would eat up too much time. The displacement cat would be a good troller though, and ideal for fast trolling.

 

I'd rather be in a wider displacement cat and run longer.

I'd build a Wood's Jazz 30. Fast build; max out the engines to Richard's wishes and maybe get close to 30mph lightship. A 150 mile canyon run is 3 hours, but only IF you can do 50.

The extra 20 mpg are not likely gonna happen in 6 foot chop and fast seas anyhow.

 

+1 re Fallguy's comments above.
Re 'looking for more speed', Nathaniel, what speed are you looking for in your boat?
Richard notes on his website re his 28' Skoota that :
"It is fitted with twin 20hp outboards and will motor at 16 knots, or cruise at 12, when it then uses between 5-7 mpg fuel. As it has been so successful I have used a similar hull shape on the Jazz 30."
He follows this up with
"The Jazz is lighter and longer than the Skoota 28 and, with less windage, will have relatively less resistance, so will clearly be a faster, more efficient boat."
I am thinking that if Jazz has (say) a pair of 70 hp O/B motors she should be able to cruise at 20 - 25 knots easily?

The cat in my avatar has displacement hulls which are very skinny (L/B ratio on the waterline is approx 14). She is 49' x 16', and when she was first launched 19 years ago she did 16 knots at full speed with a pair of 70 hp O/B's. She is still working well today, and now has a pair of 150 hp O/B's, which will give a max speed of 26 knots. On both trials there were approx 10 people on board.

I see that Hatteras and others build large (50'+) monohull sportsfishing boats that can do 40 knots - there seems to be a real obsession nowadays for speed to reach the distant canyons offshore. Which is fine if you have a couple of million $$'s to burn, but even a 28' planing cat would probably be looking at cruising speeds of 25 - 30 knots at the most (?), and even so, the seas would probably have to be reasonably calm(?).

 

Any decent planning cat will be able to maintain 25 knots cruise, in average offshore conditions, which is probably optimal planing speed anyway, the optimal cruise for a displacement cat of similar proportions, would be maybe 15-16 knots. If your day covers 100 nautical miles (not unusual), you are talking two hours additional time in transit, out of a 10 hour day on the water, you have cut the fishing time by one-third.

 

High teens I would think, with 70's, otherwise the fuel burn would escalate. maybe 25 knots flat-out, but that isn't practical usage.

 

The Jazz 30 will do 25 knots; probably pretty comfortably.

No planing cat is gonna run 140 hp total.

The fuel burns can't be that different for say a couple of 150s.

So all you get is faster for more fuel if conditions allow.

 

You don't run outboards at full throttle and get good results of any kind. And the motions of a wide beam displacement cat, at top speed, could become a problem in certain conditions. But it is the inability to reduce wetted drag that kills them at higher speeds. It all depends on how far you are going, in a day boat. But I think displacement cats are generally a very good idea.

 

I dunno, I rather like a 14' beam for fishing. (Jazz 30)

Or my build is 16.5'. Skoota 32 dm

No planing cat offers that in 10m that I know of..

 

That's right, the wide beam leads to jerky movements in certain wave conditions, worsening with speed.