Catamaran plans, who have I forgotten ?

Not to much spiling, but far more joints to glue and get fair. Hard glue lines and soft foam are a ***** to fair.
How many strip plank hulls have you done ?
I’ve done two fat curvy mono’s in cedar.

 

None. I've restored and repaired lots of boats, all sorts but never built one from scratch. This is why I've been so hesitant. Once the hulls and beams are done I'm on familiar ground and will be fine, it's the first bit that's scary for me.

This is why I turned away from rounded hulls. I figured I could learn to make big flat panels then it's cut to shape, bog sand tape fair paint. Inside bulkheads and furniture same process. Cabins bridgedeck etc. All flat or single curve. In theory it should progress like a production line...in theory.

I THINK everything above the chine on Scorpio/Romany etc can be built from flat panel given he has ply options for all that, so it's just the hull bottom.

I still can't get over how big the hulls on Tamar are. Just huge....As I said I can easily scale up the Saturn hulls to 9.9 and a proportional increase in height and beam. I really must do the work and calculate the displacement in that hull. I am confident I can learn to make flat panels.

I'm fairly confident I can make sound hulls in multi chine. If I can get layups for the cross beams and LAR keels/rudder sizes I am pretty sure I can build a sound boat.

 

The thing about flat panels is unless you go to the trouble of making cast in rebates for the join tapes, which you can do IF you have accurate panel shapes then your lovely glossy gelcoat finish disappears under layers of bog as you attempt to fair in the joining tapes. With a V hull it’s one on the join and one on the gunnel and the transoms, start adding chines and the work starts to compound.

 

I wasn't going to gelcoat it ? I was going to tape fill high build primer final sand paint ?

The Woods boats are 5 panel. Keel chine side so there are 2 joins to fair each side.

Saturn and vardo are similar but vardo is 10.4m Saturn 8.8, and Vardo has a full width bridgedeck cabin, but you can see the hull form.

Sailing Catamarans - Saturn - 8.8m hard chine performance cruiser with central cuddy

Sailing Catamarans - Vardo 10.4m performance cruiser

 

Keel, chine, hull deck join. +transoms.
Use vinyl ester and rebates for the joins and you can gelcoat and save mountains of work and weight.
Foam doesn’t need epoxy like cedar or ply does as you well know.
Epoxy can save you a little weight but fabric doesn’t come in 50 or 100 gram increments so you’ll probably be using same fabric as a VE build.
Epoxy will drive you mad waiting for it to cure before the next step it doubles or triples build time.

 

I budgeted $125k for my boat; total cost was well over $200k and I was the unpaid main labor.

Budget killers...resin, foam laminating supplies, paints, vessel transport was almost $10,000 within a couple hundred bucks, wiring and electronics doubled budget..

Buy a boat or build with plywood. In three months, you can have both hulls done. It'll take you 4-10 times longer for foam. I wish you would believe me. The only issue with plywood is nothing should be screwed to the hull. So ez, you just buy a couple panels of 20 pound or 12 pound foam and if you want to mount a battery box; you place feet under it so nothing penetrates the wood. Any needed thru hulls get overbored and filled with thickened resins and double sealed.

So much faster for a man with challenges, so much easier to fair a hull with light glass; everything is simpler..

I won't keep repeating myself, but a smaller plywood cat can be finished in 18 months or a used on refurbed in 6, then you get to go spend time on the water.. Foam, you may start and get demoralized..

 

Guzzi, it's also worth noting fallguy's boat is remarkably similar to what you are proposing: A 9.75M open deck catamaran with deck pod in hard chine foam/glass. But you already knew that...

 

I appreciate the thoughts.

I can get epoxy for the same money or less than polyester. No idea why I just found a cheap supplier. I've got a pack under the house. Unfortunately I bought it a couple of years ago and I don't know how well it stores. As I mentioned previously I was about to order my bits when I had my strokes. I'd probably be close to finished now if that hadn't happened.

I would LOVE to find a 30-32' open deck cat in glass that I could do up easily and go sailing. Unfortunately there seems to be an army of other people with the same idea and well priced boats go in 60 seconds. I can't compete. I can't just hop in the car and burn over and slap down a deposit.

As I've said before I've owned too many plywood boats. I get seduced by the ideas you have expressed above. The reality is very different. They smell, always. You may not notice it but the boss does. And often even I can tell. As soon as the barrier is breached anywhere the rot sets in. It's no use building a boat quickly if it's awful to use.

As I have said I don't want to build. I know it's going to be a ton of work and miserable. I wish I could find another solution. I would very much prefer not to have a full width bridge deck cabin, but even conceding that finding a boat worth buying seems impossible.

 

Cost to build a boat can be calculated per rule of thumb either by the pound or 2/3 labor and 1/3 material , that will not include toys or add on,s . One article ( 2022 ) has a cost by the pound of around $20 per pound to build a day sailor , I assume total disp . 2017 cost show as little as $14 to $mid 20,s for somw large boats . That's less than $7 per pound excluding labor , so if Guzzie3 is going with a 5500 lb disp. blue water boat , no labor and hold cost down to twice the $7 per pound he comes in a 77k . fallguy,s 32' boat is 4100kg ( 9038 lb ) disp . so at $ 14 per pound it hits his est of 125k pretty well . fallguy I would be interested in what you spent on the base build minus things like solar , is there anyway you could break your build down to by the pound for the base boat you would have bought from a yard ?

 

I just found this (goodness I hate FB marketplace).

Marketplace - 1998 Malcolm Tenet 9.3 | Facebook

I can't find anything about it online. All the Tennant stuff see to be gone.

Looks like poor headroom in the hulls and open bridgedeck cabin. Not ply, possibly strip ?

Anyone know anything or seeing things I'm missing ?

 

Looked everywhere using different search terms and nothing turned up.

Looks interesting, almost like someone has updated it to look more modern?

Maybe OldMulti will come to the rescue.

 

the hull weight came in a bit over displacement; so easier to use 10,000 pounds

I made a cheat sheet for the surveyor.

Epoxy 35k our falldown rate was about 25% wasted to bag, maybe 240 gallons in boat
Beams 3.5k, 38.5
Cores 15k, 43.5
Fiberglass 10k, 53.5
Jig 2k,55.5
Supplies 5k, 60.5
Paints 10k,70.5
Windows and doors 9k,79.5
Glendinning 4.5k,84
Steering 5k,89
Engines n wiring 20k,109
Hardtop aluminum n fab 4k,113
Upholstery 7k,120
Railings 4k,124
Welding and steel 4k,128
Elextronics 20k,148
Labor other 20k.168
Hardware, 5k, 173
Transport, 10k, 183

yes, I only show 183k~this was a conservstive estimate for survey

 

Are those US$ ? and what is the second figure ?

How much epoxy did you use ? I paid about $2500AU for about 200kg. I'd have to check exact price but it was about that.

 

Thank you very much for looking. It looks like there isn't much space in the hulls and the bridgedeck is open at the back. Pretty boat. I have messaged the seller, we shall see.

 

Thanks fallguy , $20 a pound for your boat may be within reason , I have watched enough of your build to know you didn't go bare bones . If you knocked out some of the higher end items , and maybe went with ply $14 per pound + or - might be a good starting point to estimate a boat build .