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Build Thread - Allied Boats Aluminum Catamaran Hull #1

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Build Thread - Allied Boats Aluminum Catamaran Hull #1

Old 07-17-2020, 12:55 AM
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Default Build Thread - Allied Boats Aluminum Catamaran Hull #1

I inked a deal with the owner of Defiance Boats and Allied Boats for their first aluminum catamaran. Defiance has been around plenty long and the owner is a dedicated fisherman. I think it’s important that the folks in charge of boat building actually use them for their intended purposes as well. They started their aluminum side a few years ago and are making some great boats out here on the west coast (that’s the one with the Pacific Ocean for you folks in Florida). The owner has been wanting to build an aluminum cat for a while, but hasn’t had the right customer sign up for the first build. Kind of like folks want the boats, but they want to see a couple built and how they hold up before dropping a couple $100k on one. Totally understandable. But, it’s tough on a company to build something Like this without a buyer. I’m not the guy that buys year one of a new car design, outboard, etc. Well, not usually...

We got to talking at the Seattle Boat Show earlier this year. He knew that I’m a pretty strong catamaran enthusiast and was in between boats. I’m also a fan of competition, so more cats in the market means better options for consumers. As I said, I’m usually not the guy to buy version 1. I know v2 is likely to be improved and v3 even more so. But, if we don’t get v1 or v2, I won’t see v3. So, we agreed I’d buy v1. Run it as a demo boat for a season, year, or whatever. Make whatever tweaks might be needed (easier to do with it being aluminum), sell as demo boat, and then put that money into building another one.

Worst case, I have what should be a pretty awesome boat for a while and get a few write-offs. Best case, I get a pretty awesome boat for a while, get a few write-offs, and get to keep helping design and create aluminum cats. At least I hope so.

Hull #1 is a 30 x 10 full walk around pilot house with a forward cuddy (bed, head, and lots of storage). The last two cats I’ve had have been 28-29’ x 9’6”. One a CC and one a walk around pilot house. Neither with a place to sleep overnight (other than on the bean bags). Basically, serious fishing and not overly family-friendly. We chose the 30 x 10 because:
-I wanted a bit more space for getting around the cabin
-Get a bit more efficiency and comfort
-There aren’t a lot of options out there for 30’ and the price range (lots of 34’+)
-Pretty reasonable to trailer still
-And, quite frankly, it’s big enough to get me out and back in any conditions I’d actually want to fish. If the conditions warrant a bigger boat to be safe, I really don’t want to be out there trying to fish for fun.

The aluminum is now on order. Virtual is about to become reality.

Some of the specs:
-Twin Yamaha F300s
-Pretty full suite of Raymarine electronics, including FLIR.
-Fully insulated 1/2 tote fish boxes by SMAK plastics mounted below deck. Pretty much every other aluminum boat builder hand builds aluminum fish boxes and they are extremely difficult (and expensive) to properly insulate. We had a pair of these SMAK totes built into my buddy’s 34’ cat (SlapShot) last year and they work awesome.
-Extended walk through transom for boarding and easy access to the props, should someone screw up and catch a 300hp Yamaha, because it’s gonna happen...
-Twin transom tackle stations with top sinks (one being FW)
-Aft corner jump seats
-A removable Defiance live bait tank will take center stage in the cockpit
-Large Freeman deck hatches for aft bilge access into each sponson

-The cabin will seat 6 with 1 or 2 SHOX bottom drop helms seats.
-I wanted a open cabin, so rather than the typical Alaskan bulkhead, it’ll be a 3-piece drop curtain. But, it’s being built in a way that a future buyer can easily have it converted to the Alaska bulkhead with locking door.
-Capt’s side door
-Planar diesel heater
-Intermittent wipers with delay (I hate only having slow or fast options)
-A custom exterior forward bench seat in front of the cabin.

-Probably start with 21 rod holders on the hardtop (7 aft, 6 up each side, and 2 near the eyebrow for casting to jumpers) and 8 on the rails (6 aft and 2 on the bow).
2 tackle trays in each side, with the bottom one also serving as a toe kick.

I think that covers a lot of my thoughts for the build. Chime in with other ideas, as we have plenty of time to make changes. We are expecting a December completion and unveiling at the next Seattle Boat Show.

Hopefully y’all enjoy these current renderings. I’ll keep updating this as we progress.



Good look at the forward bench seat and transom tackle station.


Large deck boxes are the SMAK totes. Dark black oval is the aft Freeman hatch.


Radar mast will fold forward for trailering.


Bit of a peak into the cabin.


Fairly tall sponsons to minimize tunnel slap and sneezing.


Forward bed over tunnel and stbd sponson with head down in the port sponson. Some pretty slick storage areas too.


Location of insulated 1/2 tote fuel tank, transom tackle stations, etc.

Last edited by wdlfbio; 07-17-2020 at 02:01 AM.
Old 07-17-2020, 01:03 AM
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wow I thought I was looking at an aussie built ali sailfisher a very very close design and layout
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Old 07-17-2020, 01:43 AM
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I like it!
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Old 07-17-2020, 06:20 AM
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Nice looking rig.
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Old 07-17-2020, 07:02 AM
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Originally Posted by wdlfbio View Post
-I wanted a open cabin, so rather than the typical Alaskan bulkhead, itíll be a 3-piece drop curtain. But, itís being built in a way that a future buyer can easily have it converted to the Alaska bulkhead with locking door.
-Captís side door
These are good choices. I've considered blowing out the back wall of my pilot house, if you have the right weather for it makes the boat larger. And I don't like driving when everyone is hanging out in the aft cockpit. Also docking can be a struggle when you need to scramble out back, to run around and up to the bow. Door will short-circuit that.

How big is the cabin? Will you have seated head-room on top of the mattress? Mine is about 2" shorter than I'd like, let to a handful of bruises on the noggin.

Do you have any counter-top space in the pilot house, or is it all seating? Comes in pretty useful when over-nighting. Maybe something that folds up or down?

Cool boat!
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Old 07-17-2020, 09:31 AM
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[QUOTE=ozmako;13862409]wow I thought I was looking at an aussie built ali sailfisher a very very close design and layout[/QUOTE

Iíve seen a few of their videos and they have some very cool layouts. This one has the full walk around and I specifically asked to have her designed with the helm a bit further back than most. I figure since I paid the cash for her, Iím staying awake to run her, I should put the helm in a more comfortable place . Plus, it gave the needed room for the berth and fighting fish on the bow.

We have an amazing summer albacore fishery up here. Our typical 6-pack charter folks can run 40-70 miles and have their 6 clients landing 30-60 15-40# albacore in a day. Most on live bait. Being able to fish around the entire boat really spreads out the anglers and reduces the number of braided sweaters they end up with.

Old 07-17-2020, 09:46 AM
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Originally Posted by Matt Gent View Post
These are good choices. I've considered blowing out the back wall of my pilot house, if you have the right weather for it makes the boat larger. And I don't like driving when everyone is hanging out in the aft cockpit. Also docking can be a struggle when you need to scramble out back, to run around and up to the bow. Door will short-circuit that.

How big is the cabin? Will you have seated head-room on top of the mattress? Mine is about 2" shorter than I'd like, let to a handful of bruises on the noggin.

Do you have any counter-top space in the pilot house, or is it all seating? Comes in pretty useful when over-nighting. Maybe something that folds up or down?

Cool boat!
Those are precisely some of my reasons for wanting the open cabin too. When it’s nasty out, drop the curtain. Most morning runs out, the curtain will be down. In both cases, the Planar diesel heater will be running. The Pacific NW coastal temps, even in summer, are like your winter temps. Hahahha

The head has plenty of head room, but I doubt most adult males would be able to sit straight up on the bed. Head room in there is a factor of distance between the tunnel and berth ceiling. We could have lowered the tunnel, but that would have really reduced ride comfort. NOT an option. Or, we could have raised the berth height, but then we are cutting into forward visibility. I did not want to See the berth roof blocking the view immediately above the bow. We have way too much debris in our water, plus crab and shrimp pot buoys, to restrict forward visibility. It’s not like walking down into the belly of a 30’ deep v. We just don’t have that kind of room in this sized cat.

Here is a shot with measurements from some earlier renderings. The cabin is really set up for 6 people. We will have detachable arm rests on the aft end of both bench seats. This will allow anglers to sit on the aft end of the bench, facing aft, in order to more comfortably watch the troll gear. Plus, folks could lay back on the benches when two people aren’t sitting, with their feet out the back of the cabin. I’m considering putting a couple rotomolded coolers of the same seat height aft of those bench seats. That would give “nappers” even more surface for laying across.



This one is shown with the optional Alaska bulkhead, and before we added the bow seat.



Other than the bench seat tops and dash area, no dedicated “work surfaces” inside the cabin. the bait tank will have a work surface and both the tackle stations too.

Last edited by wdlfbio; 07-17-2020 at 09:54 AM.
Old 07-17-2020, 09:51 AM
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I am looking forward to following this thread. OP..... thank you for sharing your build!
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Old 07-17-2020, 10:11 AM
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Any interesting titbits about the hull shape? I see the sponsons are symmetric, so basically the World Cat approach? No steps? How tall is the tunnel?
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Old 07-17-2020, 02:56 PM
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Originally Posted by wdlfbio View Post
They started their aluminum side a few years ago and are making some great boats out here on the west coast (thatís the one with the Pacific Ocean for you folks in Florida).
That's awesome....I hope you have a great time and good success with your build.
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Old 07-17-2020, 04:43 PM
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Sweet. I wish some fiberglass builders would take notes.
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Old 07-17-2020, 05:30 PM
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Originally Posted by Drako View Post
Any interesting titbits about the hull shape? I see the sponsons are symmetric, so basically the World Cat approach? No steps? How tall is the tunnel?

Nothing revolutionary with the sponsons. I gave some consideration to a step(s), but that would certainly have substantially increased my engineering costs for a highly unknown outcome. Plus, because we do have tweaks to some previous hull designs, and there isn’t another rig with this layout, weight, motor choice, etc, we don’t even have a baseline metric to determine if any step(s) had a discernible positive impact.

Our typical run out is heading into a WSW to WNW swell that is 4’ at 8 seconds (on average). That means some 3’ and some 5’, some 6 second intervals and some 10 second intervals. We have lots of periods where we reduce speeds to 23-25 knots so we don’t Drop off the back side of some of the bigger and steeper swells. Then we can pick up and closer to 30-35 knots. How a step(s) and even foil(s) would function in these various conditions just isn’t known well enough for me to risk screwing it up. I’d like to test it, but not with Hull #1 (and preferably with someone else’s money hahaha).

First go, get me the berth, get me the interior seating so we are warm and dry most of the time, get me the buoyancy for 700# of ice, 400# of bait tank water, 8 adults, and 800+# of fresh albacore, and get me some verified efficiencies. Then let’s start talking about playing with other variables.

I actually don’t have the tunnel height in my files. Any particular place you’d like to measure at? I’ll find it and get back to you.

If I recall correctly, the height from bottom to top of the hardtop (not radar mount or life raft valise) is 10’. I know we are cutting it pretty close with keeping it under 14’ on the trailer for comfortable towing. Really don’t want to scrape rod holders off on freeway underpasses. Hahaha.
Old 07-17-2020, 05:57 PM
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I really think the extended platform with rails is an awesome idea that I have seen from a New Zealand boatbuilder called Blade Runner.

It's a great way to work fish around the motors and safe too.


Old 07-18-2020, 12:31 AM
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Very cool. I’ve seen a listing for the Blade Runner With snorkels out this way. Never saw it first hand though.
Old 07-19-2020, 08:55 AM
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Looking forward to seeing this one come together!

I'm up in BC....always on the lookout for a nice Eaglecraft or Coastal Craft myself. I'd love to check out one of your builds some day. Maybe at the Seattle Boat show or over in Westport...hopefully COVID is under control by next spring.
Old 07-19-2020, 09:14 AM
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Nice tastes! Those are great looking rides too.

We absolutely want to boat up your way next winter/spring.
Old 07-23-2020, 03:16 PM
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That is a great looking boat. We have a defiance now and we love it. Not many of them on the east coast, and ours is the only one I've seen where we are. Curious to see how this works out because i've been looking more and more at the allied series...Just not sure about alluminum for tuna fishing off of new Jersey compared to a fiberglass boat.

I'm also not sure the allied boats are really on the east coast, at least not around us. I'd like to test drive something like that before diving in since it seems like the aluminum might be a drastic change from fiberglass for us..
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Old 07-23-2020, 08:53 PM
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Very nice looking aluminum cat. I like the sheer line. Donít think Iíve seen that before on a aluminum cat
keep posting. I really find it interesting.i love the utility of aluminum hullls. Rinse and go home!
they seem very durable and ďnavalĒ
itíd be cool to,paint it grey and put a big number on it like a destroyer
of course I realize its a serious fishing boat
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Old 07-23-2020, 09:33 PM
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Steps are over very rated on catamarans imo.
Old 07-23-2020, 09:36 PM
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Originally Posted by LBIBound View Post
That is a great looking boat. We have a defiance now and we love it. Not many of them on the east coast, and ours is the only one I've seen where we are. Curious to see how this works out because i've been looking more and more at the allied series...Just not sure about alluminum for tuna fishing off of new Jersey compared to a fiberglass boat.

I'm also not sure the allied boats are really on the east coast, at least not around us. I'd like to test drive something like that before diving in since it seems like the aluminum might be a drastic change from fiberglass for us..

thatís funny, cause itís true. Friends of mine brought their 19í North River (great quality aluminum boat) to Rhode Island when they moved from here to there. People looked at them like they were in a space ship. Hahaha. And then they saw it beaching in the rocks, on the oyster beds, going through the ice, etc. Black Lab Boats and Pacific Boats are plate boats a bit more common in the NE (still, rare for the NE). Durable as heck and as said immediately above, rinse and go .

It seems like our ocean conditions are fairly similar to yours. Ping me next year if you find your way on this coast. We will go for a run.

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