Sea Strike 18


For our builders we offer full size printed bulkhead/ frame patterns, printed on 24" wide paper which are taped together to provide fulls size outlines. Using the full size patterns and detailed plan sheets, the parts can be accurately marked and cut out. All Plan sheets are printed on Architectural D (24" x 36" ) paper except for the full size frame patterns. 

We are presently changing our plans from paper format (where they were sent out via the post),  to PDF download instead.
So please bear with us as our plans will be unavailable for a short time.  


- Overall Hull length ......18 ft ( 5.5m)
- Beam ...... 7ft-2" (2.2m)
- Deadrise @ Transom ...... 23 degrees
- Engine shaft length ...... XL/S (25")
- Recommended Hp ...... 120-150 Hp
- Fuel Capacity ...... 200 litres ( 52.88USG)

- Construction …. Epoxy Fibreglass Plywood Composite Construction

We do not provide CNC files for this design

The Sea Strike 18 is a true player and built big to handle any conditions Mother Nature throws its way.

With her deep-"V" 23 degree variable dead rise hull and utilizing the same high performance and fuel efficient hull design as its smaller sister the Sea Strike 16, the Sea Strike 18 is designed from the ground up, delivering everything the passionate offshore fisherman or family day boat demands... plus more.

Features include a live well, enormous total fish box capacity, walk through transom, a huge cockpit area aft and large casting platform forward for where all the action is on your offshore fishing rampages, wide side decks for all your rod holders, side pockets and more and a 200 litre fuel tank for those long offshore runs. And for those family day outings, it even has the option for a bow rider seating arrangement.

With our tournament-proven hull design, delivering top-end speeds, superb economical cruising speeds and great handling through a variety of conditions and a ride unlike any other, the Sea Strike 18 comes with more standard equipment and unique, pro-level fishing features than any boat in its class.  Coupled with her deep v hull, the Sea Strike 18 will get you there faster, drier, and smoother than the rest.

Pete’s from Albany (Western Australia) Comments:

My boat building journey began a little over 2 ½ years ago. I started off by researching aluminium boat kits. I quickly came to the conclusion that my welding skills would need to be improved, and both my welding and metalwork equipment would need a serious upgrade (which in essence meant a substantial financial injection) to get to the point where I would feel confidant to undertake that project.
Not to be discouraged, I began to look at alternative building materials and methods more suited to my skills and tools. I came across Bowdidge Marine Designs whilst Googling. The modern performance driven boats immediately caught my attention, and a subsequent not-so-quick telephone conversation with Mark soon had me convinced that one of his designs would be the boat I would build… the hard part was going to be choosing which design.

I had pretty much settled on the Sea Strike 16 but expressed to Mark that I thought a larger version would be more suitable to the conditions we experience here on the southern tip of WA. Much to my delight, Mark said that he was going to design a Sea Strike 18. I received the Sea Strike 18 plans mid October 2012, and although I had never used epoxy and fibre glass before (let alone build a boat) I was given the confidence to tackle such a large project with the help and encouragement from the other members of the BMD Forum, and the wonderful support and assistance from both Mark and Debbie.

My brother and I began marking out and cutting all the parts soon after. The next step was the first bit of epoxing and glassing. With this task successfully under my belt, I slowly progressed thru the build, adding to my skill-set, and sharing my accomplishments, questions, and experiences on the forum. It wasn’t long before I was beginning to feel like a “seasoned pro”.

Consistency was my main focus. I kept reminding myself to not get bogged down in the nitty-gritty details of the whole project, but rather break the project down into small, digestible, repetitive tasks; and to make sure I took enjoyment and satisfaction from each one of these. Also, I didn’t have a deadline to meet, which meant that I could abide by my other motto - “No short-cuts”.
I cannot even begin to come up with a figure of how many hours it took me to complete my boat, but I stuck at it, and because of my consistency, I kept knocking-off the “milestones” - hull stitched together and glassed, bottom side painted, hull flipped, sole down, building complete, painting complete, fit-out complete, and outboard installed.

The 18th December 2014 was the incredibly memorable day my boat was finally launched. With her 135HO ETEC hanging off the back, Grant from GB Marine and I cranked her up. Every aspect of the boats performance way exceeded my and Grants expectations. With her 22 degree deadrise, the ride is superbly smooth and dry, stability at rest is amazing and fuel economy is fantastic. Hole shot and top end speed are simply exhilarating, especially when she hits a top speed of 38 kts! (70kph), as you’re slicing through the waves and an offshore swell. I couldn’t be happier. I have taken quite a few people out, and all have commented on how well she performs. I can assure you that nothing beats the feeling of heading out, effortlessly and smoothly cutting through the swell, in a “kick-arse” boat you built yourself.

Although many people have helped to make my project a reality, I really would like to thank my wife Kylie, my father Ron, my brother Jim, Grant from GB Marine, and last but not least, Mark and Debbie from BMD for designing such an awesome boat.


 The following list of materials is approximate and intended for calculation of approximte costs. We offer no guarantees of accuracy. The list is for all plywood in the construction of the hull, deck and interior. Allowance has been made in the quanties for about 10% wastage. Resin and glass quanties are only approximate.

6mm (1/4") - 11 Sheets
9mm (3/8") - 5 Sheets
12mm (1/2") - 8 sheets
18mm (3/4”) – 4 sheets

RESIN AND GLASS (For coatings and reinforced areas)
Epoxy Resin & Hardener - 168 kg (44 US gal)
400-450gm (12oz) Double Bias - 70 m ( 76 yards)
4 kg (4.4 lbs) glue powder (Cabosil)
4kg (4.4 lbs) Q-cells (fairing Powder)

The materials list above covers all the supplies for the boat as designed.
Useage of materials may vary due to several factors. For example, a experienced builder will use less resin. Our resin calculations are based on a 50% glass content. Options, customization and variations within your build will also effect the bill of materials and outcome.

Its that Easy 

Just about anybody can build a boat using the Bowdidge Marine Design Plywood Composite system. This method eliminates many members that ordinarily require fitting, fairing, and beveling. Thus, it's ideal for beginners. A jigsaw and drill are about the only power tools required. The resulting boat is incredibly light weight, strong, and durable.

This quick and easy boatbuilding method consists of plywood planking panels cut to shape from patterns in the plans which are "stitched and glued" together at the seams. Such a boat can be assembled in a matter of hours after cutting out the parts.

The stitching is done with plastic electrical ties passed through small holes along seam edges. These are zipped tight to hold the panels together. The glue is then applied between the stitching and also on the inside in a cove-shaped fillet along the seams, along the outside and inside. After curing, the "stitching" is removed and the gaps filled. Then the hull is covered in glassed.

Plans for all our designs include instructions, material layouts, and material listings. In addition, the patterns provided are precise, since they're taken from the actual 3D modeling and CAD systems.

Sea Strike 18
Sea Strike 18
Sea Strike 18
Sea Strike 18
Sea Strike 18
Sea Strike 18

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