The Best Astus 20.5 Alternative

If you are looking for an Astus 20.5 alternative, then you are in the right place!

Having sailed the Astus 20.5 it is a fine boat, but we believe the Adventure 600 offers far more versatility, speed and overall benefits.

The Adventure 600 trimaran is challenging the status quo amongst trailer trimarans, offering cutting edge performance and style for the home builder.

Sport Model

You can buy the Adventure 600 Sports model plans now in large paper format. We are currently creating .dxf files – soon to be available free for all purchasers of the plans to date.

The Sports model is very similar in size to the Astus 20.5 but does not have the small cabin.

The Adventure 600 Coastal Cruiser coming later this year has a cabin and galley area. If you need a cabin, then this is our direct competitor to the Astus 20.5.

Why build the Adventure 600 Sport model?

If you are looking for an alternative to the Astus 20.5, the Adventure 600 Sport model compares very well:

  • The A600 Sport model is approximately 130kg lighter than the basic Astus 20.5 and is still around 80kg lighter than the more expensive infused options
  • You will save many thousands of pounds building your own boat
    • Depending on the exact specification you build to of course!
  • You can camp overnight using a lightweight tent on the trampolines or on the main hull
    • We are currently designing a lightweight trampoline to attach across the main hull

Fast Foiler Model

You can buy the Adventure 600 Fast Foiler model plans now in large paper format. We are currently creating .dxf files – soon to be available free for all purchasers of the plans to date.

You can sail this model without foils exactly as you would the Sport model above.

When required, you can quiclky change the boat by:

  • Adding the front foils through the slots in the floats
  • Swap the standard rudder for the inverted T foil rudder
  • Connect the tiller control for adjusting the rake on the rudder foil
  • Add water!

Now, you have a fast foiling trimaran!

Experience the thrill of the “magic carpet” ride foiling above the waves!

  • Lifting the hulls out of the water reduces slamming and increases speeds
  • Remove the slamming of waves and chop as you glide above them!
  • You can raise and lower the foils and rudder to suit your requirements and conditions
  • Adjust the rake of the inverted T rudder on the fly
  • You can sail in and out of shallow water with the foils raised and deploy them when your conditions suit
    • Getting in and out of the ramp or off the beach is no problem
  • The retracted foils provide much reduced lift but help to stabilise the boat
    • If conditions deteriorate, you can safely manage the speed

The rest of the boat remains exactly the same – sails, rigging, main hull.

A truly multi-purpose boat that does not compromise!

Coastal Cruiser Model

The Coastal Cruiser model is the closest alternative to the Astus 20.5.

This model is under development and we will soon be able to give out more detailed information.

It utilises the same beams, floats and basic main hull dimensions as the other models.

Adding a small cuddy cabin enables under cover stays with a small galley facility making this ideal small, fast cruising trailerable trimaran.

Build from Plans or Buy a Kit?


The paper plans are available and you can cut out the panels yourself.

Many people find this daunting unless they have done it before.

It is actually quite straight forward though. The main issue is having enough space to lay out the panels and then epoxy them together overnight while they cure.

You then assemble the main hull and floats using the tried and tested stitch and glue method.

Buy a Kit

If you are not happy cutting out the panels yourself, we will soon be able to offer kits of all panels. These are precision cut using CNC technology.

This will speed up the process for you to get to the finishing stages and get on the water.

Buy Part / Complete Built Boats

Finally, we are investigating providing part and even completely built boats.

The process and pricing is some way down the road but expect major savings over the Astus 20.5 and other competitors.


We even sell plans for our lightweight aluminium trailer! This is far lighter than the usual steel models.

The boat slides onto supportive bunks that hold the entire length of the main hull.

Roller supports can cause issues long term with pressure points softening the hull so bunks were chosen as our preferred option.

Being much lighter than the Astus and most other trailers makes moving the Adventure 600 far easier and means almost any car can tow this boat.

Boat Mover

Finally, our electric boat mover will be available from the summer 2021 to buy or build.

Large ATV wheels along with huge power ensure you can launch your adventure anywhere!

This has various options to suit your needs:

  • A solar panel to keep the battery topped up
  • Various battery options from lead acid to LiFePo
  • A strong steel box section frame
  • You can order a lightweight aluminium frame to make portability much easier

Contact us

[email protected]

or call

+44 (0)7863 403462

or chat with us now bottom right!

Book your test adventure now!

Skippy is properly home!

We drive the trailer round to our shared rear drive entrance, drop off the newly detachable front of the trailer and drag it round to the second private entrance. We turn him around, put the tongue back on and reverse him onto the drive! Success! We can see the side...

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Test fitting the Tohatsu outboard

So, we have a 3.5hp Tohatsu 4 stroke which we will look to use for launch and retrieval. The prevailing wind is South Westerly so across the launch ramp and with no pontoon available, we will need to drop the boat in the water and then pull it off to the side of the...

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Let the Adventures begin!

Super excited - Skippy was definitely here in the UK ready to be collected, so I headed over to Peters and May to start picking things up. We needed a couple of trips to make sure everything is ok, properly secured and safe to trailer so initially I did two quick...

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(Not) Storing the boat at Lymington Town Sailing Club

The intention from the start has been to store and sail the boat out of Lymington Town Sailing Club which we have been members of for some years. Since contacting them in December 2020 about swapping our Spitfire Catamaran out to use the space for Skippy, it has been...

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Collection date confirmed!

After more delays, it appears that Skippy will finally arrive in the Port of London on Monday 11th April and then hit the road to arrive at Peters and May Eastleigh location that afternoon. We're planning to collect him in a couple of trips on the 12th and 13th as...

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Container lost?

Bugger - just been updated that the Evelyn Maersk ship with the container with Skippy onboard is currently in the Port of Felixstowe BUT our container is either not on there or is just not being unloaded! WTF!?!?!?!? It is now leaving Felixstowe tomorrow morning to go...

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Ever Given container ship blocks the Suez Canal!

Jeepers that was lucky! The Suez Canal got blocked today by the Ever Given container ship operated by Evergreen Marine: This massive ship of the Imabari 20000 design is 400m in length with 59m beam and can hold 20,124 20 foot containers! Interestingly, this is not the...

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Building the lightweight bench seats

Building the lightweight bench seats Talking about the fitting of the lightweight bench seats - lets take a look at the first fitting of the test brackets - the frame is there in the background: The carbon fibre was moulded around the edge of the float and then we...

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South Coast Adventure Race

We're great fans of the small boat Raid races like the Everglades Challenge and the Texas 200, but there is not really much available in the UK for enthusiasts to challenge themselves and their equipment. We're interested in gauging interest in something similar based...

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The Mooring Hitch

The Mooring Hitch Video from the Animated Knots YouTube channel: Pass the rope behind and over whatever you are connecting to. With the tail form a loop so that the tail touches the standing end. Pass a bight of the...

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