Team Scarab Multihulls

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Fran Sneesby

Fran Sneesby lives in S.E. Queensland building multihulls for Yendys Multihulls.

Scarab 18 folding trimaran Part 5

Saturday, January 10, 2009 Christmas and New Year are over. It was wonderful to have a rest and recharge the batteries. But hard to go back to work, even though I love what I am doing. This week the main-hull was taped inside. The second float was removed from the frame and turned over. It was taped inside. The floats were levelled and the bulkheads were trimmed to fit.

float main beam

Two main beams (that hold the folding beams) were built using foam and layers of glass and resin.
The holes for the folding system were drilled before attaching the main beams in the main-hull.

Total time 198 hours

Scarab 18 folding trimaran Part 6

Sunday, January 18, 2009
All the bulkhead were taped in the floats.

float

Floats are now ready for the beams and deck to be added

Total time 233 hours

Scarab 18 folding trimaran Part 7

I have jumped from one job to another in this blog because this is how I work. The object is to have as many jobs going at the same time to avoid wasting time. The main reason for this blog is to show how easy the construction is and how many hours it takes for one person to build this boat.
Instead of precovering the panels for the float deck they are covered in place. The laminate is too stiff to bend in the required curve. Scraps of foam are screwed to the side of the float and the foam bent over and attached through the scrap piece.

float float

The deck is laminated with glass cloth and resin. The deck can be removed when it is ready by taking the screws out of the scrap piece of foam and lifting it off the float. Trim the edge and laminate glass cloth on the underside of deck. Attach the deck with glue and hold down with metal straps until dry. Sand the edges, fair and tape.

float main hull

Bulkheads were tacked in place in the main hull.

Total time 262 hours

Scarab 18 folding trimaran Part 8

Friday, February 6, 2009
Bulkheads and main beams taped in the main hull.

main hull main hull

Built another beam (three beams built now).

Total time 282 hours

Scarab 18 folding trimaran Part 9

Wednesday, February 18, 2009
We live in a pretty remote area and the only internet we have here is wireless which doesn't work when it is raining or too windy. So it's up to the weather when I can post to this blog.
Built another beam (all beams built now).

joining beams

Beams joined to floats. Decks added and floats filled ready to paint.

Total time 301 hours

Scarab 18 folding trimaran Part 10

Friday, February 20, 2009
The ring frame was taped to the main hull, inside and out. The floor was cut to fit and all the lockers cut out. All the foam was dug out onthe edges of the lockers and filled with bog. The centreboard case was taped in.

main hull main hull

I painted under the floor (inside the lockers) because it is hard to paint in these areas after the floor is installed.

main hull main hull

The temporary frame for the cabin top was built and the cabin sides attached. The sides were only temporarily attached because the cabin top will be removed to finish inside.

main  hull main hull

main hull

Total time 356 hours

Scarab 18 folding trimaran Part 11

Sunday, March 1, 2009
Foam was attached temporarily to the cabin sides. The top was then glassed. The edges finished and taped. Undo the straps connecting the cabin top to the hull and remove the cabin top. It is much easier to add the reinforcing at this point rather than work overhead in a confined space. The main hatch was cut out and reinforced. The cabin top was finished ready to paint before it is attached to the hull. The cabin top was attached to the hull. All the plywood surroundsfor the lockers were glued in place.

main hull main hull

main hull main hull

main hull

Total time 406 hours

Scarab 18 folding trimaran Part 12

Sunday, March 29, 2009
The edges of the cabin top were taped. Cockpit seat risers are taped in. Cockpit seats glassed in and transome added. Windows for the cabin and the lid for the anchor locker were cut out.

main hull main hull

main hull main hull

Total time 432 hours

Scarab 18 folding trimaran Part 13

Saturday, April 11, 2009
The edges of the transom were taped. Wooden support for outboard motor glued into the transom. Plywood inside anchor locker to support fore stay attachment. All joints inside cabin taped. Everything sanded ready for filler.

main hull main hull

Total time 470 hours.

The boat is all ready to prepare for painting. The 470 hours does not include building the frames (which I built for the last boat) and the centreboard and rudder blades which were already built). Filling, sanding and painting times depend on the required finish. Some builders like to finish the inside and paint, some just want to get into the water as quickly as possible. I will post pictures as the boat is finished and painted but there will be no more times posted.
The assembly (joining the floats and the beams to the mainhull) also takes some time. I will post pictures as we go.

Scarab 18 folding trimaran Part 14

Sunday, April 12, 2009
The mainhull and floats are ready to paint. There are as many different methods of paint preparation as there are builders. I will describe the method I use.
Because the boat is built with flat panels it is very easy to finish. I used peel ply when the panels were made so they are smooth and require little sanding. Filler is applied in a thin even coat (I use Q cells and polyester resin mixed to a peanut butter consistency). Polyester resin is painted over a small area and while still wet the bog is smoothed on with a metal drywall (gyrock) spreader. Metal is easy to clean and does not react with the resin and you can buy them wide enouth to cover the tape and panels in one go. I found that polyester does not like high humidity and will remain sticky for a long time if applied in the rain. This doesn't happen so much with epoxy. Why builders would use epoxy on a small foam boat at 3 times the cost and the related health hazards is beyond me?
If you are using plywood then the above method works well with epoxy resin.

main hull

Scarab 18

Tuesday, November 3, 2009
I have been busy with many projects lately. The Scarab 18 has been painted and Ray is finishing the boat himself.

folded

hatch

folded

on trailer