gartsideboats.com Paul Gartside Limited, Boatbuilder and Designer

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22 Foot Steam Launch Design #123

Our plan files contain several designs in the 20 to 24 ft range for hulls suitable for steam or electric power.

This 22 ft fantail steam launch was built in our shop in 2001-2002. Power is a 2¾ hp steam engine turning an 18 in. x 30 in. propeller at 350 rpm.

Construction is double planked red cedar on bent oak frames, fully glued.

Lines plan for Design #123, 22 Foot Steam Launch
Scanned image of Plan #123, Sheet 1. Lines plan for 22 Foot Steam Launch

Boring for the stern tube.
The backbone assembly showing setup for boring for stern tube.

The backbone is laminated yellow cedar with an oak worm shoe. The shaft log was assembled with a square pilot hole. The stern tube is glass and epoxy resin laid up over a copper liner and will be bonded in place. Here the boring bar has been set up ready to open up the pilot hole to tube diameter.

Setting up.
Setting up beam shelves and temporary molds.

The hull construction is double planked red cedar on bent oak frames, to be built upside down. Here the building frame has been assembled and the temporary support structure for the beamshelves set up. The beamshelves, which are horizontal and sawn to shape, have been fitted to the curve of the sheer line. The first building mold is being set up.

Rim timber assembled and glued.
The molds and rim timber are now in place.

With the molds all set up, fashion pieces are fitted to the beamshelf in the stern to form the rim timber around the fantail.

Backbone fitted and fastened.
Keel assembly attached to beam shelf and molds.

The backbone has been lowered into place in the mold notches and fastened bow and stern. The rim timber has been dressed to shape and faired into the plank rabbet along the horn timber.

Ribbands and frames.
Steamed frames in place over bilge stringers and temporary ribbands.

Ribbands notched into the molds completes the building jig. Ribbands attach to the rim timber and to the stem with jogged cleats to ensure correct alignment for the frames. The wide stringer is a permanent bilge stringer. In this picture framing has begun amidships.

Framing (July 2001)
Framing nearly complete.

The frames are Garry oak, 1 in. x 5/8 in. on 6 in. centres. Amidships they run in a single length from one side to the other. In way of the stem, shaft log and horn timber they are let into sockets chopped into the backbone. Here frame sockets are being chopped along the horn timber. July 2001.

Framing completed
22 ft steamboat Design #123, framing completed

Framing complete and faired for planking. Note frames boxed into backbone aft. Farther forward they run in a single length from sheer to sheer, with glued wedges at the garboard.

Planking in progress
Two layers of red cedar planking

Planking is two layers of red cedar laid fore and aft with seams staggered, set in epoxy glue. Fastenings are temporary screws through plywood buttons. Inner layer is 1/4" thick; the outer layer 1/2".

Planking complete
Planking complete with pin plugs ready to trim

Before fairing, all holes left by fasteners are filled with pin plugs set in epoxy.

Turning the hull over
Using block and tackle to turn the hull over.

Design #123 hull and deck package ready for delivery to Bellingham WA. Installation of machinery and finish work will be carried out by the owner.
Design #123 hull and deck

Another view of the boat ready for delivery.
Waterline and boot top marked.

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Last modified 2007 06 28