A friend gave me a thin(1 mm) plywood sheet measuring about 60x40 cm. I didn't know what to build with it, until I finally chose a model, Emma by Gary Webb (Bearospace Industries). Is it a semi-scale portrayal of a sprit-rigged cruising sloop from the mid 20th century, designed for RC sailing, reduced to 60% so that the individual parts fit on the plywood.
The total length of the model is ultimately 58.5 cm (23").
Due to this, I had to improvise a lot, instead of a lever servo I used a sail winch, but even so there is unexpectedly little space under the deck. I had to come up with a different arrangement for the sail sheets and adjust the location of the rudder servo.
By reducing the length to approximately 60%, the sail area has decreased to 36% and the displacement to 22% compared to the original model.
This is because when increasing or decreasing the length changes linearly, the area changes quadratically and the weight (displacement) changes cubically.
I used 1mm and 3mm plywood (for the ribs) for the model. I glued everything with polyurethane glue, and the finished model was impregnated with diluted epoxy.
For the mast and spars I used carbon fiber tubes with a diameter of 6mm, 4mm and 3mm, the spar is made of bamboo.
The sails are made of Ripstop nylon.
The fin keel is made of 2mm aluminum, with a lead bomb it weighs 980 grams.
The hull of the model with full equipment and sails (without keel) weighs 1060 grams.
Surface treatment - nitro spray, deck and superstructures Revell colors. After much deliberation, I named the model MIAOW
More photos at: tomarack rajce net

Dear friends
I have to declare here...
If I had known in advance what problems I would have to solve, I would have probably built Emma in the recommended size (1 meter) as Gary Webb recommends.
On the other hand..the model fits in a bag even with a stand and fin keel + transmitter in a backpack..
To my surprise, it sails quite well even in very light winds, and I am happy with it.