Solar Cyber Yacht

Semi-SWATH design with linear extruded hulls. Batteries, water tanks and other utilities are in the hull, the cabin is on the main platform.

2 photovoltaic wings can be rotated for optimal wind and sun utilization.

Design and construction method

The hull, cabin floor, walls and roof are built with fiberglass coated XPS foam.

-> The structure of the hulls and cabin is easy to set up with 50mm XPS foam boards, then covered with fiberglass and epoxy.

The XPS boards are machined with a 5 axis CNC machine, then glued together.

Single hull, assembled from machined XPS boards, then laminated with fiberglass coatings.

Dimensions
Full length of yacht	14.86	m
Width of yacht	7.5	m
Height of hull	2.73	m

Propulsion
Electric motor	20	kW

Battery pack
Capacity	200	kWh
Weight	1250	kg
Cell type	LFP

PV Power
Peak power	5700	W
Per day@5 hours	29	kWh

Utilities
Freshwater tank	1000	L
AC split unit	650	W
Fresh water generated by AC unit is filtered and used

Calculate draft from given weight:
Weight of yacht, rough calculation:	10969	kg =	10.9	t
Hull footprint area	12.93	m²
W = V x rho x g = Adraft rho * g
Draft = W/(Arhog)	0.41	m

Rough cost estimate
Cost of Epoxy in Thailand		1 € in THB:	37.42
1000 Liter of Epoxy:	170000	THB =	4543	€

Density Liquid Resin	1175	kg/m³
Density Mixed & Cured Epoxy Solid	1150	kg/m³
Shrinkage	97.87%
Cost factor epoxy due to shrinkage	1.021733
Volume Epoxy for Max weight of yacht:	9.538	m³
Cost for full weight of yacht in epoxy:	45000	€
Battery pack	50000	€
PV cells	2000	€
Marine motor 20kW, electronics	20000	€
Interiour, kitchen etc	20000	€
Aluminium profiles for frame of cabin	10000	€
Renting of place to build	5000	€
Sum	152000	€ (DIY)

Project website: www.tiyala.com

Concept by Fabian Gerold, fabian.gerold@gmail.com February 2026