i've manage to find a few drawings if anyone wants to try and build there own rc land yacht. I just dont know what type of sail shape is required and servo's. I'm going to first try a 36g servo and hope it can handle the force.
Costs so far :
Roller Blade wheels : R50
Balsa Wood : R100
Servo's : R200 each
Sail Material : R20
Reciever : R120
The rest of materials i manage to find in the garage.