BOTTLE! - Simple (but sophisticated) Footy Class* Model Yacht
Lets quickly make a futuristic radio controlled model yacht from household items and tools!
* A (few) plastic (PET) 1.5 litre fizzy drink bottle with a long sloping neck.
* A valve out of a bike tyre tube
* A ping pong ball (plastic rather than acetate)
* A small, light plastic food pottle - 200-250ml, with a close fitting strong lid about 75mm across - supermarket
* Helicopter blade, 210-325 mm - 275mm ideal, symmetric foil. Plastic ok; wood, fibreglass or carbon better!
* Three stainless steel bicycle spokes - 2mm (14 gauge) for mast, 15SWG for rudder, 16SWG forsail arm.
* 500 mm of 4mm carbon fibre tube (kite shop) - fibre glass tube or 3mm rod or 6mm wood dowel, or Al also OK
* A 300mm x 3mm bamboo skewer
* 3mm thick fluted plastic (Polypropylene) sign board (Sign shop) -100x200mm
* Flexible PVC plastic tubing - 300mm of 3mm ID (inside diameter), 4-6mm for rod mast, Hardware store
* Fishing sinker - teardrop or better, torpedo shaped, 7 - 9 ounces (200-250 grams)
* 2 stainless steel paper clips
* Safety pin, washer or small ring
* A large, coloured, thin plastic (LDPE) shopping bag - minimum length 500mm
* Duct tape - for sail reinforcement
* Scraps of coloured vinyl (Sign shop), or PVC sticky tape
* Scraps of 1mm thin ply or iceblock or coffee stirrer or tongue depressor wood sticks
* Plastic tube lollypop stick - 80 x 3mm - outside any sweet shop
* 300mm thin kevlar thread 10-20kg (Fishing or Kite shop - Dyneema, Spectra)
* A small plastic bead with 2mm or slightly less hole
* A small metal screw eye and a small screw and washer
* Small amount of house paint - Dollar store acrylic craft paint
* Scrap of felt and petroleum jelly
* Scraps of light card for patterns
* Bicycle pump
* Electric fan Heater
* Sharp knife - snap off blade 'boxcutter'
* Drill and drill bits - 8, 2, 3 and 1.5mm
* A pair of pliers with side cutter for bending and cutting wire
* Small soldering iron with sharp tip - maybe flame heated wire in a cork would work slowly!
* Medium grade sandpaper (80-100 grit)
* Contact cement - aromatic, brown, thick glue available from Dollar stores in 30g tubes
* Very small pack of two part epoxy putty - Dollar stores
* Old large screwdriver or chisel and a hammer
* Pair of plastic gloves
* Set square or piece of square card, and a flexible ruler
* Indelible spirit fine tip pen
* Tub and water
* Radio control transmitter and receiver. Any old 2 channel set will do, available second hand cheaply.
* Sail servo. Standard servo for model cars is ok, but heavy (40gms).
* Rudder servo. Small, cheap 9 gram servo. Can use heavier but not necessary.
* Battery. AA cell holder as supplied with most sets is fine. AAA better to save weight.
* Upgrades: 5-10gm FM receiver; 12-16gm 2kg/cm torque sail servo, 1S LiPo10gm battery
* Switch-Jack power plug & switched socket mounted on pot for off/on & battery charge