Rohak edited this page Feb 4, 2017 · 8 revisions


Cesar HARADA, contact@cesarharada.com
Guillaume DUPONT, guillaume@scoutbots.com
Kwanyuk Agnes CHAN, Agnes@scoutbots.com



  • Dimensions

    • Total length : 74 cm
    • Total Hull height : 51 cm
    • Total mast height : 86.5 cm
    • Area of main sail : 1356.25 cm2
    • Area of jib : 858 cm2
  • Weight

    • Total weight 7.25 Kg
    • Sail (including mast and boom) : 231.5 Gr
    • Control box : 696 Gr
    • Hull + Ballast : 6.5 Kg (approx)
    • Hull (without ballast) : 3.5 Kg
    • Ballast (lead) 2.954.7 Kg
  • Electronics

    • Remote controller : FS Sky. FS-GT3C
    • Receiver : FS Sky, FS-GR3E (3 channels)
    • Servomotors : ?
    • Power in boat : 4 AA battery (1.5V each, standard)

Technical Drawing


2 3 4



Test report

  • Wind condition : 8 knots gusts, mostly no wind
  • Current condition : .5 to 1 knots
  • Wave height : max 20 cm, high frequency, disorganised 3d waves



  • Not very successful. Irregular low wind conditions. Test got disturbed by ferries.
  • The boat is hard to maneuver and recover, pull off the water / carry around
  • The currents were often faster than how much the boat could sail, we had little control
  • The boat is tough, we launched in the water by throwing it 3 meters above water, without damage.
  • The electronics remained perfectly dried
  • We forgot the batteries (4AA 1.5V) and we could buy a set of batteries at the corner shop - that’s a very convenient battery pack.
  • The boat was a little too big to take around in public transportation (Hong Kong MTR)


  • The hull does not curve enough (max 25 degrees)
  • There is too much water turbulences between the sections
  • Too much buoyancy
  • The hull is not hydrodynamic enough
  • The boat bows down into the water


  • Not hydrodynamic, needs better penetration in water
  • Motor (Hull & Sail)
  • The amplitude of both hull and sails are too small.


  • Sail is too small for low wind condition

Next Step

Actions for next prototype

  • We need to add a piece of audio tape on the top of the mast to know the wind direction and speed
  • Boat is needs to be lighter, reduce weight
  • Design a ballast that penetrates water better
  • Make a hull that curves more
  • Avoid space between the section to minimize turbulences
  • Reduce buoyancy
  • Augment amplitude of hull curving and sail sheeting
  • Sharper bow, sharper stern (hull)
  • Balance buoyancy front and back
  • Add handles to recover and carry around

See Protei-10.5.7

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