FRENCH NAVAL ACADEMY - LESTRHEOL

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In English LESTHREOL means:   LESTR : means Vessel and HEOL : Sun - hence 'Sun Vessel'

The LESTRHEOL project was initiated as a collaborative study between two schools : l'Ecole Navale et le lycée La croix rouge . The objective of this project was the design of a small innovative boat to be driven by solar energy. Students of the two schools completed studies with the same specifications

 

 

This project was realised with an industrial partner : It's a young company named "STELPA design et prototypage" de Port-la-forêt (56) FRANCE. The initial project was undertaken from November 1999 to july 2000.

 

The manufacturing cost was minimized with help from civilian and military partnersSome technological choices have been made to obtain an innovative and original product.  Some  photographies can be seen.

 

The "Grand prix de l'Ecole navale" is is a sailing regata organized by the french naval academy, featuring the Lestrheol.

 

 

 Specifications

General

  • Solar-powered boat
  • 2-seater
  • Velocity: 6 knots
  • Displacement: 160 kg
  • Size: length: 6.47 m: width: 1.67 m: draught: 0.75 m
  • Electric battery autonomy: 3 hours
  • Propulsion: marine propeller
  • Propeller rotation rate: 500 rpm
  • Ecological and innovative nautical solar powered boat
  • Minimum weight of the hull
  • Hull shape: wave-breaking bow
  • Airex-Carbon composite for the hull shape 
Energy
  • 10 solar panels (Webasto): 500 W - 24 DC V
  • weather- sealed for use in marine environment - (21 kg)
  • 2 Electric batteries: 12 DC V - 60 Ah (36 kg)    - Autonomy: 3 hours
  • DC motor power : 650 W - 24 DC V
  • Voltage regulator + variable speed controller 
Propulsive system
  • Propulsion by tractive pod and electric motoreducer
  • Propeller : Modified Wageningen blades, 4 blades, 400 mm diameter
  • Sheer stress: 160 N (estimated) at 6 knots

hélice       

Manoeuvrability
  • With orientable rudder only
  • With orientable pod only
  • With both orientable pod and rudder 
   Etudes des élèves de l'Ecole navale concernant LESTRHEOL
  • Design of the propulsive system
  • Design of the manoeuvrability system
  • Study about the sheer stress 
  • Design of the adapted propeller
  • Design of a special tow to take the boat on
  • Study of new motors for this boat
  • Comparison of manoeuvrability with orientable pod or not.

   Important design choices
  • Solar pannels stick on the roof 
  • Motor in a orientable pod
  • Manoeuvrability with orientable pod and rudder 
  • Tractive propeller in front of the pod 
  • Wave-breaking bow
  • Airex-carbone shape material

 You can have a look to :
  Presentation at the SIMOUEST  workshop session poster

  PDF presentation (1,7 Mo - It needs a few minutes to download)

 Back to french version


   Partners 

  • STELPA Design & Prototypage (Paolo RISTA - Port-la-forêt 56):  Manufacture of the shape 
  • Designe and Manufacture team (SEF) of the IRENav  (Research institute of the Ecole Navale) :  Manufacture of mecanical system and pod.
  • Atelier électrotechnique (SEF) de  l'IRENav (Institut de Recherche Ecole Navale) :  Câblage électrique 
  • Ecole Polytechnique fédérale de Lausanne (CH) : Usinage hélice  
  • Private school  La croix rouge de Brest (29) FRANCE : Study of the motor and the control system

   Solar boat links

Sites sur les bateaux solaires en suisse - compétition et contructeurs

View of the annimation    View of a presentation of the project 

CONTACT at the Ecole navale:

Contact : JP Martineau
Ecole Navale - ENGEP 
IRENav (Photo
BP 600 Lanvéoc-Poulmic 
29240 BREST NAVAL
FRANCE

Tél : 02 98 23 40 20      Phone :  (33) 298 234 020
Fax : 02 98 23 38 57     TCP : (33) 298 233 857
martineau@ecole-navale.fr

 

CONTACT:  nelson@solarnavigator.net  07905 147709 (UK)

 

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