ISR 2011 : SCUBSTER Submersible General Presentation

Contents The Team Overview & Goals Design Philosophy Design & Fabrication Testing & Training Prototype Budget Our Partners & Sponsors Questions

The Team Project Leader : Stephane Rousson Technical Team : Minh-Lôc Truong (Design) Bruno Sertier (Engineering) Divers : Terence Dewaele (diving instructor) Delphine Del Cont Robert Bonnar Stephane Rousson Team Coordination : Delphine Metayer http://www.scubster.org/Team_Rousson.html

Overview & Goals The original project started in 2009 when Stephane Rousson with the support of his partners decided to release a new Submersible Concept with the Innovative Design support of Minh-Lôc Truong. The first aim of the project was to introduce a new wet submarine concept, with a design inspired by the Swordfish, focusing on manoeuvrability, undersea wide vision and high capacity for an extended autonomy. With the help of his partners and collaborators, the original Demonstrator prototype was first tested in Nice area during summer 2010 and has never stopped being optimized since . For its very first participation to the International Submarine Race, the team is pleased to introduce the Scubster Demonstrator.

Design Philosophy The Scubster demonstrator was designed to validate a new hydrodynamics approach combining aestheticism, inspired by sea animal universe, and manoeuvrability. An original drivability & propulsion layout concept, based on a twin contra-rotating lateral propellers idea, enables a complete 6 degrees of freedom management only based on a 360°independent propellers orientation + left/right propeller coupling manual control.

Design & Fabrication Model Testing Hull Bill of Materials Safety Control Manoeuvrability Propellers Study Main dimensions Main Characteristics and calculated Speed

Model Testing In June 2010, the ISTV Engineering School (Toulon – France) released a Test Report of drag measurement in the school model Test Basin with a model supplied by the Scubster team prior to Demonstrator manufacturing. The aim of this test was to predict the Drag Coefficient (Cx) and establish the hydrodynamic performance of the Demonstrator. A specific equipment (a pod equipped with a force gauge and driven at a pre-set speed range by an electric motor) was used for a 1:5 scale Test Model prototyped in stereolithography by E2R Company based on 3D CAD drawings performed by the Scubster technical team.

Hull (1/2) Carbon fiber + Epoxy resin pre-assembled hull Hull half mold core preparation with carbon fiber sheets Half hull structure (pieces of wood with mirror possibility) for matrix mold core manufacturing Final assembly with gel coating prior to final sanding and painting

Hull (2/2) Canopy kinematics Principle for easy opening and pilot access The empennage can be dismantled for compact packaging during transportation overseas and also gives apossibility to use an other set of stabilization surfaces

Bill of Materials Hull : Carbon Fiber Epoxy Resin coated Canopy : Plexiglass Resin Transmission : Aluminium, Stainless Steel, Bronze, Glass Fiber filled Nylon 66, Carbon Fiber Tubes, Rubber Propellers : Epoxy coated Wood / Laser sintered Nylon with glass beads Empennage : Aluminium Seat : Carbon fiber Epoxy Resin coated Safety Buoy : Nylon, Aluminium, Stainless Steel, HDPE

Safety (1/4) Emergency Exit : The wide canopy with easy access and opening allows a fast and easy ability to evacuate the submarine (actuated either from inside by pushing the canopy with hands or from outside by pulling the ring at the rear of it) Strobe : Leakproof (40 m) flashing LED at 1 Hz, located on the top of the submarine

Safety (2/4) Safety Buoy : System overview

Safety (3/4) Safety Buoy : The submarine is equipped with a handle + cable + friction stirrup mechanism (adapted bike braking system) pinching a spool extension. The spool is easy to be properly rewind with a modified fishing gun reel (after slipping the spool flange down and rotating it for manifold clearance and access). When the handle is pinched, the stirrup does prevent the wire spool from unwinding. If the handle is released, the stirrup does open and liberates the spool for buoy natural pop up.

Control COMPLETE PROPELLERS COUPLING

Control RIGHT PROPELLER DECOUPLING (RIGHT TURN)

Control LEFT PROPELLER DECOUPLING (LEFT TURN)

Manoeuvrability

Propellers Study (1/2) Based on expected performance and achievable submarine speed for a given RPM and supplied Power, a first CFD Study of a 3 blades propeller was performed in April 2010 by ENSTA Bretagne (Engineering School Specialized in Marine applications; Brest – France)

Propellers Study (2/2) After speed measurement in swiming pool and medical experts advices, the team designed a new propeller for optimized thrust at a lower pedalling RPM with a specific Propeller Calculation Software (Heliciel) : - External Diam : 490 mm - Blade profile : NACA 1412 - Blade Curvature : 20° - Efficiency : 0,79 @ 168 RPM & 1,25 m/s Based on 3D CAD drawings we provided, E2R manufactured for us a set of two contrarotative propellers in fast prototyping with the Nylon laser sintered technology

Main Dimensions

Main Characteristics and Calculated Speed Sref x Cx : 0.224 m² (from test results on Demonstrator with measurement of drag force vs speed in a Swiming Pool) Hull Volume : 1.45 m3 Calculated Max Speed : 1.25 m/s (2.43 knots) @ 300 W developped power

Trials & Testing (1/2) Summer 2010 : First prototype trials undersea (Saint Jean - Cap Ferrat, Nice area) February / March 2011 : 2 campaigns of testing in an Olympic size Swiming pool (Piscine Jean Bouin – Nice) Drag coefficient (Cx) determination by measurement of Drag Force vs. Speed Traction measurement with 2 types of propellers (submarine moored) Speed Up and Max Speed measurement Drivability trials with left/right propeller coupling/decoupling & orientation April 22, 2011 : New trials in sea with last design optimization (Saint Jean - Cap Ferrat) Reduced size of stabilization surfaces Reduced tail volume (improved stability with better buoyancy center and reduced inertia) Hull surface finish improvement

Trials & Testing (2/2) April 26, 2011 : Biometric Evaluation with Diving Medical Experts ( SMMUM Marseille) Pulse record with variable dive depth during pedalling

(material and tooling only) Prototype Budget (material and tooling only) Hull : - Carbon Fiber : 640 - Epoxy Resin : 3000 - Empennage : 100 - Gel coating & painting : 300 Canopy : - Moulded Resin : 1600 Propulsion : - Propellers : 1000 - Transmission : 1000 Safety devices : - Safety Buoy & mechanical actuation system : 150 - Strobe : 40 Small equipement : 1000 Specific tools acquired for assembly : 500 Sub Total : € 9530 Package for transportation by airplane : 500 Grand TOTAL : € 9830

Our Partners and Sponsors Ministère des Sports (French Sport Ministry) Aqualung E2R Sicomin Mapyachting Gates Nice Diving Lemer Partners : E-Props, Heliciel, Dynasub, Plexinautic Air france Cargo, Janine Robin, SMMUM Universities & Engineering Schools : Supmeca (Toulon - France) ISITV (Toulon - France) ENSTA Bretagne (Brest - France) The Scubster Team does also support sharks protection via Ecosy-Action (above painting from Belinda Bussotti, Artist in Monaco)

Questions