Flying-Boat V0.2
Description
A Small Experiment With Foils To Evaluate The Feasibility Of A Flying Boat With U Shaped Hydrofoils. This Is A Pure Fablab Creation We Started To Have The Idea To Test This With Ricardo At 20H00 One Evening @ The Artilect Fablab In Toulouse And At Midnight All The Part Where Designed & Cut Ready For Assembly. The End Idea Could Be To Modify A Hobbiecat Or Similar Boat. But For Now It Is To Have Fun With The Understanding Of Hydrofoils. Concept To Demonstrate: - U Shaped Foil Which Have To Following Interesting Advantages: - Reduced Induced Drag Due To The Presence Of Sidewalls - No Stress Concentration A The Root Of The Wing Requiring Costly Carbon Fibers - Connected To The Bot By A Pivot Axis Allowing Easy Angle Of Attack Control And To Put The Foil Out Of Water For Ditching. Things Not Included In This Design: - A Decent Hull - Lateral Control & Stability - Pitch & Altitude Control & Stability - Hydrofoil Polar Calculation Hydrofoil Design: - Chord Widith 74Mm - Speed 5Kph -> 1.4M/S - Water Kinematic Viscosity @ 10Degc = 1.267E-6M^2/S - Reynolds (In Water) Re = 8.0X10^4 - Lifting Surface 0.03M^2 - Initial Idea Was To Use An Eppler 818 Profile It Is Good At Those Low Reynolds Numbers. More Details Can Be Found There Http://Airfoiltools.Com/Airfoil/Details?Airfoil=E818-Il - However Making Such A Small Profile With Styrofoam Was An Issue. - Since At Those Very Low Reynolds A Flat Plate Works Well. A 1 Mm Plastic Plate Was Used With Some Camber. First Test: - Very Crude Just Pulled By A Truing At The End Of A Stick On The Local River - She Managed To Take Off At Fast Walking Pace Even Loaded Up To 3.5Kg - The Hull Shape Is Extremely Crude & The Bow Create An Incidence Effect To The Front Foil Requiring A Bit More Incidence To Take Off. What Is Next: - Upgrade The Prototype To Have A Better Hull Shape - Integrate Lateral And Vertical Control - Integrate A Propulsion System Making Similar Effort As Sails. - Generate A Polar For The Foils. Pictures Courtesy Of Ricardo. Made In Fablab Artilect: Https://Artilect.Fr/
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