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The MkIII aims to improve the power to cost ratio of the Turbine by increasing the power output (targeting 50watt or x10) with a large reduction in the number of purchased parts. The aim is to also design the parts and print settings to produce the whole turbine within a single 90meter reel of plastic. Here is a list of the improvements made so far...
MkIII Improvements Incorporated
Passive Variable Pitch Mechanism
Piston & Piston Cover - Bore interface reduced to increase radial location and reduce un wanted movement in the pitching mechanism.
Piston & Piston Cover - Piston length increased and Piston cover made a through hole to increase radial location at extremes of pitching.
Piston Cover - Taper location feature with Shaft ID to locate the component and prevent out of parallel with the Pitch mechanism.
Crank - PCD of Crank increased x 1mm to reduce chance of cranking across the bolt hole.
Crank - OD to bearing increased 0.1mm to reduce gap and reduce un wanted movement in the pitching mechanism.
Crank - ID to bolt increased 0.1mm to increase gap and reduce the chance of cranking from high cycle fatigue.
Crank Arm - Increased length to reduce the chance of pitch reversal at maximum extension.
Structure Assy new part - Cable guard to protect cables from rotating shaft between the location bearings.
Designed for Mk1 Generator (removed Stepper)
Increase main location bearing seperation for increased roll stiffness.
Better bearing concentricity (both support on a single structure).
Removed the rear bearing structure and x2 bolts for fewer part count and better bearing alignmnet.
Reduced bearing end load for reduced resistence to rotation and increase bearing life.
Repositioned Stepper for reduced structure interference with rotor (top surface drag).
Shapped the tower transmistion for reduced structure interference with rotor (Bottom surface drag).
relocated tail rod nut inside structure to protect from the weather.
Removed x2 nacelle fixing screws.
Redesigned cable guard for new bearing positions with a thinner wall section for reduce material useage