1. MP Prototype 2 1IWF-EXP/ÖAW GRAZ  Smaller Size  Outcome of the test results with MP-P1 was the need for a reduced cross section  Rectangular Shaped Cross Section  One key topic is the storage of the tether  Classical winded coils contain high risk to get stuck during unwinding  Use of flex-board as tether together with slip-ring mechanism provides higher reliability  Water Tightness  Protection of MP electronics and payload against water turned out to be important  Externally Mounted Heater  Concentration of the heat-flow into the ice rather than heating the entire probe Design Aspects

2. MP Prototype 2 2IWF-EXP/ÖAW GRAZ  Size: 40 x 40 x 195 mm  Estimated mass: 450g w/o electronics  Main Components  Cable cartridge Contains the tether and the slip-ring mechanism  Body Contains the MP electronics and provides space for the payload  Tip Contains front heater and provides space for optional vibration system Overview

3. MP Prototype 2 3IWF-EXP/ÖAW GRAZ  Shall provide:  High value for the heat conduction  High weight density to shift the CoG close to the tip  Single curved surface to facilitate mounting of heater elements  Water tight interface to the main body  Space for vibration system The Tip (1/2)

4. MP Prototype 2 4IWF-EXP/ÖAW GRAZ  Present design  Copper as material  Dimension 40 by 40 mm basis  Pyramidal shape  Flat heater foils  Space for temperature sensor at the utmost front  Threads for mounting of vibration system or other payload The Tip (2/2)

5. MP Prototype 2 5IWF-EXP/ÖAW GRAZ  Shall provide:  Small mass  Optimised space for MP electronics and payload  Large openings for easy installation of MP electronics and payload  Water tight interface to the tip and the cable cartridge The Main Body (1/2)

6. MP Prototype 2 6IWF-EXP/ÖAW GRAZ  Present design  Two flanges (stainless steel) to mount with tip and cable cartridge  Hull made from thin metallic sheets, glued onto the flanges  Flanges provide 4x M3 threads to fix tip and cartridge  Cut outs in flanges for gaskets (O-ring for water tightness)  M2 threads for fixation of electronics and payload  Opening for payload approx. 26 x 26 mm or 18 x 34 mm respectively The Main Body (2/2)

7. MP Prototype 2 7IWF-EXP/ÖAW GRAZ  Shall provide:  Small mass  Enough space to contain more than 10m of tether  Slip-ring mechanism with water tight cover  System to measure the vertical position of the probe  Water tight interface to the main body The Cable Cartridge (1/2)

8. MP Prototype 2 8IWF-EXP/ÖAW GRAZ  Present design  Cartridge body manufactured as one piece  Final design has rather complex geometry  Some pieces have tiny dimensions (critical for assembly) The Cable Cartridge (2/4) Space for tether Cutout for gasket Bearing Room for slip-ring Fixation for side cover

9. MP Prototype 2 9IWF-EXP/ÖAW GRAZ  Present design  Hollow axle for fixation of tether  Rotating flange for fixation of slip-ring and bearing  Sleeve bearings type IGLIDUR® provide water tightness  Slip-ring from PCB material with gold plated surface  COTS elements as electrical contacts (rework to be applied) The Cable Cartridge (3/4) Cable not shown Electrical contacts Hollow axle Slip-ring PCB for electrical contacts not shown Bearing Teflon foil for protection of tether Rotating flange

10. MP Prototype 2 10IWF-EXP/ÖAW GRAZ  Detailed view on cross section The Cable Cartridge (4/4) Cable not shown Electrical contacts Hollow axle Slip-ring Side cover removed Bearing Teflon foil for protection of tether Rotating flange PCB for electrical contacts Position sensor Rear cover Gliding element for cable

11. MP Prototype 2 11IWF-EXP/ÖAW GRAZ  Mass budget  Tip: ~230g  Main body: ~75g w/o electronics and payload  Cable cartridge: ~65g w/o cable  Cable: ~80g  Status  Parts for the first model of cable cartridge are currently manufactured  Assembly within the next weeks  Test of slip-ring: 10.000 revolution with maximum current until end of the year Summary