Data Logging and Telemetry
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Data Logging and Telemetry

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Data Logging and Telemetry Data Logging and Telemetry Presentation Transcript

  • Data logging and telemetry: tools for performance optimization Francesco Meschia
  • I fly gliders •  Since 2000 •  Slope soaring since 2003 •  FAI F3J since 2006 •  Team manager for the F3J Italian team in 2007, 2008, 2011 •  Team pilot for the F3J Italian team in 2009 •  FAI F5J since 2011
  • I fly F3J
  • F3J launch •  Man-on-man competition (6-15 pilots) •  No winches! •  Two-men tow with monofilament line (500 ft) •  Incredible amount of energy!
  • F3J launch tenets •  You don’t launch high, you lose •  You don’t launch fast, you lose •  You don’t launch strong, you lose your friends –  towmen, that is
  • F3J Launch Optimization: why? •  “We’ve been watching the German guys closely, our planes don’t launch nearly as strong as theirs do – we need to understand why, quick!” (G.Gallizia, 2008, after the F3J Eurotour France contest)
  • F3J Launch Optimization: what? •  Three simple things we can play with –  launch camber –  elevator preset –  towhook position •  Can’t be that hard, huh? –  well, it turns out it is…
  • F3J launch optimization: how? •  Need to set a goal •  Need to measure the outcome •  Need to analyze how the parameters influence the outcome •  Need to find a path to improve
  • Measure to know •  Optimization goal is to extract maximum energy in the shortest time –  time is easy to measure –  how to measure energy? •  Energy at the end of the launch comes in two forms: –  gravitational potential energy (i.e. “how high”) –  kinetic energy (i.e. “how fast”)
  • Tools of the trade: data recorder From  top  le*,  clockwise:  www.eagletreesystems.com,  www.sm-­‐modellbau.de,     www.rc-­‐electronics.org    
  • Launch Log Al<tude   Airspeed  
  • Data recorder: how to install?
  • Data recorder: a better installation
  • Data recorder: the pod
  • Data reduction and analysis •  Just altitude and airspeed – ok for end state only •  Need something more if we want to understand what’s going on •  How does energy “flow” from towing system to plane? –  towmen pull line, line pulls plane –  wait! the line!
  • The importance of the towline •  Energy goes into line and from line into model •  Line stretches with tension –  it is essentially a spring –  it is the main “mode” of energy transfer •  We need a way to measure line tension!
  • Line tension transducer •  Suitable load cell manufactured by a French modeler (www.xerivision.com) •  Attaches to the towline, hooks onto the towhook –  cable brings analog signal to data logger, disconnects upon release
  • More data to analyze Al<tude   Trac<on   Airspeed  
  • A picture starts to form…
  • …with more and more detail…
  • …and even more detail…
  • …discovering something new… “ringing”   2nd  “hump”   1st  “hump”  
  • …to answer old questions almost  no   “ringing”   Only  one   “hump”   Towhook  moved  5  mm  a*  
  • Other optimization: the zoom airspeed   50  m/s   al<tude  gain   55  m…  yield   is  43%  only!    
  • Optimizing zoom with snap flap same   airspeed,   50  m/s   Al<tude   gain  now   90  m!   yield  70%  
  • Wait! all this is not telemetry •  True, but… –  data collection comes first •  Real-time telemetry is a useful addition –  potentially, another game changer –  not allowed by FAI rules, except for safety •  Good for training –  the pilot should not be looking at a display –  audio or buddy relay is to be preferred •  Great for team training!
  • UniLog and telemetry •  Available for Graupner, Multiplex, Jeti •  Of course I fly Futaba •  Needed to invent something myself –  well, almost: the actual inventor is W. Korosec •  2.4 GHz, Bluetooth protocol radio link from UniLog to UniDisplay
  • DIY telemetry system
  • Telemetry as a team project •  3 complete units were built •  Used in team training sessions •  Data are received directly into PC •  Real-time or deferred analysis possible –  real time: finding best “float” –  deferred: launch setup
  • Finding minimum sink setup too   steep…   trim   up…   beOer   trim   maybe   down…   too   perfect!   slow…  
  • Further possibilities •  Angular position sensors available –  allow AoA and sideslip measurement •  Direct servo/receiver current draw measurement •  In electric sailplanes/models –  current, voltage, input power –  RPM, output power, efficiency –  climb performance (m/(s*W)), (m/mAh) •  Live onboard video feed?
  • Radio gear current draw Al<tude   Current   draw   Pull-­‐up  
  • Electric motor logging Voltage   Current   Efficiency   Al<tude   RPM  
  • Wrapping up •  Real-time, deferred analysis, all is good •  Measuring and collecting data over time is key –  a way to compare, understand, improve –  sharing within a team is equally important –  real improvement is possible •  New radios are arriving with telemetry –  integrated display of telemetry data –  sound and speech synthesis (readout, vario, alarms)
  • Thank you / Q&A