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Science Instrumentation Evaluation Remote Research Aircraft (SIERRA)

Wing Span Length Height Wing Area Empty Weight Gross Weight Max Speed Cruise Speed Stall Speed (clean) Aspect ratio Rate of Climb CG Position Payload weight Payload power Duration. 20 ft. 11.8 ft. 4.6 ft. 42.4 sq. ft. 215 lbs. 375 lbs. 79 kts. 55 kts. 30 kts. 9.43

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Science Instrumentation Evaluation Remote Research Aircraft (SIERRA)

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  1. Wing Span Length Height Wing Area Empty Weight Gross Weight Max Speed Cruise Speed Stall Speed (clean) Aspect ratio Rate of Climb CG Position Payload weight Payload power Duration 20 ft. 11.8 ft. 4.6 ft. 42.4 sq. ft. 215 lbs. 375 lbs. 79 kts. 55 kts. 30 kts. 9.43 545 ft./min. 29-32% Chord ~100lbs 28V DC 8-10 hurs NASA SIERRA UAV • Science Instrumentation Evaluation Remote Research Aircraft (SIERRA) • SIERRA complements other UAVs in the NASA science fleet by specializing in dangerous, low altitude missions that require larger payload capacity than Aerosonde class • Airframe designed by NRL; systems development at NASA ARC • First Flight October 2008 • Payloads flown include: • VIS/NIR Hyperspectral Imager (NASA Ames) • LIDAR Profilometer (CU-Boulder) • Ocean Color suite (NASA GSFC) • MMS (NASA Ames) • CO2/CH4/H20 (Los Gatos Research/Picarro) • C-Band SAR (Artemis/BYU) • UHF/L-band SAR (Mirage Systems) Phil Schulyer, SIERRA crew chief with the aircraft carrying a GP-SAR

  2. Payload Description: MMS Meteorological Measurement System (MMS) P.I.: Paul Bui Primary Data: Navigational Data and Aircraft Attitude - GPS UTC Time 1 Hz - Position 3.9 m 1 Hz - Velocity 0.1 m/s 100 Hz - Attitude (pitch and roll) 1.0 mrad 100 Hz - Heading 1.5 mrad 100 Hz 2

  3. Picarro G2301-F PI: Dr. Laura Iraci, NASA Ames Research Center • 10Hz eddy-covariance flux analyzer modified for aircraft • Previously flown in C-130 and Twin Otters by Purdue (Shepson et al) and NOAA ESRL (Sweeney et al.) • Uses cavity ring-down spectroscopy to measure CO2/CH4/H2O • <6ppm + 0.3% H2O precision at 10Hz data rate

  4. SIERRA RRV Payload SIERRA payload nose (Rear) MMS INU MMS Data system Picarro G2301-f Picarro Inlet tube Pump in fusilage 5-hole pressure probe nose cap

  5. Sample data from testflight at Crow’s Landing H2O Column CO2 Column

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