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2004 OSU Team Orange "OSpray"
Summary
The OSpray was designed to compete in the 2003/2004 AIAA/Cessna/ONR Design/Build/Fly contest, held in Wichita, KS in April of 2004. The aircraft was designed for a simulated aerial fire-fighting mission. The mission objective was to load up to 4L of water as quickly as possible, and then fly a prescribed course while dumping water through an orifice no greater than 0.5 inches in diameter. Flight score depended on the amount of water carried, and how quickly the entire mission could be completed. Aircraft were subject to several design constraints such as runway length, storage size, battery type and size, motor type, etc. The OSpray name combines the OS for Oklahoma State, and the unique spelling of the bird osprey (a raptor found in aquatic regions) to represent the spray generated when the airplane is performing its mission. The OSpray finished in second place at the contest.
The Airplane The Team Multimedia Contest Results Sponsors
Specifications
Wing
Wingspan: 6.45 ft
Wing Area: 5.2 sq ft
Aspect Ratio: 8
Airfoil: SD7062 flapped
Fuselage
Length: 4 ft
Width: 0.422 ft
Height: 0.58 ft
Propulsion
Motor: Graupner 3300-6 with MEC gearbox 1.82:1
Controller: Astro 204D
Fuel: 16 Sanyo CP-1300SCR NiCd
Propeller: 18x12
Features
Retractable boom
Composite landing gear
Molded wing and tail construction
Conformal water tank designed for fast loading and draining
Performance
Take off distance at full gross: 120 ft.
One of the key features of the design of the OSpray is the retractable boom, water delivery system. The contest score depended largely upon how fast the mission could be completed, but the rules dictated that water dumping could only be done on the downwind leg. The rules also dictated that the water tanks could not be pressurized to accelerate the draining of water. Using the dynamic pressure from the ram air was calculated to be only marginally effective. In order to decrease the water drain time, the OSpray took advantage of gravity head. Drain time for the tank alone through a 0.5 in diameter orifice was approximately 30 seconds. With the addition of the boom, head pressure increased at the orifice such that the drain time dropped to under 15 seconds. This eliminated the need for the OSpray to slow down to dump the water.
The OSU Orange design team was led by a Chief Engineer, and divided into three primary groups: Aerodynamics/Stability and Control, Propulsion, and Structures
Chief Engineer: Matt Stutzman
Aerodynamics / Stability and Control
Jamie Zink (Lead)
Daniel Holland
Mak Sin Nee
Propulsion
Stephanie Shaw (Lead)
Ralph Iasiello
Greg Seefeldt
Structures
Jason Slaton (Lead)
Ali Akbar
Gitogo Churu
David Eudey
Robert Fischer
Nate Harris
Thomas Hays
Tiffany Ice
Jerod Matlock
Myrriah Rowden
Jon Weeks
Pilot: Dan Bierly
Flight test pilot: Ronnie Lawhon
Spotter: Ronnie Lawhon
Faculty Advisor: Dr. Andrew S. Arena, Jr.
Assistant: Joe Conner
*(The above team roster does not include all people involved in the project)
Team Logo:
Team Mascot: Osprey
Memorable quotes:
"ORANGE!" - Dan Bierly after flying a successful mission at the contest
"POWER!!!" -Spontaneous response from what sounded like hundreds of OSU supporters in the crowd
Video
It is recommended that you right click on the link and use "Save Target as..." to download the video to your computer before playing.
Team Video: The following music video introduces the team, and highlights the development and testing of the aircraft. This particular video has a significant amount of video taken from the air.
Full size version 790MB Small Version 64MB
Pictures
(Hover cursor over any thumbnail on this page for a description)
Teams and Trophies
"Eye Candy"
Construction
Flight Test
Contest
Miscellaneous
2004 Orange Team Final Presentation
The 2004 DBF profile involved two different missions. The mission that had the highest difficulty factor, and was worth the most points, was the fire-fighting mission. In that mission, the aircraft had to be loaded with water, take-off, fly a specific course dumping water in a prescribed area, land, and repeat. The "Fire Fight" score was calculated as: 2 * Lbs_Water / Mission_Time. Since mission time was so critical, the OSU Orange team focused on methods for loading, and dumping water as quickly as possible. As described above, both the loading method, and dumping method relied on the use of gravity head. On the aircraft, that required a retractable boom of almost 2 ft. The boom connected to the center of the tank through a valve, and extended deep into the tail when retracted with a high-torque servo. The ferry mission was a mission where no payload was carried, and the plane had to simply fly 4 laps. It was worth very few points.
Overall score was calculated by multiplying flight score by written report score, and then dividing by RAC.
RAC was a "Rated Aircraft Cost" which penalized many aspects of the design. It included penalties for design parameters such as; aircraft empty weight, engine power, wing area, etc. A link to the complete rules may be found below.
Challenges
Avoiding "slosh" as the tank was draining, and changing the vehicle cg.
Loading and dumping water as quickly as possible
120ft. runway limit
Brushed electric motor and NiCd battery requirement
Aircraft had to fit stowed in a 4ft x 2ft x 1ft box
Wichita crosswinds
OSU Team Orange Score Summary
Report Score: 80.53
Flight Score: 11.95
RAC: 6.71
Total Score: 143.49
Overall Place: 2nd
The following sponsors contributed to the project. The OSU Orange OSpray team greatly appreciates their support, and considers them members of our team. Without their support, the project would not have been possible.
Brian Davis
Hideaway Pizza
Ken and Brenda Coulter
Ken and Jane Matlock
L. Andrew Maciula
Michael Heusser
Monroe and Naomi Yoder
NASA Oklahoma Space Grant Consortium
OSU Student Government Association
Robert Austin