__
|
| |
|
|
__
|
2005 OSU Team Orange "Diamondback"
Summary
The Diamondback was designed to compete in the 2004/2005 AIAA/Cessna/ONR Design/Build/Fly contest, held in Patuxent River, MD in April of 2004. The aircraft was optimized to perform a combination of a sensor reposition mission, and a re-supply mission. In the sensor reposition mission, payloads had to be carried on the wingtips and deployed in two separate locations on the runway after flying a prescribed course. For the re-supply mission, the payload was carried internally. Flight score largely depended on how fast the missions could be completed, and mission time did not end until the aircraft was disassembled and stored in a box. The Diamondback featured a unique bicycle landing gear arrangement, and payload release system. The Diamondback finished in a very close second place at the contest.
The Airplane The Team Multimedia Contest Results Sponsors
Specifications
Wing
Wingspan: 74.76 in
Wing Area: 716 sq in
Aspect Ratio: 7.81
Airfoil: SD 7062
Fuselage
Length: 48 in
Width: 7 in
Height: 5 in
Propulsion
Motor: Kontronic Fun 600-18 with 3.7:1 gear ratio
Controller: Jazz 55-10-32
Fuel: 14xSanyo 1950
Propeller: 16 in
Weights
Empty Weight (without batteries): 6.4 lb
Battery Weight: 1.2 lb
Payload Weight: 6 lb
Gross Weight: 13.6 lb
Features
Remote independent payload release system
Bicycle with rear wheel steering, and wingtip outrigger gear. This gear configuration allowed the aircraft to taxi to the next payload box after one payload had been released. Ground handling with asymmetric payload was one of the most difficult aspects of the design challenge.
Full span ailerons for effective roll control with external payload.
Performance
Take off at gross weight (GW): 130 ft.
Max climb rate (GW): 8.5 ft/sec
Stall speed (GW): 37 ft/sec
Maximum speed: 91 ft/sec
Payload release system:
The wingtip payload release system was critical to the success of the Diomondback. Each payload weighed 3 lb and was carried on the wingtip. The payload alone was equal in weight to the airplane alone. The resulted in challenges in holding the payload during high-g turns and landing, and reliably releasing the payloads in the appropriate locations on the runway. The Diamondback release system was designed around a hunting bow release mechanism. This made it simple, and reliable, and capable of handling large loads. It also eliminated the need for the pilot to actuate the servo for quick loading of the payload. The payload was held from rotating by a cradle which was sculpted into the top surface of the wing. Release was accomplished via a servo, and gravity would cause the payload to roll off of the wing.
The OSU Orange Team design team was led by a Chief Engineer, and divided into three primary groups: Aerodynamics/Stability and Control, Propulsion, and Structures.
Chief Engineer: Ronya Rolen
Aerodynamics / Stability and Control
James West (Lead)
Shane Hanson
Mutsumi Tanaka
Propulsion
Sarah Summers (Lead)
Amelia Buckner
Michael Forsberg
John Hladik
Structures
Kate Bell (Lead)
Tim Abbott
Nick Baker
Kenny Blackburn
Dwight Boggs
Joon Ling Lai
Hong Yeow Lee
Jian Hao Lo
Neal Singletary
Pilot: Dan Bierly
Spotter: James West
Pit Crew: Tim Abbott, Dwight Boggs, Shane Hanson
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: The diamondback snake
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.
External Payload Flight (37MB)
The Diamondback prototype is seen here performing a successful test flight with external payloads
Orange team flight test crash (28MB)
This flight took place within two weeks of the contest. The radio went into failsafe just before the crash. The payloads which were made from PVC essentially vaporized.
Team Video: The following music video introduces the team, and highlights the development and testing of the aircraft. The video also includes contest footage.
Full size version (550 MB) Small Version (45MB)
Pictures
(Hover cursor over any thumbnail on this page for a description)
Teams and Trophies
Contest
Miscellaneous
The Diamondback aircraft was optimized to fly two of the three available missions for the 2005 DBF contest; sensor deployment, and re-supply. Flight score was the sum of any two missions chosen, and depended largely on how fast a mission could be completed. The sensor deployment mission involved loading the external payload on the aircraft, flying a prescribed course, landing, remotely dropping a payload in a box, taxi to a new box and drop the remaining payload, take off again, and repeat. Re-supply involved alternately flying empty, and with internal payload. Pit crews would load the payloads for each mission, and unload the payloads for the re-supply mission. At the end of each mission, the aircraft had to be quickly disassembled at put in a 4 ft x 2 ft x 1 ft box before mission time ended.
Total score was the written report score, times the flight score, and divided by the aircraft "rated aircraft cost" or RAC 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.
The OSU Black and Orange teams were in a close battle for first and second place all weekend, with the lead changing hands more than once. On their last flight the OSU Black team edged out the Orange team. In the end, the difference between first and second was one of the closest in contest history; only 1.2%.
Challenges
Wingtip remote payload release, and quick loading
Flying with almost 50% of the aircraft weight on the wingtips
Taxiing after releasing one of the payloads
Quick disassembly of the aircraft to fit in the 4' x 2' x 1' box
OSU Team Orange 2005 Score Summary
Report Score: 91.75
Flight Score: 24.59
RAC: 7.59
Total Score: 297.26
Overall Place: 2nd
The following sponsors contributed to the project. The OSU Orange team greatly appreciates their support, and considers them members of our team. Without their support, the project would not have been possible.
2004 OSU Black and Orange Teams
Boeing
Steve Bradley
Charlie and Janette Bell
Ditch Witch
Enviro Systems
Helicomb International
Hurst Aerospace
L. Andrew Maciula
Lockheed Martin
Michael Heusser
NASA Oklahoma Space Grant Consortium
Nordam
Northrop Grumman
Precise Machining