Raven
BizJet/Medevac
Dynamically Scaled
Demonstrator
Linköping University
Aircraft Design Student Project
2007
Introduction
 Course given in fourth year of Aeronautical Engineering
 Duration of 5 month (January-June)
 13+4 students and 4 different nationalities
 Two different courses collaborates together
 Aircraft Design
 Ergonomy Design
Goals
 Design a BizJet/Medevac aircraft in full scale
 Design and manufacture a dynamically scaled aircraft based on the full
scale study
 Design the interior solution for both bizJet and medevac application
 Why?
 Simulate the “real” aircraft behavior with reduced risk
 Extend the flight envelope
 Understand difficulties with dynamic scaling
 Educate aircraft designer
 Allow future engineers to complete a full project prior to starting their
professional careers
Requirements Full Scale
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Two roles: bizjet or medevac
Quick change (30 min max.)
Two pilots
In medevac role:
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575 kg payload (max 700kg)
Range 1300 nm
Two Patients, one doctor and one nurse
Enable one stretcher to remain inside while the other is removed
 BizJet Role
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4 to 6 passenger
Offer space and high class interior
 Able to use runways 800m long (ISA+20)
 Sized around two Williams FJ33 engines
Requirements for Demonstrator
 Dynamic scaling
 Full instrumentation for flight testing
 Endurance minimum 15min
 “Car top testing compatible”
Work Load
 400 h/person
 16 Weeks
 25 h/week
 Total of 5200 work hours for a labor cost of
 Project equivalent to 3 man years
Resulting Aircraft - RAVEN
Main Characteristics
 Cruise speed M 0.6
 Range 1300 NM
 Take off and landing distance 800m
 2 Williams F33 engine
 4 to 6 passenger
 2 doctors + stretchers with patients
 Empty weight 3895
General Structure
Fuselage specifications
Length = 12 m
Diameter = 1,7 m
Back door
solution
Weather radar
location
Main Door and Canopy
Canopy design:
Main door:
• Width = 0,7 m
• Height = 1,4 m
• Follows the minimum visibility pattern
• Has to be good looking
Spars and Wing Attachment
Rear spar
Front spar
”Kick spar”
Landing Gear
Back Door Solution
Engine attachment
Back door
2,05 m
Bulkhead door
• Width= 0,68 m
• Height= 1 m
Back Door Opening
1
2
Stretcher loading
Sliding track
Rotating track
3
4
Result –Interior
 Storage
Result – BizJet
Result – Business Jet
 Chairs
Result – Business Jet
 Table
Result - Medevac
 Stretchers
Allfa Europe
Result - Medevac
 Stretchers
Result - Medevac
 Chairs
Result - Medevac
 Medical equipment
Dynamically Scaled Model
Main Characteristics
 Froude-scaling theory (accounts for gravitational-, and inertial
effects)
 14 % scaled model
 Wing span 2 m
 Take off weight 12kg
 Endurance 15 min
 Engines: 2 Funsonic FS-70 Typhoon (70N thrust)
 Ability to carry 1.2 kg of flight test equipment
 Redundant receiver
 Telemetry with basic flight parameters and audible
stall warning
Flight Test Equipment
 Based on a PC 104 and I/O board
 All control surface are logged (Pod and signal to servo)
 IMU
 3 axis acceleromaters
 3 axis gyro
 GPS postition
 Alpha & Beta vanes
 Static and Dynamic Pressure
 Engine
 RPM
 Temparature
 SFC
Realization
Mold Preparation
Wing Manufacturing
Conclusion
Inertia determination
Car Top Testing