DBF 2013 IACAS Presentation
DBF 2013 IACAS Presentation
DBF 2013 IACAS Presentation
IACAS Presentation
19.02.14
Design personnel
Mr.
Mr. Shlomo
Shlomo Tsach
Tsach Mr.
Mr. Dolav
Dolav Simon
Simon
(Advisor)
(Advisor) (Building Assistant)
(Building Assistant)
Chai
Chai Cramf
Cramf
(Team
(Team Chief)
Chief)
Raz
Raz Margi
Margi Eli
Eli Hayoon
Hayoon Yuri
Yuri Kaluzhny
Kaluzhny
(Geometry)
(Geometry) (Propulsion)
(Propulsion) (Performance)
(Performance)
Dana
Dana Weiss
Weiss Christina
Christina Ospanov
Ospanov
Kinneret
Kinneret Lipovski
Lipovski Robert
Robert Landau
Landau
(Weight and
(Weight and (Logistics, Landing
(Logistics, Landing
(Aerodynamics)
(Aerodynamics) (Structure)
(Structure)
Balance)
Balance) Gear)
Gear)
Noam
Noam Neeman
Neeman David
David Abrevaya
Abrevaya
(Logistics,
(Logistics, In-board
In-board (Report)
(Report)
Layout)
Layout)
Background
• Aircraft must perform all missions and complete a successful landing to get a score.
• Aircraft must undergo physical and structural inspection prior to being allowed to fly.
Aircraft must prove that all payload configurations fit in during the tech inspection.
Mission requirements
Missions
Mission 2: Aircraft's ability to carry heavy Carry as many Mini-Max stores as possible
Stealth Mission weight. internal to the aircraft in the main fuselage.
Complete a 3 lap internal-stores flight.
Aircraft's ability to carry hidden
ammunition.
Overall score will be computed from Written Report Score, Total Flight Score and Rated
Aircraft Cost using the formula:
Written Report Score L S Tmin max EW1 , EW2 , EW3 X max 2Ymax
Score 2 4 6 RAC
RAC Lmax S max T 10
Tandem
Conventional
Design Concepts
Configuration 1 – Upper surface blowing
The motive : Create a NASA based double propeller aircraft (NASA TN D-4856) in order to
achieve great speed and great lift in a short amount of time and thus to overcome the austere
field restraint.
Disadvantages :
• Geometry and double propeller’s high weight.
• Propellers spin disability due to limited current on propulsion systems (loss of the USB effect).
• Difficulty to perform accurate analysis for a model aircraft – drag polar and thrust.
• Difficulties in flight tests.
Design concepts
Configuration 2 – Tandem
The motive : Create a relatively small “double winged” aircraft, rather then conventional
“wing-tail” configuration. The purpose of such aircraft is to increase the planform area and
gain high lift without extreme extension of the wing span nor the length of the aircraft.
Disadvantages :
• Unfamiliar configuration, Take-off in 30 ft is not guaranteed.
• Limited time and budget.
Design concepts
Configuration 3 – Conventional
• Meets all restraints and provides decent
mission performance.
• Realistic to analyze – realistic
calculations and predictions.
• Easy to manufacture – saves time, and
time is of the essence.
• Simplicity allows adding features and
improvements.
Airfoil selection
Wing profile
Airfoil selection
Wing profile
Batteries selection
Batteries
parameters and reading actual user reviews • C-Rate: 10C (15 amps)
we have decided to use the Elite 1500mAhr. • Weight: 23 gram (29 cells total)
• Voltage: 1.20v.
• Chemistry: NIMH
Motor selection
600W 50W
Most brushless motors manufacturers
When testing models:
focus on high current, low voltage
• Power – range.
models (For our power output
category). The only manufacturer, • Capable of 35V +.
offering motors that can handle high
• Approximately 2000-2500 Propeller RPM
voltage is Neumotors.
(After gear reduction).
Propulsion
Propulsion
45
Thrust [N] vs Air Speed [m/s] - 20A Current Limit
1905 2.5Y - 6.7:1 Gearbox -
40 22x11
• Comparison of 35
1905 2.5Y - 6.7:1 Gearbox -
21x14
30 1905 3Y - 4.4:1 Gearbox -
different configurations 19x10
Thrust[N]
25 1905 3Y - 5.3:1 Gearbox - 22x11
20 1905 3Y - 6.7:1 Gearbox - 24x15
– Motor, gear box and 15
10
propeller. 5
0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
Air Speed[m/s]
60
Thrust [N] vs Air Speed [m/s] - Full Throttle
1905 2.5Y - 6.7:1 Gearbox -
55 22x11
50 1905 2.5Y - 6.7:1 Gearbox -
45 21x14
40 1905 3Y - 4.4:1 Gearbox -
19x10
35
Thrust[N]
• Flight tests showed that the aircraft exceeds the austere field restraint.
• Heavy and clumsy, lack of performance.
• The aircraft’s weight and drag overcame its’ large planform area.
“Mazlatov” - Drawings
Standard views
“Mazlatov” - Drawings
Components’ view
“Mazlatov” general parameters
Arrival & preparations
Craig
• The pre-flight tech inspection is a series of tests run by an AIAA officials which are meant to
assure the aircraft’s integrity and verify that all competition rules and restraints are carried out.
The inspection included structural, electronics and payload tests.
• ‘Mazlatov’ was qualified to fly on the first attempt.
3.4 Results
3.5 Other designs