The GFS-UAV model N-01A
A Coanda effect flying saucer
created on March 10, 2006 - JLN
Labs - September 15, 2006
Toutes les
informations et schémas sont publiés gratuitement ( opensource
) et sont destinés à un usage personnel et non commercial
All informations and
diagrams are published freely (opensource) and are
intended for a private use
and a non commercial use.
You will find below the full plan of the GFS-UAV model N-01A and a detailled tutorial to help you to replicate my GFS UAV...
Click
here to see a 3D view video about the GFS-UAV N-01 design (1.6
Mb)
Below, the specifications and the performances of my GFS-UAV N01A (the smaller model).
The engine is a brushless motor AC 28/7-30 D brushless motor from
MP JET.
| Number of cells | 6-9 or 2-3x LiPol |
| RPM per Volt | 1100 |
| Maximum recommend speed (min-1) | 12000 |
| Maximum speed (min-1) | 15000 |
| Maximum efficiency (%) | approx. 79 |
| Current of maximum efficiency (A) | to 15 |
| Short time currrent (A) | 20 |
| Internal resistance Ri ; (mW - miliohm) |
81 |
| Dimensions - diameter/length (mm) | 35,5/33 |
| Shaft diameter (mm) | 3 |
| Number of turns | 30 |
| Weight of drive unit (g) | 56 |
| Recommend propeller range | APC 7/3 - 9/6 (10/4,7) |
The brushless motor is
connected to a speed controler JETI Advance 30-3P
The best propeller
tested is an APC Electric 10 x 7 E from Landing Products.
The material
required to build the GFS-UAV N-01A is a 3 mm thick styrofoam
sheet XPS (Depron, Gediplac, Ectrupor) and some 1 mm diameter
carbon rods.
( click here to see some technical infos
about the Depron Foam )
The first step is to print the 35 pages below in PDF and assemble them so as to build the plan at full scale.
Click here to download the full plan of the
version 1.0 of the GFS-UAV model N-01A
Above all the GFS-UAV parts must be cut in the styrofoam with a
brand new cutter and with a low angle of cut.
To glue the
different parts, I recommend you to use UHU Por or special foam
Cyanoacrylate (CA) glue.
Above, after a computer designed phase, below, the true model is
now a reality (below).
The curved petals, the key of the Coanda effect, are carefully
assembled and glued on the main structure.
Be carefull to avoid cracks on the curved surface, click here to see the method to roll the petals on the
main structure.
The GFS-UAV N-01A hull is now finished and perfectly in line with
the CAD design...
The four moving flaps are ready to be assembled on the hull with
an adhesive tape as hinge.
The moving and fixed rudders for the yaw and the anti-torque
control are prepared and installed.
Above: A detailled photo about the main electronic parts
(receiver, gyro, Lipo battery, the pitch and bank servos)
Above : A detailled view about the command of the flap.
Above : A detailled view about the command of the moving
rudders.
There are 4 servos in parallel controled by the anti-torque piezo
gyro for the yaw control (see below)
The ready to flight weight of the GFS-UAV N-01A is 533 g with a
video camera transmitter on board.
I recommend strongly to add a streamlined body 280 mm diameter and 60 mm height and placed at 45 mm above the hull. You will notice that the efficiency will be greatly improved and the flight more stable. The streamlined body is made with a 3 mm thick depron foam and fixed with 8 carbon rods (2 mm diam) on the hull.
Above, you will find the correct setup for the all flaps.
I also recommend you to use at least a 150 Watts brushless motor with your GFS-UAV N-01A.
The best engine tested for the GFS-UAV N01 is the outrunner
brushless motor : AXI 2808/24 with
a propeller Graupner ECO CAM PROP 10/6" ( 25/15 cm ) ref :
2941.25.15
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The Lipo battery used is a PowerHouse (selected cells) 3S1P at
11.1V 950mA (rated for 25C)
Lipo pack weight : 96 g
See also :
For more informations, please contact Jean-Louis Naudin : JNaudin509@aol.com
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visitors since March 18, 2006
