Quadrocopter Frame Design
A wooden frame like from Hobbyking (see Link) is functional and cheap. But after several crashes gluing will no longer help, and you have to buy a new one. The landing gear is very weak. The best what you can take over to your next frame are the plastic screws and spacers.
A good design I have seen is from Arducopter, see Link. Just the price $170 is a little bit high.
The same is for the Aeroquad Frame made mainly from aluminum, see link (about $200).
An Airframe made mainly from Carbon-, Fiberglass for $95 is a bit cheaper.
What you can see with those commercial frames, there is a trend for an easy and quick repair 
.
2012 - This Quadrocopter is given up, because of the lack of flight stability.
2014-12 - A new EPP frame with All-In-One Controller with GPS was build up. This time the flight stability was OK, see QuadrocopterFrameEPP.
A click on the photos will enlarge them.
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Alu / Gfk Frame
At my second quadrocopter frame my design goal was:
- Good weight to lift power ratio
- Easy to build
- Cheap standard parts
- Motor to motor distance = 450 mm
Weight < 1 kg, total: 950 g
- Weight, frame: 300 g (with current distribution)
- Weight, alu tube 10x10x1000 mm: 104 g
- Weight, Gfk plates 100x100x1.5 mm, 2 pieces: 57 g
- Weight, landing gear T-Rex 500: 53 g + 4 sets screws M3x30 + 3x nuts = 10 g
- Housing box for electronics: 50 g
Battery LiPo 3S3000, 240 g
- Motor 2213N, 4 x 54 g = 216 g
- ESC 4 x 12 g = 48 g
- Propeller 9 x 5" HD + prop saver + O-ring 4x 12 = 48 g
- Electronics 100 g
- Weight, frame: 300 g (with current distribution)
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The ESC (MPX, see Link) and battery plugs (XT60, see Link) are glued to the upper center plate (bottom) first with UHU-POR, after wiring additional with hot glue.
The voltage distribution wires are crossed in the center. There, the insulation is partially removed, and the connection is soldered.
The current sensor is mounted with 2 screws M2 x 10 mm.
The TURNIGY 3~8S Voltage Detector (see Link) is mounted via velcro band to an angle.
Two cables are routed to the electronics:
- Battery voltage for electronics supply and voltage measurement.
- Current measurement signal plus +5 V supply for the sensor.
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The landing gear was taken from a T-Rex 500, and ordered via Ebay (see Link).
The battery was mounted in between, see pictures on the right:
The landing gear was mounted via M3x30 mm screws to the bottom center plate.
The lower center plate got 4 cutouts 5 x 12 mm for Battery Velcro Strap (2pcs/bag) (see Link) to hold the battery.
Above the battery 3 stripes of self adhesive rubber profile (windows seal) were taped, to stop the battery from moving.
The Shield board on top of the Arduino Mega board was mounted with screws and posts made from Nylon. In between is the flipped over top cover of the housing box.
For the metal screws Hex locknuts (see Link) are used only.
Links
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-- RudolfReuter 2011-10-05 04:02:09
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