This page shows another one tiny quad based on the CopterControl board (aka CC, thus the name of the airframe).
The CC is a little single-board product from the OpenPilot project. It has many features of its big brother, for example, the same USB bootloader to update firmware, the same USB and serial telemetry link, the same UAVTalk protocol to talk to the same ground station software (GCS), the same mixer settings, and many other uavobjects are also shared with full OpenPilot system.
But using the same powerful STM32 32-bit 72MHz CPU, it is only 8g (8.5 with servo headers fitted). And it fits perfectly for such small quads with only 4" props. Stay tuned!
Here is a whole ready thing. It uses 3.3v powered OrangeRX DSM2 Spektrum-compatible satellite which is under the CC board. You see 3 wires soldered to the CC which go to the Rx (GND, +3.3Vcc, serial input) and a grey antenna wire near the USB connector. Other build details are below.
February 09th, 2011. Finally received 4" props. So the building of the CCCopter is a matter of time. All parts are now in hands.
February 20th, 2011. The quad is ready. But there is a problem with propellers. They are mounted using original motor accessories - prop savers. And I have to do something with very high vibrations. Either replace prop savers by spinners (need to order them), or do something else. Still thinking...
Decided. Ordered 4 propeller adapters from ebay...
February 21th, 2011. The real problem was with highly unbalanced propellers. After that... See below flight video!
This flight is really first after propeller balancing. Absolutely no tuning was done, no settings were altered - just plug and play solution. Now when we see that it works, we can cut wires to save some weight. The video was cut unplanned, not such a good flight was expected. So sorry for the quality!
Motor to motor size
Weight without battery
Used battery weight
Total flying weight
Cutting some wires, it is possible to save few grams too.
Complete build instructions
Carbon Fiber Square Tube 750x3x3mm - 1pc
The frame design is quite simple but rigid enough for the size - 165mm motor to motor. It was assembled using one square carbon tube, 4 pcs of plywood and one glass fiber plate. Below are simple instructions.
Motors come with radial mounts and prop savers. But you have to order some prop adapters to have a solid system since prop savers give too high vibrations.
Those small 4" propellers have 4mm holes. They should be ok for the prop mounts, but in fact they aren't. So extra prop spinners are recommended (see below).
Since the last problem I have is with vibrations, I ordered those prop adapters from ebay. It seems that HK does not have 2mm to 4mm adapters, that's sad. But without good prop mounts vibrations are very high, and quad is unfliable (and even unholdable in hand, have to say).
Turnigy Plush 6A - 4pcs
These ESCs are programmable and are able to run at 400Hz update rate. Performance-wise, it is recommended to increase default 50Hz update rate to 400Hz via UAVObject Browser since the GCS Config gadget does not support 4 different rates yet.
MK plastic 15mm mouns - 4pcs
The MK plastic 15mm mounts were used to install the CC board. If you cut some wires then you even can use 10mm mounts. I didn't do that yet.
The brain of the quad is the CopterControl board. It is installed using plastic mounts and plastic nuts.
The CC supports Spektrum satellite protocol directly. But it requires 3.3v supply (there are also reports that it can handle 5.0v but I didn't try it). So I had to solder the satellite wires directly to the CC board instead of FlexiPort. Black wire goes to the ground, orange wire to the +3.3v Vcc (digital regulated +3.3v source is used), and grey wire goes to the Rx pin of FlexiPort. The receiver itself is placed between the central plate and the CC board, so only antenna wire is visible near the USB connector.
LiPo 800mAh 2S 7.4v
Any decent battery should be ok.
None at the moment.