I builded the fill tube folowing ideas of this UKHAS wiki page.
As I don’t have something to create a grove, I used a PVC waste water plug that already have some kind of grove by design.
- I strongly glued the flexible fill on it.
- To close the remaining space, I added some wet newspaper sheets to create a temporary “wall”.
- I used a hot glue gun, and let the hot glue fall all around the both sides of the newspaper.
- I drilled a small hole to attach a nylon cord to be used for weighting and to secure to the ground bebore launch.
I was very happy with it.
Looks strong and very easy to build.
The payload is made with foam, then protected with flashy orange tape for maximum visibility (in the air and on the ground).
A label explaining it is harmless, with contacts details is outside and inside the box.
The payload contain:
- Raspberry Pi Model A
- Some unused connectors have been removed (RCA..)
- Running Raspbian
- MicroSD 8GB
- SD to microSD adapter
to limit the risk of the regular SD to be moved away of the slot.
- Additional capacitor (more details provided in a future post)
- default 3.3V regulator (could be improved for a future flight)
- USB Hub
- 2 x Prolific PL2303 USB toSerial for Radio and GPS.
- Raspberry onboard serial interface on GPIOs used for administrative tasks.
- GPS UBLOX MAX-7Q
- Can go over the 18 Km CoCom limit
- Commands sent to enable the “Flight mode”
- Radio Radiometrix NTX2 434.650 MHz
- Homemade quater wave ground plane antenna
- 3G USB Key Huawei K3565 used to send coordinates by SMS on the ground
- Relay to control power of 3G/SMS USB Key (powered only after burst and under 2000m)
- Raspberry PI Camera - 5MP
- Canon A590IS - 8MP
- Battery Romoss 5V / 5200 mAh
- Braided Nylon Cord 1mm
Required by French Civil Aviation Authority / ICAO - Separation force limit 230 N