- Three ultra micro servos at around 2.5g or less: I used the ones branded Blue Arrow. These allow for an easy fit of the propellers (motor shaft of 0.7 mm).
- An ultra micro receiver: I used DelTang Rx33. In any case, chose one below 2g and working on a single LiPo cell (commonly referred to as 1s). Actually many receivers do work on 1s, even if not documented as such. Make sure your servos' and receiver's connectors are compatible, or you're in for some soldering after all. Both the DelTang DSM2 receivers and the blue arrow servos come in a number of connector versions. Specialised online shops like Micron Radio Control. Plantraco or Aether Sciences RC can help in this.
- Obviously you will need a compatible transmitter. The simplest one with 3 or more channels will suffice.
- A 70 to 140 mAh 1s LiPo battery (and a suitable charger): The smallest batteries (around 2.5 g for a 70 mAh) are needed to keep the weight under 10g. A larger battery obviously gives you a longer flight time, but even as flight time is very dependent on flying style, it is easily half an hour with a 125 mAh (weighing 3.5g). A smaller battery will still easily last 15 min or more and it will make a latex balloon last longer (making room for more ballast to compensate for lost helium).
- Leads to connect your battery to your receiver (again the specialist RC shop can help in this).
- Three small propellers: I used the Plantraco 32 mm "butterfly" propellers . These are some amazing high performance tiny propellers that fit a 0.7mm shaft. The "AESH34 - Hélice Micro" from Aether Sciences RC looks very suitable too.
- A 1 mm carbon rod, about 30 cm long
- A piece of Depron, about 10 cm by 10 cm, 1 mm thick (if not available 3mm thick Depron can be used too). Some putty as ballast.
- Finally, you will need some cellophane tape (sellotape, scotch tape), a pair of small pliers, a couple of small elastic band, superglue and a pair of scissors. A scale, accurate to 0.1g or better, comes in handy. Soldering is optional.