(section: 1 / line: 1)
Commercial kits may be used, as long as the SO building policy is followed: https://www.soinc.org/building_tools_policy
(section: 2, 3 / paragraph: 5, 6 / sub-paragraph: f, b / line: 1,1)
5.f. doesn't identify the target time for C only. It only mentions that the target length will be announced for Div. C only (since Div. B already knows the target length). The target time concept applies to both B and C. The reference to Div C is for the variable length that must be announced.
(section: 4 / paragraph: b / line: 1-2)
The maximum dimension of the skirt is the same as the device, 19.5 cm wide x 30 cm long, both inflated and deflated. Students may tuck the uninflated skirt under the device prior to inflation.
(section: 4 / paragraph: e / line: 1)
The propeller(s) must be enclosed in such a way that there are no holes bigger than 1/4" in diameter in the enclosure. A 1/4" dowel rod must not be able to penetrate the material.
(section: 4 / paragraph: g / line: 1)
The dowel can be any material, but by definition a dowel is a solid cylindrical rod, hence a straw is not allowed.
(section: 4 / paragraph: h / line: 1)
Yes, this would be allowed.
Yes, multiple batteries may be used as long as they are not connected in such a way that the voltage exceeds 9 V in any circuit. Separate 9 V circuits are allowed.
(section: 4 / paragraph: i / line: 1)
No. A breadboard with discrete resistors and/or basic transformers is not an integrated circuit. Note though that some types of resistors and transformers ARE integrated circuits and hence are not allowed.
No. As long as it is a fan typically used for cooling electronics or computers it does not need to be labeled as such.
Yes, an Arduino contains many integrated circuits and is not legal.
(section: 4 / paragraph: i / sub-paragraph: n/a / line: 1)
An integrated circuit is a circuit in which all or some of the circuit elements are inseparably associated and electrically interconnected so that it is considered to be indivisible for the purposes of construction and commerce. Most resistors and capacitors are not integrated circuits. Nearly all transistors and op-amps are integrated circuits.
(section: 4 / paragraph: i / sub-paragraph: N/A / line: 1)
It depends on the specific switch. Some switches are purely mechanical (i.e. utilize a potentiometer) and are allowed. Others are digital (i.e. utilize an integrated circuit) and are not allowed.
(section: 4 / paragraph: j / line: 1)
Yes because it is not hovering unless air is coming out. The air must have some way of escaping (i.e. it should need to be actively replenished for the device to work, not just be a sealed inflatable chamber).
(section: 4 / paragraph: j / line: 4)
There is no set distance it must hover. If an event supervisor, from a normal observation point without having to get up and close to the hovercraft, can visually see it move down when pushed, then yes it levitates.
(section: 4 / paragraph: k / line: 1)
No, as any remote control system would violate either the dimension requirements or the prohibition on integrated circuits.
(section: 5 / paragraph: f / sub-paragraph: N/A / line: 1)
(section: Constr / paragraph: i / line: 1)
Note there is an official rules clarification related to this, available at: https://www.soinc.org/official_rules_clarif The integrated circuit prohibition refers to all components (including voltage regulators / arduinos) other than those specified in the rules clarification.