(section: 3 / paragraph: E / line: 2)
Chinook style helicopters are still legal under the 2014 rules, but will not receive any bonus. 3e defines a rotor as a blade or blades which rotate around a vertical axis. Each rotor may have it's own vertical axis.
(section: 3 / paragraph: e / line: 2)
Rotors are defined in rule 3.e as one or more blades that rotate on a common path around a vertical axis. The rules do not include any requirements for the amount of vertical separation between blades necessary, so blades that are separated to an unlimited extent may still qualify as being part of the same assembly. One blade could be on the top of the helicopter or motorstick and another on the bottom, but still be connected in a single rotor assembly. The "path" referred to in rule 3.e does not indicate that every blade must occupy exactly the same volumetric space on each rotation. Instead, it means that when an assembly is rotated around an axis, each blade also processes around that axis. A key test of whether blades are part of the same rotor are to determine if they are rigidly connected to each other. If one blade cannot rotate independently of another blade, they are on the same rotor and constitute a multi bladed rotor. To test if a rotor is single bladed, the students should demonstrate that it can rotate independent of all other blades on the helicopter without damage to the helicopter.
(section: 3 / paragraph: f / line: 1)
The 15cm referred to in rule 3.f is an exception for single-bladed rotors only, as they have less lifting area and their swept diameter is extremely difficult to measure. Any rotor assembly with more than one blade must have a diameter less than 25cm. If a rotor only has a single blade, it must have a radius less than 15cm.
(section: 3 / paragraph: F / line: 1)
No, the pre-inspection is not the only time in which a device must be within compliance of the rules. It must remain in compliance throughout testing. As such, if a Helicopter rotor design functions as a two-bladed rotor during flight, it will be judged as a two-bladed rotor. This means the 25 cm rotor diameter limit will apply and the 10% bonus will not.
(section: 3 / paragraph: f / line: 1-3)
Yes, the other components referred to as "blades" above are not blades as they do not provide lift, they are counterweights. Only the covered surface counts as a blade and presuming all other requirements are met, will count as a single bladed rotor.
(section: 3 / paragraph: F / sub-paragraph: I / line: 3)
No, the axis of rotation in this situation divides the covered region into two separate lifting surfaces, meaning two separate blades.
(section: 4 / paragraph: I / line: 3)
The rules do not mandate any amount of time for hang-ups to continue legal flight time. Whether the rotors are supporting the weight of the helicopter or not is the only factor determining whether a flight is over or not and this will be up to the judgement of the event supervisor at the individual tournament. We cannot comment on a specific scenarios or occurrences without having actually been physically present.
(section: 4 / paragraph: j / line: 2)
This will be up to the judgement of the event supervisor. There are simply too many potential scenarios based on local conditions and individual behavior to predict every possibility.