Helicopters

Helicopters

admin Tue, 2008-08-12 08:59

What defines a single bladed rotor? Would a single stick of wood projecting out horizontally from the body be considered a "lifting surface" that "rotates on a common path around a vertical axis"?

What defines a single bladed rotor? Would a single stick of wood projecting out horizontally from the body be considered a "lifting surface" that "rotates on a common path around a vertical axis"?

admin Mon, 2016-11-14 21:21

No, that would not be considered a lifting surface. To be considered a lifting surface, it must contribute lift to the overall flying assembly. An easy way to demonstrate that would be to demonstrate flying it with and without the surface, if the surface is not present then the flight would be significantly different.

Are there any single bladed rotor configurations where the blade is directly connected to the motor stick that would be considered legal for the bonus?

Are there any single bladed rotor configurations where the blade is directly connected to the motor stick that would be considered legal for the bonus?

ceann Sun, 2017-03-12 20:57
Yes, there are valid configurations where a single bladed rotor attached to a motor stick can be legal for the bonus. Specifically, if there is only a freewheeling rotor on one end of the motor stick and is receiving power from the rubber band, generating lift. For example, if the single bladed rotor glued/affixed directly to the stick and that end of the stick has no other rotor blade(s) and has only a hook for the end of the rubber motor. However, if the rotor does not have any counter-acting resistance, it will receive no power and as such will not provide lift. The most likely arrangement for this would be a single blade attached to the side of a motor stick, with free-wheeling and directly powered rotors at either end. In this configuration, the single blade is not a rotor assembly and does not qualify for the bonus.

Competitors must construct the rotors themselves. If they design the rotors themselves can they use a 3D printer to make the part?

Competitors must construct the rotors themselves. If they design the rotors themselves can they use a 3D printer to make the part?

ceann Sun, 2017-03-12 20:33
Yes. According the General #1 and the 3D printer policy they are allowed.

Does timing stop immediately if helicopter hangs up, maybe temporarily, or can timing continue if helicopter dislodges within a short time say 10 seconds like AMA rules?

Does timing stop immediately if helicopter hangs up, maybe temporarily, or can timing continue if helicopter dislodges within a short time say 10 seconds like AMA rules?

ceann Sun, 2017-03-12 20:27
Science Olympiad is not the AMA and does not follow AMA conventions for timing. Timing stops when the judges determine the helicopter to no longer be supporting its own weight and as such, no longer be flying. This can be a tricky determination and is left up to the local supervisor, who is in the best position to actually observe the flight of the helicopter.

If multiple helicopters are brought to competition does each individual helicopter need its own flight log?

If multiple helicopters are brought to competition does each individual helicopter need its own flight log?

ceann Tue, 2017-03-07 19:34
No, students should have one flight log with all the data from all their aircraft.