Technology & Engineering

Technology & Engineering

admin Tue, 2008-08-12 08:58

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.

Robot Arm

Robot Arm

admin Thu, 2009-09-10 15:27

Can the end effectors be completely mobile on their own, without power from the arm. i.e. a small RC car attached to the base via a tether to the base?

Can the end effectors be completely mobile on their own, without power from the arm. i.e. a small RC car attached to the base via a tether to the base?

ceann Sun, 2016-12-18 21:08
No. This would not meet the definition of a robotic arm. Definition (checked in multiple sources) A robot arm is a series of rigid elements linked by rotary or translation joints. The tether is not a rigid link, nor is it a rotary or translational joint.

Towers - Div C

Towers - Div C

admin Thu, 2009-09-10 15:27

For the load scored bonus, the tower must be clear of the 29.0 cm diameter circle. Is this during setup only or also during loading (prior to tower failure)?

For the load scored bonus, the tower must be clear of the 29.0 cm diameter circle. Is this during setup only or also during loading (prior to tower failure)?

admin Thu, 2016-12-01 22:21

The Load Scored Bonus is awarded only if the tower is outside of the 29.0 cm diameter circle through the entire testing. If the tower sags inside of the 29.0 cm circle during testing but the bucket remains off the ground and the tower is still outside the 20.0 x 20.0 cm opening on the Test Base, testing will continue until failure occurs as defined in the rules.

Electric Vehicle

Electric Vehicle

admin Tue, 2008-08-12 08:59

Are hydrogen fuel cells and solar panels allowed to power the electric vehicle?

Are hydrogen fuel cells and solar panels allowed to power the electric vehicle?

ceann Mon, 2017-03-06 20:10
No to solar panels since by rule 2.b. the energy is not stored in the "battery. No, to hydrogen fuel cells since as far as we can tell there are no "common, commercially available" H fuel cells.

At a tournament I was told that because the axles of my vehicle did not fit the specified 30cm x 60cm space, I was given a construction violation even though the wheels/treads fit in the space. Is my vehicle legal in this configuration?

At a tournament I was told that because the axles of my vehicle did not fit the specified 30cm x 60cm space, I was given a construction violation even though the wheels/treads fit in the space. Is my vehicle legal in this configuration?

ceann Tue, 2017-03-07 17:52
2.f. clearly says the wheels/treads must fit within the dimensions. Axles aren't mentioned and don't impact the measurements.

Clearly batteries must be less than 9V, but can we use step-up regulator to generate 12 V?

Clearly batteries must be less than 9V, but can we use step-up regulator to generate 12 V?

admin Mon, 2016-11-14 20:22

No, the voltage across any two points ≤ 9 V as stated by the manufacturer labels. If a step-up regulator steps a 9V battery up to 12V, this would be a violation.

How is "leading part of the vehicle" defined? Is it the forward-most part in the direction of the vehicle's travel or the closest part to the Target Point?

How is "leading part of the vehicle" defined? Is it the forward-most part in the direction of the vehicle's travel or the closest part to the Target Point?

admin Fri, 2016-11-04 09:06

The "leading part of the vehicle" is the forward-most part in the direction of the vehicle's travel.

Is "backwards" motion any motion with a component in the direction of a vector starting at the finish and pointing toward the start, or is "backwards" a different direction?

Is "backwards" motion any motion with a component in the direction of a vector starting at the finish and pointing toward the start, or is "backwards" a different direction?

ceann Mon, 2017-03-06 20:59
Backwards motion is motion of the overall vehicle in the general direction opposite to the primary direction of travel during the run. If the vehicle is moving away from the start it is moving "forward" if the vehicle is moving towards the start then it is moving "backwards".

Is the bonus awarded if the vehicle moves one or both of the cans, but still passes between them? With 'move' defined as the distance between the cans after the run differs from the distance prior to the run, to the nearest 0.1 cm.

Is the bonus awarded if the vehicle moves one or both of the cans, but still passes between them? With 'move' defined as the distance between the cans after the run differs from the distance prior to the run, to the nearest 0.1 cm.

ceann Mon, 2017-03-06 20:42
Yes, as long as the bonus requirements outlined in 3.c. are met, the bonus will be awarded. It is awarded based upon the initial distance between the cans.

Is the vehicle permitted to be propelled backwards outside of the run time (as defined in 5k)?

Is the vehicle permitted to be propelled backwards outside of the run time (as defined in 5k)?

admin Thu, 2016-11-03 17:42

No. The rule is clear. ...please see rule 5.g.

What must fit within the 30.0x60.0cm rectangle? Simply the wheelbase where the treads touch the floor or the entirety of the wheels and treads, e.g. front edge of front wheel to the rear edge of the rear wheel?

What must fit within the 30.0x60.0cm rectangle? Simply the wheelbase where the treads touch the floor or the entirety of the wheels and treads, e.g. front edge of front wheel to the rear edge of the rear wheel?

ceann Mon, 2017-03-06 20:26
"The wheels/treads in the ready-to-run configuration must fit in a 30.0 x 60.0 cm space of any height" means that the entirety of the wheels and treads (front edge of front wheel to the rear edge of the rear wheel) in the ready-to-run configuration must fit in a 30.0 x 60.0 cm space of any height.

When is this distance measurement taken? If a vehicle crosses the 8.5 m line, stops (no visible forward motion) for > 1 s, then begins moving again toward the target, then stops permanently - is the distance measurement take from the 1st or 2nd stop?

When is this distance measurement taken? If a vehicle crosses the 8.5 m line, stops (no visible forward motion) for > 1 s, then begins moving again toward the target, then stops permanently - is the distance measurement take from the 1st or 2nd stop?

ceann Mon, 2017-03-06 21:10
Distance measurement is taken when the vehicle stops permanently.

When it says that the vehicle cannot be propelled backward, does that apply to recoil which occurs when a vehicle stops, specifically if the vehicle moves backwards despite the actual propulsion only being forwards?

When it says that the vehicle cannot be propelled backward, does that apply to recoil which occurs when a vehicle stops, specifically if the vehicle moves backwards despite the actual propulsion only being forwards?

ceann Sat, 2017-02-11 15:52
No, the minor recoil when a vehicle stops is not considered backwards propulsion. Ultimately it will be up to the event supervisor to determine if this movement was intentional to gain a benefit to the team.