Physics

Crave The Wave

Wind Power - Div B

(section: 3 / paragraph: b / line: 1)

2015-11-12 15:33 Is the CD that the blades are mounted to only held on to the generator by the detent balls on a CD player or can extra support be provided such as double sided adhesive tape to strengthen the joint?

Yes, as long as the tape is easily removable and does not impact other subsequent teams' testing.

2016-03-04 16:07 Can holes be drilled in the CD such that the blades can be affixed to the CD with plastic nuts and bolts?

Yes, as long as the holes are filled with a fastener used to attach a blade. No holes or slots may be used for the purpose of reducing the mass of the CD.

(section: 3 / paragraph: b / line: 2)

2016-03-29 12:43 If the CD is sanded to create a rough surface so that it can bond/glue strong and firm to the blades, would this be considered a "modification of a CD"?

No, this would not be a modification of the CD. Light sanding to create a rough surface for gluing purposes only where the blade is mounted is fine. Sanding the whole CD is not allowed. The local event supervisor will determine if a modification has been made to the CD.

(section: 3 / paragraph: f / line: 1-2)

2016-03-29 12:34 The Rules state no part of the blade assembly may extend BEHIND CD for 3cm. This has been interpreted to mean that blades cannot be within 3cm both IN FRONT and BEHIND.

The limitation is only for the side of the CD that is facing the motor/generator.

(section: 4 / paragraph: f / line: 2)

2016-03-04 15:54 At what time in the testing is the final position of 5cm to be measured and Is this a construction violation ?

It will be measured just prior to the measurement period starting. The measurement period will not begin if it is closer than 5cm. There is no other penalty.

(section: 4 / paragraph: G / line: 2)

2016-03-04 14:58 May students push the blades by hand to initially get them spinning (if necessary) in the testing period, prior to the declared measurement period.

Yes, see 4.f. They may push the blades by hand to initially get them spinning but they may not touch the blade assembly during the measurement period.  and initially get them spinning.

(section: 4 / paragraph: l / sub-paragraph: ii / line: 1)

2015-11-12 15:35 Rules state that "Power generator general questions...."Does this refer to the general question of how electrical power is generated in each of these types of power plants or specifically to the generator itself?

Anything related to power generators in general is a valid question, which could include aspects of the power plants.

(section: 4.f. / line: 5)

2016-03-29 12:22 If during the 3 minute testing period, but not yet in the 30 second measurement period, the whole blade assembly falls off the mounting equipment provided by the event supervisors, can the students reattach their blade assembly?

Yes.

Air Trajectory

(section: 2 / paragraph: j / line: 1)

2016-02-11 11:40 Regarding the use of electronics. Can an electric drill be brought to detach the weight and subsequently (after impound/before event) reattach the weight before launch? If so, does it need to be impounded?

Yes a drill may be used as a tool and it does NOT need to be impounded. Please keep in mind that power outlets might not be available close to the competition area.

(section: 3 / paragraph: c / line: 1)

2016-01-29 20:17 Can we re-inflate the air chamber after launch (ie: soda bottle, when it's crushed) using ambient air, to go back to it's original shape, or does it need to re-inflate itself?

Yes,you may re-inflate the air chamber provided the chamber is at ambient pressure at launch.

(section: 3 / paragraph: d / line: 2)

2016-02-09 20:08 3d states an 80cm cube may be used at "any orientation." This is not possible due to the furtherrestrictions in 4a.

Correct, if teams choose to use the max 80cm size, they are then limited in the orientations they may place the device in. Smaller devices will have more possible orientations available.

(section: 3 / paragraph: e / line: 2)

2016-02-20 09:39 Can the triggering device be a rope permanently attached to the mass meaning it cannot detach from the mass?

No, the triggering device separates itself from the launch device. Any parts remaining that are attached to the launching device after a shot are considered part of the launching device and must follow Rule 4c.

Correction – Yes, the triggering device may stay attached to the mass after launch.

(section: 3 / paragraph: f / line: 1)

2016-03-02 22:05 May beer pong balls be used as projectiles. Beer pong balls are heavier, don't bounce as much, and are less affected by air resistance and wind. Is this a valid projectile according to the rules?

The balls should be of the type listed in Rule 3f. In the case of beer pong balls, if the original packaging somewhere states they are 'ping pong' balls, they are acceptable. Teams should bring the original packaging if there is a question.

(section: 3 / paragraph: h / line: 1)

2015-12-14 10:24 Can the calibration of the device be electronic, if it is not a physical part of the device? (Meaning, it can be added, calibrated, and then removed before the firing of the device).

Yes, tools are allowed to be electronic. Electronic devices may only used during calibration.

(section: 3. / paragraph: f / line: 1)

2015-11-12 14:04 Team must provide unmodified light weight plastic or foam golf balls to be used as projectiles. Are practice plastic golf ball with holes on the side consider "Unmodified"?

Yes, plastic golf balls purchased with holes in them are considered unmodified and are allowed.

(section: 4 / paragraph: b / line: 1)

2016-01-15 21:16 May competitors be in front of the launch area BEFORE a launch? Specifically: Are competitors allowed to walk behind targets to instruct their partner in aiming their device?

General rule #1 applies (https://www.soinc.org/ethics_rules). There is no prohibition in the rules about approaching or going behind the targets prior to a launch during their 8 min. time period (rule 4.f.) During a launch they must follow rule 4.b. Teams may be penalized if they disturb the competition area.

(section: 4 / paragraph: d / line: 2)

2016-03-19 20:51 Is the "sand, cat litter, or similar substance" around the target, part of the target? Should we be penalized for touching said substance?

No, there is no penalty for contacting the sand etc. The sand etc. is not part of the target. It's purpose is to identify where the projectile landed. Teams should avoid touching it though as it could cause a false mark to appear that makes it difficult for the event supervisor to measure the point of impact.

(section: 4 / paragraph: f / line: 1)

2016-01-14 22:09 Can competitors use a laser as a material to help with setup, adjustment, and calibration of the device? General rules about laser use will be followed and the laser impounded.

Yes, lasers may be used as a tool for setup, adjustment, & calibration of the device. They must be removed prior to launch. The laser policy posted on the National website must be followed.

(section: 4 / paragraph: h / line: 1)

2016-01-15 21:19 Is a rope which extends from the device to the target considered a calibration tool?

A rope can be considered a calibration tool as long as it is removed from the device during each launch.

(section: 4 / paragraph: i / line: 1)

2016-02-09 20:24 If a team qualifies for 2 bucket shots, must the bucket shot be constant for both shots or could the event supervisor select different locations for each bucket shot?

There is only 1 location for the bucket which is the same for all teams and all launches.

(section: 4. / paragraph: e. / line: 2-5)

2016-01-15 21:26 The rule says a distance of at least 2.00 m must separate the targets. If the near target is on the 2 m centerline would it be legal for the far target to be 2m to the right or left perpendicular to the centerline 2 m mark?

Yes, that is allowable.