Search found 155 matches

by goodcheer
February 13th, 2020, 7:22 am
Forum: Mission Possible B
Topic: The competition: participant may designate a Timer
Replies: 32
Views: 2313

Re: The competition: participant may designate a Timer

So, rule 4c speaks of bonus points for a designated timer which cannot use springs for power. What if we don't want these bonus points and we don't designate an action as a timer, can we have a step that uses springs for power? The answer is yes, since rule 3.a.v allows for springs. But, then we not...
by goodcheer
February 13th, 2020, 6:55 am
Forum: Mission Possible B
Topic: Weights
Replies: 2
Views: 240

Re: Weights

Different sizes of washers can be used and attached easily.
by goodcheer
October 12th, 2019, 9:32 am
Forum: Mission Possible B
Topic: Action ii: Wheel and axle
Replies: 3
Views: 960

Re: Action ii: Wheel and axle

Can I use two wheels and an axle? What if the ball goes up by 10 cm, and then also move horizontally? I don't know why you would need two wheels and an axle unless you are thinking of rolling a set of wheels which might not satisfy the wheel and axle usage as a simple machine. Usually wheel and axl...
by goodcheer
October 12th, 2019, 8:35 am
Forum: Ping Pong Parachute B/C
Topic: Ping Pong Parachute B/C
Replies: 355
Views: 31086

Re: Ping Pong Parachute B/C

[/quote] I'm curious to see the results of this test! I see pressures as high as 150psi quoted for 2L bottles...not sure what that means for 1L. I think the connection for filling the bottle will leak long before you can ever get to those high pressures but also not sure what the launcher will be. W...
by goodcheer
October 12th, 2019, 8:02 am
Forum: Ping Pong Parachute B/C
Topic: Ping Pong Parachute B/C
Replies: 355
Views: 31086

Re: Ping Pong Parachute B/C

d.The nose of the rocket must be rounded or blunt at the tip and designed such that when a standard bottle cap (~3.1 cm diameter x 1.25 cm tall) is placed on top of the nose, no portion of the nose touches the inside top of the bottle cap (see Figure 1). To satisfy this rule, can the ping pong ball...
by goodcheer
December 7th, 2018, 4:01 pm
Forum: Boomilever B/C
Topic: Interpretation of 3e
Replies: 36
Views: 4047

Re: Interpretation of 3e

ORIGINAL MESSAGE: What is the intent of "Which is more than 20 cm ..." Why not just state 20 cm (Div B) or 15 cm (Div C). ? if margin of error is deemed appropriate, add +/- .1 cm. As written, If a Div B apparatus were used to test Div C Booms, and a boom built to Div B specs were entered in the co...
by goodcheer
November 8th, 2018, 11:31 am
Forum: Battery Buggy B
Topic: Bonus Rule Interpretation
Replies: 5
Views: 1430

Re: Bonus Rule Interpretation

Hi, I am a first time coach for Battery Buggy event. Appreciate your help. I am trying to understand the bonus rule 1) Does this mean the event supervisor can place the first can "anywhere" in the middle of start and end points? That is, for example, if the target distance is 10 meters can the supe...
by goodcheer
November 8th, 2018, 11:03 am
Forum: Roller Coaster B
Topic: Roller Coaster B
Replies: 76
Views: 17888

Re: Roller Coaster B

SPP SciO wrote:I'm worried that the clips they're using would be problematic, because the ball would be obscured by it for a millisecond (possibly violating rule 3.c.).
Might could use zip ties or make your own out of the transparent tubing.
by goodcheer
March 10th, 2018, 2:37 pm
Forum: Roller Coaster B
Topic: GAP measurement In competition
Replies: 17
Views: 2814

Re: GAP measurement In competition

Our system was designed for a max jump. We have a short receiving track (>5 cm according the rule) followed by a turn then connected to a ramp with the finish line mark. The horizontal distance between the jump point and land point on the receiving track is about 50cm. In the regional competition, ...
by goodcheer
March 10th, 2018, 1:33 pm
Forum: Roller Coaster B
Topic: Vehicle bouncing off the track
Replies: 17
Views: 3109

Re: Vehicle bouncing off the track

I always assumed bouncing was specifically not allowed because of this video's loophole: https://www.youtube.com/watch?v=JVCJG14YrWc The bounce in that video is in the middle of the supposed gap jump. As soon as it lands on the bottom of the device and bounces, that would mark the landing point and...

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