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by Jkwashbourne
April 12th, 2013, 12:33 pm
Forum: Mission Possible B
Topic: Cal State!
Replies: 0
Views: 1204

Cal State!

Aiming for just barely north of 1200 points. See you there!
by Jkwashbourne
March 17th, 2013, 8:17 pm
Forum: Mission Possible B
Topic: Domino sizing
Replies: 7
Views: 1923

Re: Domino sizing

I agree on stability. We get around 85 cm stable, much past that things get wobbly. If you are going for the whole distance it must be even worse. We used a telescope, but I think a carefully designed scissor would be the way to go.
by Jkwashbourne
March 17th, 2013, 5:19 pm
Forum: Mission Possible B
Topic: Don't be 2nd tiered because of motors
Replies: 7
Views: 1857

Re: Don't be 2nd tiered because of motors

... I agree that several questions in the clarification are removed and certain ones are kept, I have no idea why. Why not leave everything intact for everyone to see. Maybe it gets too prohibitively large, I don't know. hogger, could you please point to where you see the clarifications you discuss...
by Jkwashbourne
March 17th, 2013, 5:14 pm
Forum: Mission Possible B
Topic: Domino sizing
Replies: 7
Views: 1923

Re: Domino sizing

just re-read again, after studying it intensely before regional. seems like falling off is the only problem, so if you make the platform bigger and put the dominoes one domino width from the edge, and of course have a reasonably stable lift, it should be fine.

plus, just because you can!
by Jkwashbourne
March 17th, 2013, 5:11 pm
Forum: Mission Possible B
Topic: Domino sizing
Replies: 7
Views: 1923

Re: Domino sizing

If the design of your final task is stable, why not go for it? 20 points is 20 points. We lifted 10 up safely at regional and will most likely go for 10 at state. Has there been any official clarification on what happens if one falls off? We think the official at regional counted what was left on to...
by Jkwashbourne
March 17th, 2013, 3:50 pm
Forum: Mission Possible B
Topic: Domino sizing
Replies: 7
Views: 1923

Re: Domino sizing

Also, now we really have to go look for dominoes as close to 1 cm thick as we can find !
by Jkwashbourne
March 17th, 2013, 3:44 pm
Forum: Mission Possible B
Topic: Domino sizing
Replies: 7
Views: 1923

Domino sizing

I wanted to call attention to this update to the domino size rule. We ground our dominoes for regional to meet the size requirements, and I am glad I caught this before the state competition.

http://www.soinc.org/node/479
by Jkwashbourne
February 28th, 2013, 8:40 am
Forum: Mission Possible B
Topic: Mission Possible B
Replies: 98
Views: 16084

Re: Mission Possible B

An interesting point here: I was convinced the judges would come around with a volt meter and test the voltage, but they did not. They go by the labeled voltage on commercial batteries. I was talking to a team that had timed using a 9v cordless drill battery that they decided not to run because it p...
by Jkwashbourne
February 21st, 2013, 4:45 pm
Forum: Mission Possible B
Topic: Mission Possible B
Replies: 98
Views: 16084

Re: task c

The rules say that hazardous liquids are not permitted. Seems a stretch to classify water as hazardous in such a small quantity.
by Jkwashbourne
February 20th, 2013, 5:46 pm
Forum: Mission Possible B
Topic: Mission Possible B
Replies: 98
Views: 16084

Re: task c

We used a fan to move a small plastic "boat" on a "pond" (box of water).

Another idea might be to move a ball bearing that just fits inside a hose.
by Jkwashbourne
February 11th, 2013, 10:56 am
Forum: Mission Possible B
Topic: Mission Possible B
Replies: 98
Views: 16084

Re: Please help!

below is a great link for the homemade gears. we used 1/2 inch plywood and it worked very well. I also saw some gears made from styrofoam but I dont know how they performed. You can buy a coping saw at home depot for less than 10 bucks and use that to make the cuts. A power jig saw is much easier bu...
by Jkwashbourne
February 10th, 2013, 10:43 am
Forum: Mission Possible B
Topic: Timing
Replies: 13
Views: 2435

Re: Timing

it would be cool to have a forum where the volunteer judges could contribute their thoughts on some of these issues. especially when fresh off the events. with a disclaimer about "not official etc etc etc".
by Jkwashbourne
February 10th, 2013, 9:09 am
Forum: Mission Possible B
Topic: Timing
Replies: 13
Views: 2435

Re: Timing

Here is the relevant rule: "electrical components are limited to batteries, wires, mechanical switches, and/or up to 3 motors. No computers, integrated circuits, or any other unlisted electrical components are permitted in the device" We think a homemade resistor is nothing but a long wire...
by Jkwashbourne
February 10th, 2013, 8:47 am
Forum: Mission Possible B
Topic: Timing
Replies: 13
Views: 2435

Re: Timing

our final task was driven by an electric motor, and we were able to change the timing by varying resistance. one of the coolest parts of the project was building a wire wound resistor to do that.

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