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by ichaelm
May 5th, 2014, 6:46 pm
Forum: 2014 Invitationals, Regionals, and States
Topic: Pennsylvania 2014
Replies: 349
Views: 47217

Re: Pennsylvania 2014

I would like to hope there was a miscalculation. But what has happened is pretty big. From what I hear, many of the schools who were in the Top 5/6 at states for the C Division are very disappointed in what is going on. Many coaches have been trying to contact the State admins trying to get clarifi...
by ichaelm
February 25th, 2014, 3:48 pm
Forum: 2014 Lab Events
Topic: Technical Problem Solving C
Replies: 29
Views: 9553

Re: Technical Problem Solving C

Exactly! I was looking for something about countercurrent heat exchangers, or really anything besides concurrent flow.
by ichaelm
February 23rd, 2014, 11:34 am
Forum: 2014 Lab Events
Topic: Technical Problem Solving C
Replies: 29
Views: 9553

Re: Technical Problem Solving C

Here's an interesting question that zero out of 20 teams got completely correct at CWRU yesterday: For a general heat exchanger, consider the inlet temperature of chamber A to be T1A, the outlet temperature of chamber A to be T2A, the inlet temperature of chamber B to be T1B, and the outlet temperat...
by ichaelm
May 20th, 2013, 10:02 am
Forum: 2013 Lab Events
Topic: Shock Value B/Circuit Lab C
Replies: 214
Views: 30816

Re: Shock Value B/Circuit Lab C

Hey, I showed up at 2:59. So really I was early! :P
by ichaelm
May 19th, 2013, 5:52 pm
Forum: 2013 Lab Events
Topic: Keep the Heat B/Thermodynamics C
Replies: 494
Views: 56088

Re: Keep the Heat B/Thermodynamics C

You're right, it is similar to a half-life. This is covered by Newton's law of cooling, which states that the rate of heat loss of a body is proportional to the difference in temperatures between the body and its surroundings, according to wikipedia. So if the rate of change in temperature is propor...
by ichaelm
March 2nd, 2012, 7:13 pm
Forum: 2012 Build Events
Topic: Robot Arm C
Replies: 531
Views: 56512

Re: Robot Arm C

Sounds like an interesting discussion, and it reminded me of something. When I was in 6th grade and Borders was still around, I bought a book called "Junkbots, Bugbots, and Bots on Wheels." I still recommend that book to anyone who wants to learn about building robots as a hobby. One of the extremel...
by ichaelm
March 2nd, 2012, 2:41 am
Forum: 2012 Build Events
Topic: Robot Arm C
Replies: 531
Views: 56512

Re: Robot Arm C

That reminds me. I used to recommend lithium polymer batteries, because they're getting cheaper and can supply enough current for almost anything. I don't recommend them anymore, if you're the kinda person who makes stupid mistakes like me. Because sometimes you forget to balance them. And then some...
by ichaelm
January 30th, 2012, 4:59 pm
Forum: 2012 Build Events
Topic: Robot Arm C
Replies: 531
Views: 56512

Re: Robot Arm C

Oh, that's pretty cool! But still, I see you point to speed as the advantage. My teammates haven't had a chance to practice with a real field compliant with the rules, but my my judgement, it shouldn't be a problem to make 3 minutes. I guess that depends on your controller, and practice.
by ichaelm
January 30th, 2012, 4:26 pm
Forum: 2012 Build Events
Topic: Robot Arm C
Replies: 531
Views: 56512

Re: Robot Arm C

I think the better question to ask here is WHY make it autonomous, not why not. A team that gets maximum score with an autonomous 4-motor robot will not beat one that gets maximum score with 4 motors that's manually controlled. Time is not scored. It will come down to the quality of technical docume...

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