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by old
January 10th, 2011, 11:39 pm
Forum: Towers B/C
Topic: Efficiencies
Replies: 270
Views: 38867

Re: Efficiencies

I'm sure this is a relatively stupid/simple question, but is there a certain way you all pour in the sand. If a lever system is used to let the sand fall in, would you want to go slow, then faster, then switch back to slow? Letting the sand in slow seems like it would make your tower sustain the we...
by old
December 10th, 2010, 2:54 pm
Forum: 2011 Build Events
Topic: Sumo Bots C
Replies: 472
Views: 54280

Re: Sumo Bots C

You need two extra sets of crystals if you are using 27 MHz, 49 MHz, or an older 75 MHz transmitter. The newer 75 MHz transmitters are digital, and allow you to select the specific frequency by setting it on the transmitter and then setting a dial on the receiver. 2.4 GHz transmitters automatically...
by old
October 26th, 2010, 10:47 pm
Forum: 2011 Build Events
Topic: Sumo Bots C
Replies: 472
Views: 54280

Re: Sumo Bots C

I think I understand what the maximum voltage of the batteries means, except how they are going to determine it. The nominal voltage of a NiMH battery is 1.2 volts per cell but the actually fully charged voltage is significantly higher than that (1.4 to 1.5 volts per cell). THe same phenomenon appli...
by old
October 22nd, 2010, 9:01 pm
Forum: Towers B/C
Topic: Balsa or Bass
Replies: 82
Views: 24812

Re: Balsa or Bass

In general bass you buy at the hobby store is stronger than balsa you buy at the hobby store, but a good piece of balsa has the highest strength to weight ratio of any wood. Bass comes in a much small range of densities so one could say that bass is more consistent than balsa, but since you will nee...
by old
October 18th, 2010, 9:04 pm
Forum: Towers B/C
Topic: Designs
Replies: 276
Views: 61009

Re: Designs

Here is a link to an online tool for calculating forces in 3-D (space) trusses: http://www.nexote.net/nexote/3D%20Truss%20Analysis%20Notebook/ . You might find it useful for designing towers. The website permits users to ask, if needed, for help for using the tool. If you want to model your tower a...
by old
October 16th, 2010, 5:34 pm
Forum: Towers B/C
Topic: Glue
Replies: 58
Views: 15414

Re: Glue

I used a high power hot glue gun and gorilla glue
Very funny! I know you were joking around but remember that some of the people reading this forum really don't know what is a joke and what is serious.
by old
October 16th, 2010, 5:29 pm
Forum: 2011 Build Events
Topic: Sumo Bots C
Replies: 472
Views: 54280

Re: Sumo Bots C

I was wondering what kind of speed controllers i would need if i was using 2 12v gear-motors with a nominal current of 1.5A and a stall current of 148A each. What kind of specs should they have? Right now we are trying 2 12A continuous 45A peak Controllers but that is probably not nearly good enoug...
by old
October 6th, 2010, 12:53 pm
Forum: 2011 Build Events
Topic: Sumo Bots C
Replies: 472
Views: 54280

Re: Sumo Bots C

That's quite a good price, if you can get reasonable shipping. Care to share your source? We look on ebay in the "toys and Hobbies" section under Radio control parts, engines (I am not on Ebay right now so this isn't exact) and then search LiPo or battery if you are looking at other types. You will...
by old
October 4th, 2010, 11:33 am
Forum: Towers B/C
Topic: Glue
Replies: 58
Views: 15414

Re: Glue

Would you suggest buying a precision applicator (those long thin tubes)?
I cannot see how you could apply a sufficiently small amount of glue straight out of the bottle or tube.
by old
October 4th, 2010, 11:28 am
Forum: Towers B/C
Topic: Testing Apparatus
Replies: 26
Views: 8704

Re: Testing Apparatus

I forgot to mention, for the question that is more important to the builders, a testing apparatus that you can use to see how well your tower is doing, I have some ideas. One of the big problems when testing these structures with a simple bucket of sand is that the tower breaks so fast that even wit...

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