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Re: Thermodynamics B/C Build
Posted: December 17th, 2018, 4:41 pm
by drcubbin
JoeyC wrote:There is a rule stating that the bottom of the beaker must be less than 12 cm from the top of the hole in your box, in order to allow the thermometer/probe to be read. The above mentioned person is pointing out that it might have been measured inaccurately in their invitational; that the 12 cm was counted instead of vertically, at an angle, so that they would be in violation of this rule.
Yep! All thermometers lean to the side, especially with the new larger hole this year. So when the thermometer is placed in the box, it will lean over. I was not there when the box was impounded, but I am guessing this is what happened since all three boxes measured <12cm with the thermometer vertical, but >12cm when leaning to the side. I hope that helps to clear it up
Re: Thermodynamics B/C Build
Posted: December 17th, 2018, 5:00 pm
by MattChina
Oh that makes sense, Got it now.
Re: Thermodynamics B/C Build
Posted: December 19th, 2018, 4:38 pm
by ElPotato
Any thoughts on the new cotton ball this year? imo I don't think it will make too much of a difference in the heat retention.
Re: Thermodynamics B/C Build
Posted: December 19th, 2018, 4:54 pm
by MattChina
ElPotato wrote:Any thoughts on the new cotton ball this year? imo I don't think it will make too much of a difference in the heat retention.
I think it will, I mean most of the heat loss is from the hole in the top.
Re: Thermodynamics B/C Build
Posted: December 19th, 2018, 6:15 pm
by JoeyC
The cotton ball works miracles. It has drastically changed predictions by at least 2*C.
Re: Thermodynamics B/C Build
Posted: December 19th, 2018, 6:57 pm
by ElPotato
JoeyC wrote:The cotton ball works miracles. It has drastically changed predictions by at least 2*C.
Looks like I'll need to recailibrate this year.
Re: Thermodynamics B/C Build
Posted: December 20th, 2018, 10:25 am
by didntstart
Do you guys build the box out of the foam? If not, what material works best for the exterior of the box?
Re: Thermodynamics B/C Build
Posted: December 20th, 2018, 10:28 am
by didntstart
Does the competition provide the cube?
Re: Thermodynamics B/C Build
Posted: December 20th, 2018, 10:46 am
by MattChina
didntstart wrote:Does the competition provide the cube?
What cube are u talking about? Also as for your previous question yes, I built my box out of insulation foam. Try not to double post next time.
Re: Thermodynamics B/C Build
Posted: December 20th, 2018, 12:10 pm
by MadCow2357
MattChina wrote:didntstart wrote:Does the competition provide the cube?
What cube are u talking about? Also as for your previous question yes, I built my box out of insulation foam. Try not to double post next time.
I think he meant the Thermo box
... If so, please read the rules a few more times...