CookiePie1 wrote: Creationist127 wrote:
That sounds like an okay idea. One piece of advice I would give: when you spray the spray foam around the beaker, there is a good chance that the beaker will get stuck inside. You might want to try covering the beaker with plastic wrap (a.k.a. cling wrap, Saran wrap, etc.) when you spray the spray foam, making it easier to get the beaker out.
How you build your device is really up to you, and it's more of a trial-and-error thing in nature. However, I would definitely advise NOT using plastic wrap around your beaker when spraying, because that will definitely get stuck. instead, use a paper towel or something, or you could even spray first and cut out space later. However, if you do choose to spray with your beaker inside, it will most likely be very difficult to insert and remove your beaker, so be careful with that.
IDK if youve already tried this, but I did a while ago, and it was awful! I made a box out of thin plywood, used corner brackets (or whatever they are called) and glue to hold the box in place, placed stilts for the beaker on the bottom and on the top of the lid (so that I would get the spot where I wanted it), wrapped the beaker in aluminum foil, drill a hole through the lid of the plywood box, clamped it down, and sprayed the stuff in there.
My main problem with this was I could NEVER get consistent results, and the more I tested it, the worse the results got too!!!! Just putting this out there in case anyone is trying it, I'm not an insanely good builder, but I promise I'm somewhat decent, and this did not work for me. I would recommend sticking with some type of foam. You may not get the k-value you want, but quite honestly, with the differing start temperatures of the water between competitors (as the ES's hand out water differently), its basically luck for that anyway. Focus on the prediction, its worth more points and less dependent on event supervisors messing up.