User talk:Vincecate/BallHouse

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Truth is I found a 36 cm (14.2 inch) buoy on the beach that is just perfect for modeling this at 1/25th scale, so I will have to model it. And since I will be testing a model of this design I decided to write it up to match the model.  :-) The idea is growing on me the longer I think about it. Vincecate 03:35, 10 July 2008 (UTC)

How about making the sphere by spraying fibrous concrete (shotcrete) on an inflated balloon?--Vtoldude 19:10, 10 July 2008 (UTC)

Maybe. I think you still need some rebar. Setting it up so it stays in place, but in the middle, is a bit tricky but probably there is a way. Vincecate 18:57, 28 August 2008 (UTC)

I think HDPE plastic could really work for this. A ball is a strong shape. They use the plastic for kayaks and some small boats. It is heavier than fiberglass but really tough. With some "carbon black" in it the sun does not bother it. Vincecate 18:57, 28 August 2008 (UTC)

Question: how do you measure absolute acceleration of the models, in the video ? The technique seems great for simulating rotational stability against waves, but not for simulating the heaving and bobbing that might be felt on the inside.--Jesrad 10:39, 1 September 2008 (UTC)

I agree. I can compare sideways acceleration between models by the angle the red water is slanted at. Also, if the water were at 45 degrees that would be 1 G acceleration to the side and I believe that scales to 1 G at the full sized. Or another way, a similar thing of water on a full sized version would slant about the same. So we can sort of measure felt sideways accelerations. But it really mixes in with the up/down accelerations too. So it is not very accurate. If you know of a better way please let me know. Vincecate 14:04, 1 September 2008 (UTC)