User:Vincecate/Models/ShortCylinder

All of the models on this page are using at least one 5 gallon paint bucket (my "double bucket" version uses a second bucket to hold the ballast). The bucket weighs 4 lbs. I think it is like 11 inches diameter and 16 inches high but should measure it. Scaled up by 15 that is 23 feet diameter and 33 feet high. I use 20 lbs of steel weights for ballast.

Single bucket version with video shot from tripod on nearby pier.

<youtube v="ODw9kGQhfZ8" />

Same, as seen from the camera I am holding in the water.

<youtube v="Vyi67NwzS-8" />

This is the "double bucket" version which uses a second bucket underwater to hold the ballast. The lower bucket has much more drag than the weights alone, so does not move through the water so much (up/down/sideways). It also has more inertia since the mass of the water inside must be moved when the bucket moves. There are 4 ropes connecting the two buckets. Idea is the weights and ropes keep the bottom bucket upright and the 4 ropes keep the top bucket at the same orientation as the bottom bucket. Also, if we had slip-forms to make one concrete cylinder for the top, making a second for the bottom might not be too costly. This seems to work better than simple 20 lbs ballast.

<youtube v="vX2vPIygBok" />

Double bucket with weight on top (I think 5 lbs but maybe 2.5 lbs).

<youtube v="g3-FLqfP3rw" />

This next video shows the underwater view of a hanging ballast experiment. This is with 2 steel weights of 10 lbs each.

<youtube v="6dL4gd1o7rw" />

This video shows some dry land testing. First I just swing it like it swung in the water. Next we balance it on a bar and see how much weight on a side it takes to tip it. Then we try 4 separate 5 lbs weights (so same total of 20 lbs). This is not stable at all and can not even balance the bucket.

<youtube v="zqSjDemhT7g" />