Difference between revisions of "User:Vincecate/Models/ShortCylinder"
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| − | 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. | + | |
| + | == Model details == | ||
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| + | 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. The bucket is 10.5 inches at the bottom, 11 inches diameter at the top, and the lid is 12 inches across. The bucket is 14 inches long. I use 20 lbs of steel weights for ballast. | ||
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| + | == Full scale size == | ||
| + | |||
| + | Scaling 11 inch diameter by 14 inches at 1:25 scale factor gets to 23 feet diameter and 29 feet high. If the inside was 22 feet across then each floor would be 11*22*pi=380 sq-feet. If there are 3 floors inside that is 1140 sq-feet. This is really huge compared to the average live-aboard boat and even more space than many multi-million dollar yachts. | ||
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| + | ==Videos of experiments== | ||
Single bucket version with video shot from tripod on nearby pier. | Single bucket version with video shot from tripod on nearby pier. | ||
Revision as of 13:57, 7 August 2008
Model details
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. The bucket is 10.5 inches at the bottom, 11 inches diameter at the top, and the lid is 12 inches across. The bucket is 14 inches long. I use 20 lbs of steel weights for ballast.
Full scale size
Scaling 11 inch diameter by 14 inches at 1:25 scale factor gets to 23 feet diameter and 29 feet high. If the inside was 22 feet across then each floor would be 11*22*pi=380 sq-feet. If there are 3 floors inside that is 1140 sq-feet. This is really huge compared to the average live-aboard boat and even more space than many multi-million dollar yachts.
Videos of experiments
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" />
