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# Large Scale Catamarans

Circular hull's applied to very large scale Catamarans.
 (+2, -3) [vote for, against]

I propose Large Scale Catamarans, based on a well- functioning 3 meter length prototype, which proved to be the lightest (35 kilogrammes), and the cheapest (700 \$\$\$'s), one person catamaran, yet.

The scale would be :

Length : Width : Diameter of hulls : Weight : Payload :

3,00 m 1,85 m 0,250 m 35 kg 120 kg 12 m 7 m 1,000 m 2240 kg 7680 kg 120 m 65 m 10,0 m 2240 ton 7680 ton 1200 m 680 m 100,0 m 2,24 Mt 7,68 Mt 12 km's 8 km's 1,0 km's 2,24 Gt 7,68 Gt

A 12 by 8 kilometers catamaran would serve as a new community, like an island state, (Monte Carlo, Hawaii, Cuba), holding appartments in the hulls, and say 4 squares of entertainment stadiums in the 6 by 6 kilometer platform.

The entire top surface would be covered by transparent photo voltaic cells, yielding the current and voltage for the consumbtion aboard.

 — sirau, May 28 2011

Project Habakkuk http://en.wikipedia...ki/Project_Habakkuk
Similar [8th of 7, May 28 2011]

other types of YACHT/ISLAND combo's,...,. http://youtu.be/d98u3jr47Fc
comparing to a James Bond film's villan's lair,..,.,..,. [sirau, Jun 18 2012]

Project Blueseed - http://www.huffingt...-ent_n_1153300.html
The latest island being built [MisterQED, Jun 18 2012]

// like an island state, (Monte Carlo//
Interesting take on geography.
 — AbsintheWithoutLeave, May 28 2011

How do things scale? What about waves? How big would hydrodynamic and wind forces be? Would it run agound? And everything else?
 — MaxwellBuchanan, May 28 2011

 - 'Killer' waves are said to be 100 meters from top to bottom, (and travelling at 100 kms/hour !!).

 The immersion would be circa 300 meters, 100 meters splash and up and down zone, 200 meters free air under platform, 400 meters height of platform volume.

A re-think of Stadiums : a central, main stadium, of 3 by 3 kilometers, surrounded by a rim of 1 by 1 individual smaller stadiums.
 — sirau, May 28 2011

 Hulls could be made concrete shell elements, 25 by 25 meters, 1 meter thick, with some internal shapes for ribs.

For upper elements : also 25 x25, but hardened glass centres.
 — sirau, May 28 2011

 The Catamaran would stay in the open oceans, and serve as a station for regular cruise ships.

 Many diverse events would be staged, every day changing in each stadium.

 Even motorsport racing events could be held, in the central arena : Formula One/NASCAR/Indy- racing, Monster Trucks, Moto-Cross.

In the smaller venues : Anastacia, Theatre, Opera, etc.
 — sirau, May 28 2011

you can't just make something the same aspect ratio but much larger and expect it to have the same strength. In this house we obey the laws of physics!
 — Voice, May 28 2011

So this is like an oil-drilling platform minus the actual oil drilling ?
 — FlyingToaster, May 28 2011

 Not without precedent.

 — 8th of 7, May 28 2011

I think oil drilling platforms are usually less than 12x8km in size, and stand on legs resting on the sea floor rather than being free floating. Apart from that, yes, almost identical.
 — pocmloc, May 28 2011

I didn't pretend to have made any strength calculus, just a quick pre-view of just one solution.
 — sirau, May 28 2011

Certainly interesting reading, the Habakkuk stories. Thanks for sharing.
 — sirau, May 28 2011

//stand on legs resting on the sea floor// Nope, not always. Unlike a man's legs, in Abraham Lincoln's famous phrase, the legs of an oil platform don't always reach the ground.
 — mouseposture, May 28 2011

if you are going to work on this scale try one of Buckminster Fullers cloud nines. and float through the air
 — j paul, May 29 2011

Thanks [MP], I'll just pretend that //usually// refers to all the clauses following, not just the first.
 — pocmloc, May 29 2011

- joined The Buckminster Fuller Institute on Facebook. Thanks for the reference.
 — sirau, May 29 2011

 Unfortunately there's a law in Engineering known as the 'square cube law' - this is why an ant can lift many times it's own weight (despite being thin and spindly), but an elephant (despite being chunky) will break most of it's bones if it falls much more than it's own height.

 The best way to explain it is if you imagine building a tower - the weight pressing down is proportional to the volume (double the size and you 2 x 2 x 2 = 8x the mass) while the area it's pressing down on only 2 x 2 = 4x, so the stress, of force per unit area doubles! The natural frequencies (speed things vibrate at) also reduce as you scale things, which also causes issues.

The concept of a large, floating space capable of supporting a community sounds cool, but you can't just scale things - physics gets in the way! Different construction method required, but a nice idea.
 — Skrewloose, May 30 2011

 hi,

 the scale is purely meant as a 'spectrum' of outside dimensions.

 the weights are scaled in the third power, ie a factor of 10 in lengths, gives a factor of 1000 in volume/weight.

 The prototype was 2 mm's thick PVC ventilation pipe, which was filled with PUR foam (30 grammes per liter).

 The larger constructions can be more intricate, detailed and refined.

 (If the Eiffel tower of Paris, France, was scaled to height of 28 cm's, it would weigh only 30 grammes,..).

 Anyway, a scaled submersed pipe, follows the same proportional pressure/stress profiles (possibly with an adjustment for 300 meters submersed depth, pressure 3000 atm (!)).

 A 2 mm pipe thickness of a 3 meter cat, scales directly to 0,002 x 4 x 10 x 10 x 10 := 8 meters wall thickness PVC of a largest cat.

 And PVC isn't so strong as concrete, therefore : 1 meter.

Just a jab at a dimension, no real calculus.
 — sirau, May 30 2011

I guess this would be a good solution for Project Blueseed. (link)
 — MisterQED, Jun 18 2012

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