Ellon Musk rocks.

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pete
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Ellon Musk rocks.

Post by pete » Sat Oct 19, 2013 8:39 am

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Dominic
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Re: Ellon Musk rocks.

Post by Dominic » Sat Oct 19, 2013 8:43 am

Awesome,... Although, far from expert, I'm not sure how the weight of the batteries will help the buoyancy.
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thinfourth
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Re: Ellon Musk rocks.

Post by thinfourth » Sat Oct 19, 2013 9:39 am

Dominic wrote:Awesome,... Although, far from expert, I'm not sure how the weight of the batteries will help the buoyancy.
Which would be a valid point if he was wanting something that floated :thumbsup
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Dominic
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Re: Ellon Musk rocks.

Post by Dominic » Sat Oct 19, 2013 9:43 am

thinfourth wrote:
Dominic wrote:Awesome,... Although, far from expert, I'm not sure how the weight of the batteries will help the buoyancy.
Which would be a valid point if he was wanting something that floated :thumbsup
Surely it needs to resurface at some point? :?
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robin
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Re: Ellon Musk rocks.

Post by robin » Sat Oct 19, 2013 10:01 am

Actually, he'll need the batteries as ballast to even sink in the first place.

Water has a density of 1,000 kg/m^3.

The car has approx 4x2x1 m dimesions = 8m^3. So to maintain neutral buoyancy you need a mass of 8,000kg. Let's say half the space is not air space, that still leaves 4,000kg to find. The original Esprit was only 1,200kg, ish, and even with all the stuff they'll need to brace it with to stop it bursting/leaking, you're still going to need ballast to reach the 4,000kg mark, I think.

Of course he could use thrust to achieve this instead, but then you cannot "hover" - you must be flying in order to force the vehicle down; if the engine cuts out, you'll resurface with little grace.

Oh, and 4,000 kg isn't going to make for an exciting sports car ;-)

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j2 lot
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Re: Ellon Musk rocks.

Post by j2 lot » Sat Oct 19, 2013 11:38 am

Fascinating that he is going to do it but I hope the original Esprit remains original and doesn't get hacked about and sunk in the process. :?
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jason
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Re: Ellon Musk rocks.

Post by jason » Sat Oct 19, 2013 1:24 pm

robin wrote:Actually, he'll need the batteries as ballast to even sink in the first place.

Water has a density of 1,000 kg/m^3.

The car has approx 4x2x1 m dimesions = 8m^3. So to maintain neutral buoyancy you need a mass of 8,000kg. Let's say half the space is not air space, that still leaves 4,000kg to find. The original Esprit was only 1,200kg, ish, and even with all the stuff they'll need to brace it with to stop it bursting/leaking, you're still going to need ballast to reach the 4,000kg mark, I think.

Of course he could use thrust to achieve this instead, but then you cannot "hover" - you must be flying in order to force the vehicle down; if the engine cuts out, you'll resurface with little grace.

Oh, and 4,000 kg isn't going to make for an exciting sports car ;-)

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...erm. Or use water ballast tanks, thus meaning it can still be an exciting sports car too :wink:

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robin
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Re: Ellon Musk rocks.

Post by robin » Sat Oct 19, 2013 4:32 pm

Pretty tough to use water as ballast 'cos water is just a dense as water - inherently neutral.

You can use water as buoyancy control ... but the passenger compartment will need to remain full of air. Even allowing for two humans sitting in the cabin it will still contain approximately 3m^3 of air. So you need to find 3,000kg to make that sink. The car has mass 1,200kg. You need something much denser than water to add the mass and not increase the volume of the vehicle (which is presumably the goal).

Actually the metal water tanks and the pumps/compressors needed to fill/empty them are probably pretty good ballast. As are the batteries. If it's going to be able to hover, it will need to be perfectly balanced which means tanks at the front and back (otherwise it will float nose up or nose down).

Anyway, the point I was making is that to you need to add ballast to a car to make it sink, or replace almost all the air with water.

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Re: Ellon Musk rocks.

Post by Sanjøy » Sat Oct 19, 2013 5:27 pm

No wonder the movie persona for iron man is based on him.
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