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Subject: Re: Ion drive for aircraft imminent.
Date: Mon, 7 Nov 2016 21:46:22 -0000
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In sci.physics Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:
> On 11/07/2016 01:37 PM, jimp@specsol.spam.sux.com wrote:
>> In sci.physics Robert Clark <rgregoryclark@gmspambloackail.com> wrote:
>> 
>> <snip>
>> 
>>> If you know of a means to provide 50,000 V at *lightweight* then you will 
>>> have solved the problem of an independently flying lifter, using the 
>>> macrosized wires currently used. You would need about a power to weight 
>>> ratio for the power source of better than 1 watt per gram, while being able 
>>> to provide these ca. 50,000 V voltages.
>>>
>>>  Bob Clark
>> 
>> Trivial; look at any camera flash unit built in the last several decades.
>> 
>> However you have totally missed the point; voltage and the weight of the
>> converter is irrelevant as it is the total power that determines the
>> weight of it all.
>> 
>> BTW, here are some real world power to weight ratios:
>> 
>> Boeing 777 engine 10 kW/kg
>  1985 Chevy Celebrity 300 W/kg <-- So for a 1000 kg car, that's 402
> horsepower?  Sign me up! ;)
> 
> Cheers
> 
> Phil Hobbs

No, that is the power to weight ratio of the engine, not the power to
weight ratio of the car.
 

-- 
Jim Pennino