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Is there any other way?

N

ngdbud

Jan 1, 1970
0
Just a quick question. Are there any other methods of propulsin that
come from electricity other than electromagnetic (like in motors), ion,
or electrokinetic? None of them are incredibly effecient asfar as I
know, except for those lego dacta motors. You hook up one motor to the
other and spin one like a generator, the other will spin just about as
fast. Close to 100% effeciency. Now how to make them bigger?
 
I

Ian Stirling

Jan 1, 1970
0
ngdbud said:
Just a quick question. Are there any other methods of propulsin that
come from electricity other than electromagnetic (like in motors), ion,
or electrokinetic? None of them are incredibly effecient asfar as I
know, except for those lego dacta motors. You hook up one motor to the
other and spin one like a generator, the other will spin just about as
fast. Close to 100% effeciency. Now how to make them bigger?

Electrostatic, photon drive, and a few others.
Lego motors are not even close to 100%.
Do the numbers (torque*RPM) and I'd be surprised if it hit 70%.
Bigger motors do a lot better, up to very high 90%s.
Why?
 
D

Dirk Bruere at Neopax

Jan 1, 1970
0
ngdbud said:
Just a quick question. Are there any other methods of propulsin that
come from electricity other than electromagnetic (like in motors), ion,
or electrokinetic? None of them are incredibly effecient asfar as I
know, except for those lego dacta motors. You hook up one motor to the
other and spin one like a generator, the other will spin just about as
fast. Close to 100% effeciency. Now how to make them bigger?

http://www.hobbyspace.com/Links/LaunchPropulsion1.html

--
Dirk

The Consensus:-
The political party for the new millenium
http://www.theconsensus.org
 
E

ehsjr

Jan 1, 1970
0
John said:
I read in sci.electronics.design that John Fields



1.05 horse-power. So a 10 m diameter lens would be needed to provide 100
HP, about enough for a modern car.

Be a bitch to find a parking space. :)

Ed
 
D

doug dwyer

Jan 1, 1970
0
John Woodgate said:
No problem, just make it a 10 m diameter sphere, as in a sunshine
recorder. (;-)
A 1 acre field gathers sun energy over time and the horse yields the
energy with low efficiency aided by the manual labour of one individual.
Vast areas of land "over illuminated" could support panels with moisture
conserved underneath for growing .
Although by reciprocality It is not possible to focus a sun image with
higher surface temp than the sun surface (a mirror) I believe it can be
done if lenses of high refractive index are employed.
Ignore demon email address.
 
J

John Larkin

Jan 1, 1970
0
I read in sci.electronics.design that John Fields


1.05 horse-power. So a 10 m diameter lens would be needed to provide 100
HP, about enough for a modern car.

That would look funny on the top of your Volvo.

John
 
J

John Woodgate

Jan 1, 1970
0
I read in sci.electronics.design that John Larkin
That would look funny on the top of your Volvo.
It would look even funnier underneath it!
 
R

Rich Grise

Jan 1, 1970
0
A 1 acre field gathers sun energy over time and the horse yields the
energy with low efficiency aided by the manual labour of one individual.
Vast areas of land "over illuminated" could support panels with moisture
conserved underneath for growing .
Although by reciprocality It is not possible to focus a sun image with
higher surface temp than the sun surface (a mirror) I believe it can be
done if lenses of high refractive index are employed.
Ignore demon email address.

What, 6,000 C isn't enough? ;-)

Cheers!
Rich
 
N

ngdbud

Jan 1, 1970
0
Youre going to have to check my math, but I once calculated the amount
of power generated by one acre of sun light (based on contradictory
information) and It came out to near 8 megawatts
 
J

John Larkin

Jan 1, 1970
0
Just a quick question. Are there any other methods of propulsin that
come from electricity other than electromagnetic (like in motors), ion,
or electrokinetic?

Use electrolysis to split water into hydrogen and oxygen, and use them
to power a rocket. Don Lancaster can fill in the details.

John
 
R

Robert Latest

Jan 1, 1970
0
Youre going to have to check my math, but I once calculated the amount
of power generated by one acre of sun light (based on contradictory
information) and It came out to near 8 megawatts

The figure I once memorized was about 1kW/m^2 incident light
power on Earth. I don't know if that was with the sun in the
zenith (where the light has to penetrate the least thickness of
atmosphere).

That would come out as about 4MW/acre.

robert
 
P

Paul Burke

Jan 1, 1970
0
Robert said:
The figure I once memorized was about 1kW/m^2 incident light
power on Earth.

* cos( angle of sun).

Paul Burke
 
M

me

Jan 1, 1970
0
Use electrolysis to split water into hydrogen and oxygen, and use them
to power a rocket. Don Lancaster can fill in the details.

John

blah, blah, blah...
max power available x conversion efficiency = what you can do with it...
 
N

ngdbud

Jan 1, 1970
0
I must have multiplied wrong, that and I was going of 19 w/ft^2
(information I got out of a kids book). 5280 ft. per mile 64 acres per
mile^2, just tell me where I'm wrong. I wouldn't be suprised if none of
this 5280 ft. to a mile was right. this is all based off stuff i
learned in grade school and committed to memory (I am now 14 and a
freshmen).
 
J

John Woodgate

Jan 1, 1970
0
5280 ft. per mile
Yes.
64 acres per mile^2,

No, 640.

BTW, an acre is very close to 0.4 hectare, making a link with metric
measures. This is because hidden in Imperial land measure is the rod,
pole or perch of 5.5 yards, which is very close to 5 metres.
 
R

Richard Henry

Jan 1, 1970
0
John Woodgate said:
No, 640.

BTW, an acre is very close to 0.4 hectare, making a link with metric
measures. This is because hidden in Imperial land measure is the rod,
pole or perch of 5.5 yards, which is very close to 5 metres.

Link? I think coincidence.

along those "very close" lines:

Liter = quart

Yard = meter

Inch = 2.5 cm

Pound (mass) = 0.4 kilograms

Mile = 1.6 kilometers, which means kilometer = 0.6 miles, which means there
is some very close link to the golden ratio.
 
J

John Woodgate

Jan 1, 1970
0
I read in sci.electronics.design that Richard Henry <[email protected]>
Link? I think coincidence.

Please read the words. 'Link' is in the first sentence. The explanation
is in the second sentence and it is indeed a coincidence. The rod, pole
or perch is a very old unit, whereas the metre was invented after the
French Revolution and was intended to be one 40-millionth of the
circumference of the Great Circle through Paris.
along those "very close" lines:

Liter = quart

US quart, not Imperial.
Yard = meter

No, 0.9 m
Inch = 2.5 cm

Pound (mass) = 0.4 kilograms

No, 0.45 kg
Mile = 1.6 kilometers, which means kilometer = 0.6 miles, which means
there is some very close link to the golden ratio.

Coincidence again. See above for how the kilometre happened.
 
G

Guest

Jan 1, 1970
0
ngdbud said:
I must have multiplied wrong, that and I was going of 19 w/ft^2
(information I got out of a kids book). 5280 ft. per mile 64 acres per
mile^2, just tell me where I'm wrong. I wouldn't be suprised if none of
this 5280 ft. to a mile was right. this is all based off stuff i
learned in grade school and committed to memory (I am now 14 and a
freshmen).

640 acres/sq.mi.

Quick metric conversions:

A meter is 10% longer than a yard
A litre is 5% larger than a quart
a kilogram is 10% heavier than 2 lbs.
a hectare is 2.5 acres

Notice that in every case the corresponding metric unit is larger than the
English equivalent.

Norm Strong
 
T

The Cheese Machine

Jan 1, 1970
0
ngdbud said:
Just a quick question. Are there any other methods of propulsin that come
from electricity other than electromagnetic (like in motors), ion, or
electrokinetic?

Cattle prod?
 
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