Topic: will these propulsion systems work in space?

[mrblasty]

If you fart in an empty elevator was it wasted?

That all depends on how much linger it has.  I've been known to fog an elevator to the point of criminality. 

[demon78]

Jesus! Blind Joe if you're seeing bubbles in an empty bathtub I'd change my diet, pretty quick.
Bill the demon.

[Industrial Cafe]

Wouldn't the motors rev up past their "purpose built" specs and burn out very quickly with no resistance on them?

could it burn out? there's no oxygen.... will it create heat with no friction? is there still electrical resistance in space?

[ColinMc]

What if you were able to hang your butt out in space, would a fart propel you?......

"sits back and eats popcorn.... "

Mick

Only if your fart was like this one



*sits back and toasts marshmallows*

[Inigo Montoya]

ouldn't the motors rev up past their "purpose built" specs and burn out very quickly with no resistance on them?
could it burn out? there's no oxygen.... will it create heat with no friction? is there still electrical resistance in space?

With no resistance, the fans would spin past their operational limits and kill the bearings or bushings. Possibly lose a few blades.

[mlinder]

Not necessarily. Rotational speed isn't defined by resistance, but by the number of oscillations per unit of time in the electromagnetic field.

[markb]

If you fart in an empty elevator was it wasted?

That all depends on how much linger it has.  I've been known to fog an elevator to the point of criminality. 

Is that why they call you mrblasty?

[Industrial Cafe]

Not necessarily. Rotational speed isn't defined by resistance, but by the number of oscillations per unit of time in the electromagnetic field.

and further more is there any resistance on the bearings causing friction?
 and the blades, is there centri#$%*le force on the blades in space?

[Inigo Montoya]

There is always resistance on rolling bearings. You always have 2 surfaces creating friction. I dont think there has been a bearing surface created with zero friction.
Also, the blades will ALWAYS have mass. All objects in space still have mass and if they are spinning, can still stress itself.
The space shuttle might be considered weightless but it still has its full mass.

Not necessarily. Rotational speed isn't defined by resistance, but by the number of oscillations per unit of time in the electromagnetic field.

The air being moved by the fan is resistance. If you remove that resistance, the fan could spin past the blade rating and fail. The motorts are rarely an issue as most of them are capable of spinning MUCH faster than the fan it self is able to.

[mlinder]

Again, the fan wont spin faster than the oscillations of the electromagnets. Does that mean it might spin faster than the bearings can handle? Sure. Does that mean they will? Absolutely not.

[Inigo Montoya]

yes or no. is the motor under more or less load when pushing blades thru the air? yes it is. as with any moving object, if you add resistance, it will slow down unless more power is added. if you keep the power equal and remove the resistance, the speed will increase to the driving components max speed. if a component is not capable of spinning that fast, it fails.

[Industrial Cafe]

but will it drive my 2 passenger space craft!

[mlinder]

yes or no. is the motor under more or less load when pushing blades thru the air? yes it is. as with any moving object, if you add resistance, it will slow down unless more power is added. if you keep the power equal and remove the resistance, the speed will increase to the driving components max speed. if a component is not capable of spinning that fast, it fails.

No, it will reach maximum speed as governed by the FREQUENCY of PULSES that are MOTIVATING it to TURN.

You are implying that in a vacuum, with frictionless bearings, the devices would reach infinite speed, assuming the thing didn't fly apart due to centripetal force.

Let's use an internal combustion engine instead of an electrical motor as reference. If the engine is spinning at 7000 rpm, and is connected to a fan, or paddles, or what the #$%* ever, the fans will reach the same speed in vacuum or not. Period.

If the potential speed of an electric motor is reached, it cannot go any #$%*ing faster.

[MötleyRöx]

Motors don't just keep ramping up speed till they are out of control.
Just as the current makes them spin, it also acts as a sort of engine brake, not allowing it to go faster.
A motor's max is not limited by the lack of resistance but by the resistance... if that makes sense.  If there is no resistance, then it will go only as fast as the current dictates.

[MötleyRöx]

but will it drive my 2 passenger space craft!

no, you would have to drive it... or sit #$%* while your monkey drives.

[Gordon]

If the potential speed of an electric motor is reached, it cannot go any #$%*ing faster.

Speaking of potential, I honestly didn't think this joke thread had the potential to turn into a true #$%*-fest, but there you have it!

Now let's see if the bait is taken....

[Gordon]

but will it drive my 2 passenger space craft!

no, you would have to drive it... or sit #$%* while your monkey drives.

"Sittin' #$%* while my monkey drives"

Great album name.

[mlinder]

If the potential speed of an electric motor is reached, it cannot go any #$%*ing faster.

Speaking of potential, I honestly didn't think this joke thread had the potential to turn into a true #$%*-fest, but there you have it!

Now let's see if the bait is taken....

#$%* you Gordon.

[mrblasty]

If you fart in an empty elevator was it wasted?

That all depends on how much linger it has.  I've been known to fog an elevator to the point of criminality. 

Is that why they call you mrblasty?

One of the reasons

[Markcb750]

Our science teachers must be beaming with pride.



This sucks or blows, me I prefer the former.


Did you all know a group from America tried to launch a solar sail recently, I think they piggybacked on a Russian ICBM test. It failed to reach orbit.


Arthur C. Clarke wrote a story "The Wind from the Sun" I read it as a young man, it would provide y'all with some basic propulsion theory, and it's a nice short story.


***I should reread my post

[Gordon]

If the potential speed of an electric motor is reached, it cannot go any #$%*ing faster.

Speaking of potential, I honestly didn't think this joke thread had the potential to turn into a true #$%*-fest, but there you have it!

Now let's see if the bait is taken....

#$%* you Gordon.

You're gonna have to try a lot harder than that!

[mlinder]

Our science teachers must be beaming with pride.



This is sucks or blows, me I prefer the former.


Did you all know a group from america tried to launch a solar sail recently, I think they piggybacked on a Russian ICBM test. It failed to reach orbit.


Arthur c. Clarke wrote a story "The Wind from the Sun" I read it as a younge man, it would provide y'all with some basic propulsion theory, and it a nice short story.

I think Mr. Kendall would be quite proud of me, Mark.

[Markcb750]

Hey Portland, I know Faith Fitch Hill would be proud of me.

I would be glad to assure Mr. Kendall he provided you with a sound foundation for critical thinking.

[mlinder]

Hey Portland, I know Faith Fitch Hill would be proud of me.

I would be glad to assure Mr. Kendall he provided you with a sound foundation for critical thinking.

I'll send you his email to let him know. Thanks Mark.

[Industrial Cafe]

what the hell just happened?