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Propeller or jet to push an in-line skater?



 
 
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  #1  
Old July 22nd 10, 01:57 AM posted to rec.aviation.military,rec.aviation.homebuilt
John Doe[_4_]
external usenet poster
 
Posts: 115
Default Propeller or jet to push an in-line skater?

How far-fetched is the idea, to use a propeller or jet engine
(radio controlled type?) to push an in-line skater? How does
aircraft takeoff thrust compare to using a conventional motor and
wheel to push oneself along the ground? What sort of incline would
be achievable at say a skater weight of about 160 pounds? I think
the rolling resistance can be assumed to be zero or maybe the same
as a small aircraft.

Anybody know about Everglades/marsh air powered boats? Maybe I
should do a little research on that one.

One thing for sure, if there ever is such a thing as a jetpack, it
will very easily push an in-line skater before it will lift a
person off of the ground.

Thanks.





--
(Crossposted, please feel free to remove the other group)
  #2  
Old July 22nd 10, 02:38 AM posted to rec.aviation.military,rec.aviation.homebuilt
Brian Whatcott
external usenet poster
 
Posts: 915
Default Propeller or jet to push an in-line skater?

On 7/21/2010 7:57 PM, John Doe wrote:
How far-fetched is the idea, to use a propeller or jet engine
(radio controlled type?) to push an in-line skater? How does
aircraft takeoff thrust compare to using a conventional motor and
wheel to push oneself along the ground? What sort of incline would
be achievable at say a skater weight of about 160 pounds? I think
the rolling resistance can be assumed to be zero or maybe the same
as a small aircraft.

Anybody know about Everglades/marsh air powered boats? Maybe I
should do a little research on that one.

One thing for sure, if there ever is such a thing as a jetpack, it
will very easily push an in-line skater before it will lift a
person off of the ground.

Thanks.





Jet thrust stays pretty constant with speed.
But Horse Power increases with speed for constant thrust.

Which is a fancy way of saying jets are inefficient at slow speeds,
but efficient at high speeds.
Anyway, think about 5 to 10 pounds of thrust per horse power at skating
speeds.

Brian W
  #3  
Old July 22nd 10, 04:14 AM posted to rec.aviation.military,rec.aviation.homebuilt
Orval Fairbairn[_2_]
external usenet poster
 
Posts: 530
Default Propeller or jet to push an in-line skater?

In article ,
brian whatcott wrote:

On 7/21/2010 7:57 PM, John Doe wrote:
How far-fetched is the idea, to use a propeller or jet engine
(radio controlled type?) to push an in-line skater? How does
aircraft takeoff thrust compare to using a conventional motor and
wheel to push oneself along the ground? What sort of incline would
be achievable at say a skater weight of about 160 pounds? I think
the rolling resistance can be assumed to be zero or maybe the same
as a small aircraft.

Anybody know about Everglades/marsh air powered boats? Maybe I
should do a little research on that one.

One thing for sure, if there ever is such a thing as a jetpack, it
will very easily push an in-line skater before it will lift a
person off of the ground.

Thanks.





Jet thrust stays pretty constant with speed.
But Horse Power increases with speed for constant thrust.

Which is a fancy way of saying jets are inefficient at slow speeds,
but efficient at high speeds.
Anyway, think about 5 to 10 pounds of thrust per horse power at skating
speeds.

Brian W


The model airplane guys have a very small (about 15" long, 5" dia)
turbojet that they use on scale jet R/C planes. It costs about $3000 US.

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  #4  
Old July 22nd 10, 04:31 AM posted to rec.aviation.military,rec.aviation.homebuilt
John Doe[_4_]
external usenet poster
 
Posts: 115
Default Propeller or jet to push an in-line skater?

Orval Fairbairn o_r_fairbairn earth_link.net wrote:

....

The model airplane guys have a very small (about 15" long, 5"
dia) turbojet that they use on scale jet R/C planes. It costs
about $3000 US.


How much for maintenance and fuel? Is it louder than a gas powered
weedeater? Just curious.
  #5  
Old July 22nd 10, 04:36 AM posted to rec.aviation.military,rec.aviation.homebuilt
cavelamb[_2_]
external usenet poster
 
Posts: 257
Default Propeller or jet to push an in-line skater?

John Doe wrote:
Orval Fairbairn o_r_fairbairn earth_link.net wrote:

...

The model airplane guys have a very small (about 15" long, 5"
dia) turbojet that they use on scale jet R/C planes. It costs
about $3000 US.


How much for maintenance and fuel?


It burns a quart of fuel in a minute or minute and a half.

Is it louder than a gas powered
weedeater? Just curious.


Deafening.

100,000 RPM with every harmonic ever invented.



--

Richard Lamb


  #6  
Old July 22nd 10, 04:51 AM posted to rec.aviation.military,rec.aviation.homebuilt
Dan[_12_]
external usenet poster
 
Posts: 451
Default Propeller or jet to push an in-line skater?

cavelamb wrote:
John Doe wrote:
Orval Fairbairn o_r_fairbairn earth_link.net wrote:
...
The model airplane guys have a very small (about 15" long, 5"
dia) turbojet that they use on scale jet R/C planes. It costs
about $3000 US.


How much for maintenance and fuel?


It burns a quart of fuel in a minute or minute and a half.

Is it louder than a gas powered
weedeater? Just curious.


Deafening.

100,000 RPM with every harmonic ever invented.


I think they missed the lower sub harmonics, but who can hear over
that racket?

Dan, U.S. Air Force, retired
  #7  
Old July 22nd 10, 04:59 AM posted to rec.aviation.military,rec.aviation.homebuilt
John Doe[_4_]
external usenet poster
 
Posts: 115
Default Propeller or jet to push an in-line skater?

Dan wrote:

cavelamb wrote:
John Doe wrote:
Orval Fairbairn o_r_fairbairn earth_link.net wrote:


The model airplane guys have a very small (about 15" long, 5"
dia) turbojet that they use on scale jet R/C planes. It costs
about $3000 US.

How much for maintenance and fuel?


It burns a quart of fuel in a minute or minute and a half.

Is it louder than a gas powered weedeater? Just curious.


Deafening.

100,000 RPM with every harmonic ever invented.


I think they missed the lower sub harmonics, but who can hear
over that racket?

Dan, U.S. Air Force, retired


http://www.youtube.com/watch?v=FxT5H...eature=related

Some backpack fan powered paragliding. Looks like so
much fun, but dangerous.





--
Thanks to the replies.
  #8  
Old July 22nd 10, 05:32 AM posted to rec.aviation.military,rec.aviation.homebuilt
Eunometic
external usenet poster
 
Posts: 65
Default Propeller or jet to push an in-line skater?

On Jul 22, 10:57*am, John Doe wrote:
How far-fetched is the idea, to use a propeller or jet engine
(radio controlled type?) to push an in-line skater?


Not far fetched, just very pointless.

Simply decide if you want digits chopped of by propellor or scorched
of by model jet engine after loosing control and suffering concusion.

It should be a few laughs if the dudsons peform it or jackass does it.


  #9  
Old July 22nd 10, 06:23 AM posted to rec.aviation.military,rec.aviation.homebuilt,free.UseNet
John Doe[_4_]
external usenet poster
 
Posts: 115
Default Propeller or jet to push an in-line skater?

Eunometic eunometic yahoo.com.au wrote:

John Doe j... usenetlove.invalid wrote:


How far-fetched is the idea, to use a propeller or jet engine
(radio controlled type?) to push an in-line skater?


Not far fetched, just very pointless.


Pointless, like Google Groups access to UseNet.

Simply decide if you want digits chopped of by propellor or
scorched of by model jet engine after loosing control and
suffering concusion.

It should be a few laughs if the dudsons peform it or jackass
does it.


Have you ever designed and built anything? Anything to show? No,
of course not. Because your imagination suffers.

In fact, it has been done (by a guy from Australia for one, BTW).
There are videos of others testing it there too.
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From: Eunometic eunometic yahoo.com.au
Newsgroups: rec.aviation.military,rec.aviation.homebuilt
Subject: Propeller or jet to push an in-line skater?
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  #10  
Old July 22nd 10, 12:13 PM posted to rec.aviation.military,rec.aviation.homebuilt
Garry O
external usenet poster
 
Posts: 27
Default Propeller or jet to push an in-line skater?

"John Doe" wrote in message
...
Dan wrote:

cavelamb wrote:
John Doe wrote:
Orval Fairbairn o_r_fairbairn earth_link.net wrote:


The model airplane guys have a very small (about 15" long, 5"
dia) turbojet that they use on scale jet R/C planes. It costs
about $3000 US.

How much for maintenance and fuel?

It burns a quart of fuel in a minute or minute and a half.

Is it louder than a gas powered weedeater? Just curious.

Deafening.

100,000 RPM with every harmonic ever invented.


I think they missed the lower sub harmonics, but who can hear
over that racket?

Dan, U.S. Air Force, retired


http://www.youtube.com/watch?v=FxT5H...eature=related

Some backpack fan powered paragliding. Looks like so
much fun, but dangerous.





--
Thanks to the replies.


I would imagine less dangerous than trying to in-line skate with one of
those things on :-)

--
Remember Altitude is more important than Attitude

 




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